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‣ Intercellular transport of epidermis-expressed MADS domain transcription factors and their effect on plant morphology and floral transition

URBANUS, Susan L.; MARTINELLI, Adriana P.; DINH, Q. D. (Peter); AIZZA, Lilian C. B.; DORNELAS, Marcelo C.; ANGENENT, Gerco C.; IMMINK, Richard G. H.
Fonte: WILEY-BLACKWELL Publicador: WILEY-BLACKWELL
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
46.97145%
P>During the lifetime of an angiosperm plant various important processes such as floral transition, specification of floral organ identity and floral determinacy, are controlled by members of the MADS domain transcription factor family. To investigate the possible non-cell-autonomous function of MADS domain proteins, we expressed GFP-tagged clones of AGAMOUS (AG), APETALA3 (AP3), PISTILLATA (PI) and SEPALLATA3 (SEP3) under the control of the MERISTEMLAYER1 promoter in Arabidopsis thaliana plants. Morphological analyses revealed that epidermal overexpression was sufficient for homeotic changes in floral organs, but that it did not result in early flowering or terminal flower phenotypes that are associated with constitutive overexpression of these proteins. Localisations of the tagged proteins in these plants were analysed with confocal laser scanning microscopy in leaf tissue, inflorescence meristems and floral meristems. We demonstrated that only AG is able to move via secondary plasmodesmata from the epidermal cell layer to the subepidermal cell layer in the floral meristem and to a lesser extent in the inflorescence meristem. To study the homeotic effects in more detail, the capacity of trafficking AG to complement the ag mutant phenotype was compared with the capacity of the non-inwards-moving AP3 protein to complement the ap3 mutant phenotype. While epidermal expression of AG gave full complementation...

‣ Evolutionary patterns in neotropical Helieae (Gentianaceae): evidence from morphology, chloroplast and nuclear DNA sequences

STRUWE, Lena; ALBERT, Victor A.; CALIO, M. Fernanda; FRASIER, Cynthia; LEPIS, Katherine B.; MATHEWS, Katherine G.; GRANT, Jason R.
Fonte: INT ASSOC PLANT TAXONOMY Publicador: INT ASSOC PLANT TAXONOMY
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
47.07539%
Parsimony-based phylogenetic analyses of the neotropical tribe Helieae (Gentianaceae) are presented, including 22 of the 23 genera and 60 species. This study is based on data from morphology, palynology, and seed micromorphology (127 structural characters), and DNA sequences (matK, trnL intron, ITS). Phylogenetic reconstructions based on ITS and morphology provided the greatest resolution, morphological data further helping to tentatively place several taxa for which DNA was not available (Celiantha, Lagenanthus, Rogersonanthus, Roraimaea, Senaea, Sipapoantha, Zonanthus). Celiantha, Prepusa and Senaea together appear as the sister clade to the rest of Helieae. The remainder of Helieae is largely divided into two large subclades, the Macrocarpaea subclade and the Symbolanthus subclade. The first subclade includes Macrocarpaea, sister to Chorisepalum, Tochia, and Zonanthus. Irlbachia and Neblinantha are placed as sisters to the Symbolanthus subclade, which includes Aripuana, Calolisianthus, Chelonanthus, Helia, Lagenanthus, Lehmanniella, Purdieanthus, Rogersonanthus, Roraimaea, Sipapoantha, and symbolanthus. Generic-level polyphyly is detected in Chelonanthus and Irlbachia. Evolution of morphological characters is discussed, and new pollen and seed characters are evaluated for the first time in a combined morphological-molecular phylogenetic analysis.; National Science Foundation (NSF)[317612]; U.S. National Science Foundation (NSF); Rutgers Research Council; Rutgers Research Council; Hatch-USDA; Hatch-USDA; The Cullman Program for Molecular Systematics Studies at The New York Botanical Garden; The Cullman Program for Molecular Systematics Studies at The New York Botanical Garden; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); FAPESP[03/10918-3]; IAPT Research Grant Program; IAPT Research Grant Program

