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	Provedor de dados PAB (3) Scientia Agricola (1) R. Bras. Zootec. (1) Autor Dias-Filho,Moacyr Bernardino (5) Caetano,Luana Pabla de Souza (1) Palavra-chave Photosynthesis (3) Amazonia (2) Biomass allocation (2) Ipomoea asarifolia (2) Stachytarpheta cayennensis (2) Adventitious roots (1) Allocation patterns (1) Brachiaria brizantha (1) Carbon assimilation (1) Chlorophyll content (1) Forage grasses (1) Growth analysis (1) Growth rate (1) Leaf elongation rate (1) Leaf nitrogen (1) Light compensation point (1) Pasture (1) Relative growth rate (1) Mais... Tipo do documento Info:eu-repo/semantics/article (5) Ano 2008 (1) 2002 (2) 1999 (2) País Brazil (5) Idioma Inglês (5)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 5 Primeira ... 1 ... Última Photosynthetic light response of the C4 grasses Brachiaria brizantha and B. humidicola under shade Scientia Agricola Dias-Filho,Moacyr Bernardino. Forage grasses in tropical pastures can be subjected to considerable diurnal and seasonal reductions in available light. To evaluate the physiological behavior of the tropical forage grasses Brachiaria brizantha cv. Marandu and B. humidicola to low light, the photosynthetic light response and chlorophyll contents of these species were compared for plants grown outdoors, on natural soil, in pots, in full sunlight and those shaded to 30 % of full sunlight, over a 30-day period. Both species showed the ability to adjust their photosynthetic behavior in response to shade. Photosynthetic capacity and light compensation point were lower for shade plants of both species, while apparent quantum yield was unaffected by the light regime. Dark respiration and... Tipo: Info:eu-repo/semantics/article Palavras-chave: Carbon assimilation; Chlorophyll content; Light compensation point; Pasture. Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100009 Physiological responses of two tropical weeds to shade: I. Growth and biomass allocation PAB Dias-Filho,Moacyr Bernardino. Ipomoea asarifolia (Desr.) Roem. & Schultz (Convolvulaceae) and Stachytarpheta cayennensis (Rich) Vahl. (Verbenaceae), two weeds found in pastures and crop areas in Brazilian Amazonia, were grown in controlled environment cabinets under high (800-1000 µmol m-² s-¹) and low (200-350 µmol m-² s-¹) light regimes during a 40-day period. For both species leaf dry mass and leaf area per total plant dry mass, and leaf area per leaf dry mass were higher for low-light plants, whereas root mass per total plant dry mass was higher for high-light plants. High-light S. cayennensis allocated significantly more biomass to reproductive tissue than low-light plants, suggesting a probably lower ability of this species to maintain itself under shaded conditions.... Tipo: Info:eu-repo/semantics/article Palavras-chave: Allocation patterns; Growth analysis; Amazonia; Ipomoea asarifolia; Stachytarpheta cayennensis. Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999000600004 Physiological responses of two tropical weeds to shade: II. Leaf gas exchange and nitrogen content PAB Dias-Filho,Moacyr Bernardino. Ipomoea asarifolia (Desr.) Roem. & Schultz (Convolvulaceae) and Stachytarpheta cayennensis (Rich) Vahl. (Verbenaceae), two weeds found in pastures and crop areas in the Brazilian Amazonia, Brazil, were grown in controlled environment cabinets under high (800-1000 µmol m-² s-¹) and low (200-350 µmol m-² s-¹) light regimes during a 40-day period. The objective was to determine the effect of shade on photosynthetic features and leaf nitrogen content of I. asarifolia and S. cayennensis. High-irradiance grown I. asarifolia leaves had significantly higher dark respiration and light saturated rates of photosynthesis than low-irradiance leaves. No significant differences for these traits, between treatments, were observed in S. cayennensis. Low-irradiance... Tipo: Info:eu-repo/semantics/article Palavras-chave: Photosynthesis; Leaf nitrogen; Amazonia; Ipomoea asarifolia; Stachytarpheta cayennensis. Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999000600005 Responses of six Brachiaria spp. accessions to root zone flooding R. Bras. Zootec. Caetano,Luana Pabla de Souza; Dias-Filho,Moacyr Bernardino. Some morphophysiological responses of Brachiaria brizantha cv. Marandu, cv. Piatã, cv. Arapoty, B163, B166 and B. ruziziensis R124 were compared in plants grown in pots, under flooded and well-drained conditions. Flooding reduced leaf elongation rate in all accessions. Leaf dry mass production was lower under flooding than in the control plants in all the studied accessions, except in cv. Piatã. Root dry mass production was reduced by flooding in cv. Marandu and in R124, while the proportion of biomass allocated to roots was reduced by flooding only in R124. It was not possible to detect significant differences between water regimes in the percentage of biomass allocated to culms and leaves for all accessions. Flooding decreased the number of tillers in... Tipo: Info:eu-repo/semantics/article Palavras-chave: Biomass allocation; Brachiaria brizantha; Leaf elongation rate; Photosynthesis; Relative growth rate. Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982008000500003 Tolerance to flooding in five Brachiaria brizantha accessions PAB Dias-Filho,Moacyr Bernardino. Some physiological and morphological responses of five Brachiaria brizantha accessions (BRA000591 cultivar Marandu, BRA003441, BRA002844, BRA004308 and BRA004391) were compared for plants grown in pots under flooding and well-drained conditions for 14 days. Flooding caused a significant reduction in leaf dry mass production in all accessions, but, for root biomass, no differences between treatments could be detected in BRA003441 and BRA004391. No adventitious root production was observed in flooded BRA003441; all other accessions produced adventitious roots when flooded. Relative growth rate was reduced by flooding only in BRA000591 and BRA004308. Leaf elongation rate was reduced by flooding in all accessions, however, more severely in BRA003441. Net... Tipo: Info:eu-repo/semantics/article Palavras-chave: Adventitious roots; Photosynthesis; Forage grasses; Biomass allocation; Growth rate. Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2002000400003 Registros recuperados: 5 Primeira ... 1 ... Última

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