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| Ribeiro,Rafael Vasconcelos; Santos,Mauro Guida dos; Pimentel,Carlos; Machado,Eduardo Caruso; Oliveira,Ricardo Ferraz de. |
| Low water availability and high temperatures occur under field conditions and we hypothesize that the critical temperature for photochemical damage (TC) in common bean (Phaseolus vulgaris L.) plants is increased by the occurrence of previous water deficit in a genotype-dependent manner. Five common bean cultivars A320, A222, Carioca, BAT477 and Ouro Negro were evaluated. Thirty days after seedlings emergence, one group of plants was exposed to water deficit for ten days and rehydrated and another one was maintained well hydrated during the experimental period. The minimum chlorophyll fluorescence (FO) was monitored in leaf discs exposed to temperatures ranging from 25 to 45 oC and the TC values estimated. The previous water deficit did not affect TC, which... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Chlorophyll fluorescence; Hardening; Heat stress; Phaseolus vulgaris; Tolerance. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052015000400374 |
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| Pimentel,Carlos; Ribeiro,Rafael Vasconcelos; Santos,Mauro Guida dos; Oliveira,Ricardo Ferraz de; Machado,Eduardo Caruso. |
| The objective of this study was to evaluate the effects of changes in the photosynthetic photon flux density (PPFD) on net gas exchange of Citrus limon, a woody species, and Nicotiana tabacum, an herbaceous species. When PPFD was increased from 50 to 350 mumol.m-2.s-1 and returned to 50 mumol.m-2.s-1 after 60 min, the CO2 assimilation rate (A) increased and stabilized after 15 min in both species. Stomatal conductance (g s), however, continued to increase. After returning to low PPFD, A immediately diminished to a low value for both lemon and tobacco. Stomatal conductance of lemon diminished slowly over 60 min, whereas g s for tobacco took only 15 min to decrease. This difference in behavior is probably due to over-sensitivity of stomata of woody species,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: CO2 assimilation rate; Gas exchange; Stomata; Intrinsic water use efficiency. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202004000200002 |
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| Ribeiro,Rafael Vasconcelos; Santos,Mauro Guida dos; Souza,Gustavo Maia; Machado,Eduardo Caruso; Oliveira,Ricardo Ferraz de; Angelocci,Luiz Roberto; Pimentel,Carlos. |
| Photosynthetic responses to daily environmental changes were studied in bean (Phaseolus vulgaris L.) genotypes 'Carioca', 'Ouro Negro', and Guarumbé. Light response curves of CO2 assimilation and stomatal conductance (g s) were also evaluated under controlled (optimum) environmental condition. Under this condition, CO2 assimilation of 'Carioca' was not saturated at 2,000 µmol m-2 s-1, whereas Guarumbé and 'Ouro Negro' exhibited different levels of light saturation. All genotypes showed dynamic photoinhibition and reversible increase in the minimum chlorophyll fluorescence yield under natural condition, as well as lower photosynthetic capacity when compared with optimum environmental condition. Since differences in g s were not observed between natural and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus vulgaris; Chlorophyll fluorescence; Gas exchange; Photosynthesis. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2004000700001 |
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| Santos,Mauro Guida dos; Ribeiro,Rafael Vasconcelos; Oliveira,Ricardo Ferraz de; Pimentel,Carlos. |
| This study was conducted to evaluate the effect of foliar Pi application on gas exchange and yield of bean genotypes submitted to a mild water deficit at the pre-flowering stage. In the first experiment, when extra Pi (10 g.L-1) was sprayed on leaves during water stress or during recovery, there was no effect on gas exchange or yield in the A320, Carioca and Ouro Negro genotypes. However, net CO2 assimilation (A) of A320 and Ouro Negro was less affected, but not significantly, than Carioca at the end of the stress, when Pi was supplied five days before water deficit. In the second experiment, two different doses of Pi (10 and 20 g.Pi L-1) were sprayed five days before water deficit on the Carioca genotype. During the last three days of the mild water... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Common bean; Inorganic phosphorus; Photosynthesis; Water deficit. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202004000300007 |
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| Moraes,Milton Ferreira de; Santos,Mauro Guida dos; Bermúdez-Zambrano,Oscar Darío; Malavolta,Marcelo; Raposo,Roberto Wagner Cavalcanti; Cabral,Cleusa Pereira; Malavolta,Eurípedes. |
| A granulometria e a solubilidade do fertilizante podem resultar em maior ou menor efeito da adubação. O objetivo deste trabalho foi comparar o efeito de um produto comercial granulado e moído de micronutrientes, com uma mistura de igual composição feita com materiais pró-análise. O delineamento experimental foi o inteiramente casualizado, utilizando três produtos com micronutrientes e quatro doses de cada mistura (0, 14, 28 e 56 mg dm-3), com quatro repetições. A maior produção de grãos é obtida com a aplicação do produto comercial em pó. A melhor correlação entre os materiais e teor na planta ocorre em razão do zinco. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Boro; Cobre; Manganês; Zinco; Arroz de sequeiro. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2004000600015 |
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