‣ Studies of aberrant phyllotaxy1 Mutants of Maize Indicate Complex Interactions between Auxin and Cytokinin Signaling in the Shoot Apical Meristem

LEE, Byeong-ha; JOHNSTON, Robyn; YANG, Yan; GALLAVOTTI, Andrea; KOJIMA, Mikiko; TRAVENCOLO, Bruno A. N.; COSTA, Luciano da Fontoura; SAKAKIBARA, Hitoshi; JACKSON, David
Fonte: AMER SOC PLANT BIOLOGISTS Publicador: AMER SOC PLANT BIOLOGISTS
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
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One of the most fascinating aspects of plant morphology is the regular geometric arrangement of leaves and flowers, called phyllotaxy. The shoot apical meristem (SAM) determines these patterns, which vary depending on species and developmental stage. Auxin acts as an instructive signal in leaf initiation, and its transport has been implicated in phyllotaxy regulation in Arabidopsis (Arabidopsis thaliana). Altered phyllotactic patterns are observed in a maize (Zea mays) mutant, aberrant phyllotaxy1 (abph1, also known as abphyl1), and ABPH1 encodes a cytokinin-inducible type A response regulator, suggesting that cytokinin signals are also involved in the mechanism by which phyllotactic patterns are established. Therefore, we investigated the interaction between auxin and cytokinin signaling in phyllotaxy. Treatment of maize shoots with a polar auxin transport inhibitor, 1-naphthylphthalamic acid, strongly reduced ABPH1 expression, suggesting that auxin or its polar transport is required for ABPH1 expression. Immunolocalization of the PINFORMED1 (PIN1) polar auxin transporter revealed that PIN1 expression marks leaf primordia in maize, similarly to Arabidopsis. Interestingly, maize PIN1 expression at the incipient leaf primordium was greatly reduced in abph1 mutants. Consistently...

‣ Respostas morfofisiológicas do capim Tanzânia (Panicum maximum Jacq. cv. Tanzânia) irrigado à intensidade de desfolha sob lotação rotacionada.; Morphological and physiological responses of irrigated Tanzania grass (Panicum maximum Jacq. cv. Tanzania) to grazing intensity under rotational stocking.

Mello, Alexandre Carneiro Leão de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 07/06/2002 Português
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Os trabalhos de pesquisa não têm dado ênfase à importância das características morfológicas e fisiológicas relacionadas com a produtividade das plantas forrageiras tropicais sob pastejo. Existe a necessidade de se saber como o dossel forrageiro responde a regimes de desfolha, em termos de morfologia de plantas, estrutura do pasto, arquitetura do dossel e de processos fisiológicos como a fotossíntese, para que estratégias ótimas de colheita via pastejo sejam identificadas. O objetivo deste trabalho foi quantificar respostas morfológicas e fisiológicas de dosséis de capim Tanzânia (Panicum maximum Jacq. cv. Tanzânia) sob três intensidades de pastejo, sob lotação rotacionada e irrigação, procurando estabelecer relações causa-efeito não só entre as variáveis estudadas, mas também entre elas e a produção do pasto, medida como acúmulo de massa seca. O experimento foi conduzido na Fazenda Areão da USP/ESALQ, em Piracicaba, SP, em uma área de 4,8 ha de capim Tanzânia. Os tratamentos foram três intensidades de pastejo, aplicados como quantidades de matéria seca verde residual pós-pastejo (T1=1000; T2=2500 e T3=4000 kg MSV ha -1 ), em um delineamento experimental de blocos completos casualizados com quatro repetições. Durante oito ciclos de pastejo (rebrotas de 33 dias após três dias de pastejo em cada ciclo)...

‣ Populational diversity on leaf morphology of maté (Ilex paraguariensis A. St.-Hill., Aquifoliaceae)

Coelho, Geraldo Ceni; Mariath, Jorge Ernesto de Araujo; Schenkel, Eloir Paulo
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Artigo de Revista Científica Formato: application/pdf
Português
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Erva-mate (Ilex paraguariensis A. St.-Hil.) é uma planta nativa do Brasil, e matéria-prima para bebidas e chás. Analisou-se sua variabilidade populacional, comparando-se a morfologia das folhas de 3 diferentes populações do Mato Grosso do Sul (MS), Paraná (PR) e Santa Catarina (SC). Avaliou-se área (A), perímetro (P), comprimento (c), largura máxima (l) e biomassa (m), distância da largura máxima até a base (dl), ângulo basal da lâmina (Âb), e os índices: distância relativa da largura média (DLM = dl / l), razão comprimento/largura (RCL = c / l), perímetro relativo (PR = (c + l) / Pe), índice de área retangular (IAR = A / (c x l)) e massa específica (m/A). Há diferenças em A (MSSC) e m/A (MS>PR, PR=SC, MS=SC). O IAR menor de SC pôde ser explicado, pelo menos em parte, pela correlação entre IAR e Âb (r= 0,6043, p<0,01).; Maté (Ilex paraguariensis A. St.-Hil.) is a native plant from southern Brazil and a raw material for beverages. To research on population variability of the species, we compared leaf morphology of three populations from Mato Grosso do Sul (MS), Paraná (PR) and Santa Catarina (SC) States. Lamina measurements included area (A), perimeter (P)...

‣ Morfologia e ontogenese do pericarpo e da semente de Eugenia punicifolia (H. B. & K.) DC., Myrcia bella Camb. e Campomanesia pubescens (DC.) Berg (Myrtaceae); Morphology and anatomy of the pericarp and sees of Eugenia punicifolia (H. B. & K.) DC., Myrcia bella Camb. and Campomanesia pubescens (DC.) Berg (Myrtaceae)

Inara Regiane Moreira-Coneglian
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 02/05/2007 Português
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O cerrado vem sendo destruído e os aspectos estruturais de suas plantas são pouco conhecidos perante sua diversidade. A maioria das espécies nativas de Myrtaceae, uma das mais representativas da flora brasileira e dos cerrados, não possui estudos de suas estruturas reprodutivas; as análises de frutos e sementes de membros desta família limitam-se a espécies de interesse econômico e raramente envolvem aspectos anatômicos e ontogenéticos. Este trabalho objetiva detalhar a morfologia e ontogênese dos frutos e sementes de Eugenia punicifolia, Myrcia bella e Campomanesia pubescens, espécies comumente encontradas no cerrado sensu lato, comparando-as. O material foi processado seguindo técnicas anatômicas usuais para inclusão em resina plástica. Nas três espécies, tanto na parede ovariana quanto no pericarpo, destaca-se a região fundamental, dividida em três áreas, a grande freqüência de células com conteúdo fenólico e a presença de cavidades secretoras com conteúdo lipídico. Os óvulos são campilótropos; em E. punicifolia, a calaza é extensa e há hipóstase; nas outras espécies, a calaza é menos extensa e não observa-se hipóstase. Durante o desenvolvimento dos frutos, há, inicialmente, intensa atividade mitótica em todas as regiões dos frutos. Formam-se espaços intercelulares no mesocarpo de E. punicifolia e M. bella; em C. pubescens...

‣ Intercellular transport of epidermis-expressed MADS domain transcription factors and their effect on plant morphology and floral transition

URBANUS, Susan L.; MARTINELLI, Adriana P.; DINH, Q. D. (Peter); AIZZA, Lilian C. B.; DORNELAS, Marcelo C.; ANGENENT, Gerco C.; IMMINK, Richard G. H.
Fonte: WILEY-BLACKWELL Publicador: WILEY-BLACKWELL
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
46.848125%
P>During the lifetime of an angiosperm plant various important processes such as floral transition, specification of floral organ identity and floral determinacy, are controlled by members of the MADS domain transcription factor family. To investigate the possible non-cell-autonomous function of MADS domain proteins, we expressed GFP-tagged clones of AGAMOUS (AG), APETALA3 (AP3), PISTILLATA (PI) and SEPALLATA3 (SEP3) under the control of the MERISTEMLAYER1 promoter in Arabidopsis thaliana plants. Morphological analyses revealed that epidermal overexpression was sufficient for homeotic changes in floral organs, but that it did not result in early flowering or terminal flower phenotypes that are associated with constitutive overexpression of these proteins. Localisations of the tagged proteins in these plants were analysed with confocal laser scanning microscopy in leaf tissue, inflorescence meristems and floral meristems. We demonstrated that only AG is able to move via secondary plasmodesmata from the epidermal cell layer to the subepidermal cell layer in the floral meristem and to a lesser extent in the inflorescence meristem. To study the homeotic effects in more detail, the capacity of trafficking AG to complement the ag mutant phenotype was compared with the capacity of the non-inwards-moving AP3 protein to complement the ap3 mutant phenotype. While epidermal expression of AG gave full complementation...

‣ Populational Diversity on Leaf Morphology of Maté (Ilex paraguariensis A. St.-Hil., Aquifoliaceae)

Coelho,Geraldo Ceni; Mariath,Jorge Ernesto de Araujo; Schenkel,Eloir Paulo
Fonte: Instituto de Tecnologia do Paraná - Tecpar Publicador: Instituto de Tecnologia do Paraná - Tecpar
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2002 Português
Relevância na Pesquisa
47.07539%
Maté (Ilex paraguariensis A. St.-Hil.) is a native plant from southern Brazil and a raw material for beverages. To research on population variability of the species, we compared leaf morphology of three populations from Mato Grosso do Sul (MS), Paraná (PR) and Santa Catarina (SC) States. Lamina measurements included area (A), perimeter (P), length (l), maximum width (w), distance between maximum width and lamina base (dw), base angle (BÂ), biomass (m), and the indexes: relative distance of maximum width (dw/l), ratio length/width (l/w), relative perimeter (RP= P / (l + w), rectangular area index (RAI = A / (l x w)) and leaf mass/area (m/A). We verified differences among populations on A (MSSC) and m/A (MS>PR, MS=SC, PR=SC). The lowest RAI of SC could be explained, at least partially, by a positive correlation between RAI and BÂ (r= 0.6043, p<0.01).

‣ A Green Fluorescent Protein Fusion to Actin-Binding Domain 2 of Arabidopsis Fimbrin Highlights New Features of a Dynamic Actin Cytoskeleton in Live Plant Cells1[w]

Sheahan, Michael B.; Staiger, Chris J.; Rose, Ray J.; McCurdy, David W.
Fonte: American Society of Plant Biologists Publicador: American Society of Plant Biologists
Tipo: Artigo de Revista Científica
Publicado em /12/2004 Português
Relevância na Pesquisa
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The actin cytoskeleton coordinates numerous cellular processes required for plant development. The functions of this network are intricately linked to its dynamic arrangement, and thus progress in understanding how actin orchestrates cellular processes relies on critical evaluation of actin organization and turnover. To investigate the dynamic nature of the actin cytoskeleton, we used a fusion protein between green fluorescent protein (GFP) and the second actin-binding domain (fABD2) of Arabidopsis (Arabidopsis thaliana) fimbrin, AtFIM1. The GFP-fABD2 fusion protein labeled highly dynamic and dense actin networks in diverse species and cell types, revealing structural detail not seen with alternative labeling methods, such as the commonly used mouse talin GFP fusion (GFP-mTalin). Further, we show that expression of the GFP-fABD2 fusion protein in Arabidopsis, unlike GFP-mTalin, has no detectable adverse effects on plant morphology or development. Time-lapse confocal microscopy and fluorescence recovery after photobleaching analyses of the actin cytoskeleton labeled with GFP-fABD2 revealed that lateral-filament migration and sliding of individual actin filaments or bundles are processes that contribute to the dynamic and continually reorganizing nature of the actin scaffold. These new observations of the dynamic actin cytoskeleton in plant cells using GFP-fABD2 reveal the value of this probe for future investigations of how actin filaments coordinate cellular processes required for plant development.

‣ Developmental Genes Have Pleiotropic Effects on Plant Morphology and Source Capacity, Eventually Impacting on Seed Protein Content and Productivity in Pea1[W][OA]

Burstin, Judith; Marget, Pascal; Huart, Myriam; Moessner, Annie; Mangin, Brigitte; Duchene, Christiane; Desprez, Bruno; Munier-Jolain, Nathalie; Duc, Gérard
Fonte: American Society of Plant Biologists Publicador: American Society of Plant Biologists
Tipo: Artigo de Revista Científica
Publicado em /06/2007 Português
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Increasing pea (Pisum sativum) seed nutritional value and particularly seed protein content, while maintaining yield, is an important challenge for further development of this crop. Seed protein content and yield are complex and unstable traits, integrating all the processes occurring during the plant life cycle. During filling, seeds are the main sink to which assimilates are preferentially allocated at the expense of vegetative organs. Nitrogen seed demand is satisfied partly by nitrogen acquired by the roots, but also by nitrogen remobilized from vegetative organs. In this study, we evaluated the respective roles of nitrogen source capacity and sink strength in the genetic variability of seed protein content and yield. We showed in eight genotypes of diverse origins that both the maximal rate of nitrogen accumulation in the seeds and nitrogen source capacity varied among genotypes. Then, to identify the genetic factors responsible for seed protein content and yield variation, we searched for quantitative trait loci (QTL) for seed traits and for indicators of sink strength and source nitrogen capacity. We detected 261 QTL across five environments for all traits measured. Most QTL for seed and plant traits mapped in clusters, raising the possibility of common underlying processes and candidate genes. In most environments...

‣ LITTLE NUCLEI Genes Affecting Nuclear Morphology in Arabidopsis thaliana[W]

Dittmer, Travis A.; Stacey, Nicola J.; Sugimoto-Shirasu, Keiko; Richards, Eric J.
Fonte: American Society of Plant Biologists Publicador: American Society of Plant Biologists
Tipo: Artigo de Revista Científica
Publicado em /09/2007 Português
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Efforts to understand nuclear organization in plant cells have received little assistance from the better-studied animal nuclei, because plant proteomes do not contain recognizable counterparts to the key animal proteins involved in nuclear organization, such as lamin nuclear intermediate filament proteins. Previous studies identified a plant-specific insoluble nuclear protein in carrot (Daucus carota), called Nuclear Matrix Constituent Protein1 (NMCP1), which contains extensive coiled-coil domains and localizes to the nuclear periphery. Here, we describe a genetic characterization of two NMCP1-related nuclear proteins in Arabidopsis thaliana, LITTLE NUCLEI1 (LINC1) and LINC2. Disruption of either gene caused a reduction in nuclear size and altered nuclear morphology. Moreover, combining linc1 and linc2 mutations had an additive effect on nuclear size and morphology but a synergistic effect on chromocenter number (reduction) and whole-plant morphology (dwarfing). The reduction in nuclear size in the linc1 linc2 double mutant was not accompanied by a corresponding change in endopolyploidy. Rather, the density of DNA packaging at all endopolyploid levels in the linc1 linc2 mutants was increased significantly. Our results indicate that the LINC coiled-coil proteins are important determinants of plant nuclear structure.

‣ The Alteration of Plant Morphology by Small Peptides Released from the Proteolytic Processing of the Bacterial Peptide TENGU1[W]

Sugawara, Kyoko; Honma, Youhei; Komatsu, Ken; Himeno, Misako; Oshima, Kenro; Namba, Shigetou
Fonte: American Society of Plant Biologists Publicador: American Society of Plant Biologists
Tipo: Artigo de Revista Científica
Português
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A bacterial peptide effector undergoes proteolytic processing in plants and releases small peptides that alter plant morphology.

‣ Histone Deacetylase Complex1 Expression Level Titrates Plant Growth and Abscisic Acid Sensitivity in Arabidopsis[C][W][OPEN]

Perrella, Giorgio; Lopez-Vernaza, Manuel A.; Carr, Craig; Sani, Emanuela; Gosselé, Veronique; Verduyn, Christoph; Kellermeier, Fabian; Hannah, Matthew A.; Amtmann, Anna
Fonte: American Society of Plant Biologists Publicador: American Society of Plant Biologists
Tipo: Artigo de Revista Científica
Português
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Chemical modification of histones alters DNA structure and regulates gene expression. We have identified the Histone Deacetylase Complex (HDC) 1 protein as a component of chromatin in plants required for histone deacetylation and for induction of stress-inducible genes. HDC1-overexpression improves germination and plant growth without affecting plant morphology.

‣ A high-sensitivity optical device for the early monitoring of plant pathogen attack via the in vivo detection of ROS bursts

Zeng, Lizhang; Zhou, Jun; Li, Bo; Xing, Da
Fonte: Frontiers Media S.A. Publicador: Frontiers Media S.A.
Tipo: Artigo de Revista Científica
Publicado em 26/02/2015 Português
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Biotic stressors, especially pathogenic microorganisms, are rather difficult to detect. In plants, one of the earliest cellular responses following pathogen infection is the production of reactive oxygen species (ROS). In this study, a novel optical device for the early monitoring of Pseudomonas attack was developed; this device measures the ROS level via oxidation-sensitive 2′, 7′-dichlorodihydrofluorescein diacetate (H2DCFDA)-mediated fluorescence, which could provide early monitoring of attacks by a range of plant pathogen; ROS bursts were detected in vivo in Arabidopsis thaliana with higher sensitivity and accuracy than those of a commercial luminescence spectrophotometer. Additionally, the DCF fluorescence truly reflected early changes in the ROS level, as indicated by an evaluation of the H2O2 content and the tight association between the ROS and Pseudomonas concentration. Moreover, compared with traditional methods for detecting plant pathogen attacks based on physiological and biochemical measurements, our proposed technique also offers significant advantages, such as low cost, simplicity, convenient operation and quick turnaround. These results therefore suggest that the proposed optical device could be useful for the rapid monitoring of attacks by plant pathogen and yield results considerably earlier than the appearance of visual changes in plant morphology or growth.

‣ Experimental determination of effects of water depth on Nymphaea odorata growth, morphology and biomass allocation

Richards, Jennifer H.; Troxler-Gann, Tiffany; Lee, David W.; Zimmerman, Michael S.
Fonte: FIU Digital Commons Publicador: FIU Digital Commons
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
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Growth, morphology and biomass allocation in response to water depth was studied in white water lily,Nymphaea odorata Aiton. Plants were grown for 13 months in 30, 60 and 90 cm water in outdoor mesocosms in southern Florida. Water lily plant growth was distinctly seasonal with plants at all water levels producing more and larger leaves and more flowers in the warmer months. Plants in 30 cm water produced more but smaller and shorter-lived leaves than plants at 60 cm and 90 cm water levels. Although plants did not differ significantly in total biomass at harvest, plants in deeper water had significantly greater biomass allocated to leaves and roots, while plants in 30 cm water had significantly greater biomass allocated to rhizomes. Although lamina area and petiole length increased significantly with water level, lamina specific weight did not differ among water levels. Petiole specific weight increased significantly with increasing water level, implying a greater cost to tethering the larger laminae in deeper water. Lamina length and width scaled similarly at different water levels and modeled lamina area (LA) accurately (LAmodeled = 0.98LAmeasured + 3.96, R2 = 0.99). Lamina area was highly correlated with lamina weight (LW = 8.43LA − 66.78...

‣ Roles of Morphology, Anatomy, and Aquaporins in Determining Contrasting Hydraulic Behavior of Roots

Bramley, H.; Turner, N.; Turner, D.; Tyerman, S.
Fonte: Amer Soc Plant Physiologists Publicador: Amer Soc Plant Physiologists
Tipo: Artigo de Revista Científica
Publicado em //2009 Português
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The contrasting hydraulic properties of wheat (Triticum aestivum), narrow-leafed lupin (Lupinus angustifolius), and yellow lupin (Lupinus luteus) roots were identified by integrating measurements of water flow across different structural levels of organization with anatomy and modeling. Anatomy played a major role in root hydraulics, influencing axial conductance (L(ax)) and the distribution of water uptake along the root, with a more localized role for aquaporins (AQPs). Lupin roots had greater L(ax) than wheat roots, due to greater xylem development. L(ax) and root hydraulic conductance (L(r)) were related to each other, such that both variables increased with distance from the root tip in lupin roots. L(ax) and L(r) were constant with distance from the tip in wheat roots. Despite these contrasting behaviors, the hydraulic conductivity of root cells (Lp(c)) was similar for all species and increased from the root surface toward the endodermis. Lp(c) was largely controlled by AQPs, as demonstrated by dramatic reductions in Lp(c) by the AQP blocker mercury. Modeling the root as a series of concentric, cylindrical membranes, and the inhibition of AQP activity at the root level, indicated that water flow in lupin roots occurred primarily through the apoplast...

‣ Description of 90 inbred lines of castor plant (Ricinus communis L.)

Baldanzi, Marco; Myczkowski, Mirina Luiza; Salvini, Mariangela; Macchia, Mario
Fonte: Springer Publicador: Springer
Tipo: Artigo de Revista Científica Formato: 13-33
Português
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); The research describes the field comparison of 90 inbred lines of castor plant derived from both selected and wild germplasm. It was carried out in central-western Italy. An important aim of this work was to describe each inbred line based on 19 morphological traits concerning stem, leaves, racemes and capsules and then to suggest a list of descriptors to International Union for the Protection of New Varieties of Plants as to conduct the Distinctness, Uniformity and Stability test also on the castor plant. The plants in the field were grown at wide distances to avoid competition and enable observation of the growth habit, particularly the specific capacity of branching. An additional characterization of the inbred lines was obtained measuring 7 quantitative traits related to main stem and first raceme; the number of racemes per plant was used to quantify the plant branching. The results allowed distinguishing almost all the genotypes using only the morphological traits. Nectaries at the node, emergences on the stem and petioles, colour of nectaries on petiole resulted important plant descriptors. The two pairs of inbred lines (Tor87#9 vs. Tor87#83 and Pod87#255Hy2 vs. Rot95#55-23) were distinguished thanks to the quantitative traits. Based on the morphological traits...

‣ Morphology of arbuscular mycorrhizas in Tabebuia avellanedae Lorentz ex Griseb. (Bignoniaceae); Morfologia de micorrizas arbusculares em Tabebuia avellanedae Lorentz ex Griseb. (Bignoniaceae)

Paulilo, Maria Terezinha Silveira; Universidade Federal de Santa Catarina; Moratelli, Eliane Maria; Universidade Federal de Santa Catarina; Dalla Costa, Murilo; Universidade Federal de Santa Catarina; Santos, Marisa; Universidade Federal de Santa Catarina
Fonte: Universidade Federal de Santa Catarina Publicador: Universidade Federal de Santa Catarina
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; substrato de cultivo inoculado.; Substratum inoculated. Formato: application/pdf
Publicado em 01/01/2007 Português
Relevância na Pesquisa
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O conhecimento sobre o tipo de morfologia de micorrizas arbusculares é importante uma vez que a função fisiológica das estruturas micorrízicas e reações de defesa do hospedeiro podem apresentar diferenças entre as morfologias Arum e Paris. As raízes de plântulas de Tabebuia avellanedae, colonizadas tanto por população nativa presente no solo de mata utilizado no cultivo ou provindos de inoculação do solo de mata com Glomus clarum e Glomus tunicatum, apresentaram micorrizas arbusculares tanto com morfologia tipo Arum como morfologia tipo Paris, caracterizando uma morfologia do tipo intermediário. A presença de morfologia intermediária poderia ser ecologicamente vantajosa, pois traria aos hospedeiros os benefícios apresentados pelas morfologias Arum e Paris.; The knowledge about de morphology of arbuscular mycorrhizas is important since the physiological function of mycorrhizal structure and defense reactions of host can show differences between the Arum and Paris type morphology. Root seedlings of Tabebuia avellanedae, colonized both by native or inoculated (Glomus clarum and Glomus tunicatum) arbuscular mycorrhizal fungi showed both Arum and Paris type of morphology, characterizing an interrnediary type of morphology. This kind of morphology can bring ecological important since the hosts could take benefit of the advantages of each type of morphology.

‣ Contribuição ao estudo morfológico e anatômico das domácias em espécies de Ocotea Aubl.(Lauraceae) da Região Sul do Brasil; Contribution to morphology and anatomy study of domatia in Ocotea Aubl. species (Lauraceae) from the South of Brazil

Santos, Marisa; Universidade Federal de Santa Catarina; Almeida, Sérgio Luiz de
Fonte: Universidade Federal de Santa Catarina Publicador: Universidade Federal de Santa Catarina
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; Formato: application/pdf
Publicado em 01/01/1995 Português
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Este trabalho abrange a observação de folhas em 14 espécies de Ocotea Aubl., ocorrentes nos três Estados do Sul do Brasil (Rio Grande do Sul, Paraná e Santa Catarina), visando o estudo das domácias, quando presentes. Em 5 espécies, não foi encontrada nenhuma domácia. As características morfológicas e anatômicas das domácias em 9 espécies são apresentadas e discutidas. Quanto à estrutura externa, foram encontrados diferentes tipos de domácias, mas na maioria dos casos verificou-se que não são exclusivos de uma espécie. Entretanto, os aspectos da estrutura externa, reunidos com os da estrutura interna, podem contribuir para o reconhecimento destas espécies.; This paper includes the observation of leaves in 14 Ocolea Aubl. species, occurring in three States in the South of Brazil (Rio Grande do Sul, Paraná and Santa Catarina), in order to the study domatia, when these are present. In 5 species, there aren't any domatia. The morphology and anatomy aspects of domatia in 9 species are showed and discussed. With regard to outside structure, it was found distinct domatia pattern, but in the majority of the cases it exclusive for one species. However, aspects of the outside structure, together with aspects of the inside structure may contribute to the recognition ofthese species.

‣ Morfologia e distribuição de Caloneis, Lyrella, Moreneis, Petroneis e Pinnularia em praias arenosas de Santa Catarina, Sul do Brasil; Morphology and distribution of Caloneis, Lyrella, Moreneis, Petroneis and Pinnularia in sandy beaches of Santa Catarina, Southern Brazil

Garcia, Marinês; Universidade Federal de Pelotas, Pelotas, RS; Poncet, Gabriela Marques Fernandes; Rodrigues, Lissane Borges Valério
Fonte: Universidade Federal de Santa Catarina Publicador: Universidade Federal de Santa Catarina
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; Formato: application/pdf
Publicado em 24/12/2012 Português
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http://dx.doi.org/10.5007/2178-4574.2012n41p05 A morfologia e a distribuição de espécies dos gênerosCaloneis, Lyrella, Moreneis, Petroneis e Pinnularia foram estudadas em 20 praias arenosas do litoral do Estado de Santa Catarina, Brasil. A variabilidade morfológica observada para as espécies Caloneis africana, Lyrella abruptoides, Moreneis hexagona, Petroneis humerosa, Pinnularia neuquina e Pinnularia trevelyana foi semelhante à descrita na literatura. Todas as espécies estudadas apresentaram baixa frequência relativa de ocorrência e são os primeiros registros para o Estado de Santa Catarina. Dados de distribuição geográfica encontrados na literatura sugerem que C. africana e P. neuquina sejam espécies do Hemisfério Sul, enquanto P. trevelyana e P. humerosa são espécies cosmopolitas, assim como o gênero Moreneis. Lyrella abruptoides é uma espécie marinha e tropical. Considerando a distribuição nas praias estudadas, P. humerosa e C. africana ocorreram em todos os tipos de praia, L. abruptoides em uma baía, P. neuquina em praias intermediárias, enquanto M. hexagona e P. trevelyana ocorreram em praias dissipativas.; http://dx.doi.org/10.5007/2178-4574.2012n41p05 The morphology and distribution of Caloneis, Lyrella...