Data/hora: 11/06/2024 01:25:24

Provedor de dados: | 86
País: | Brazil
Título: | Physiological analysis of leaf senescence of two rice cultivars with different yield potential
Autores: | Falqueto,Antelmo Ralph; Cassol,Daniela; Magalhães Júnior,Ariano Martins de; Oliveira,Antônio Costa de; Bacarin,Marcos Antonio.
Data: | 2009-07-01
Ano: | 2009
Palavras-chave: | Oryza sativa; Oxygen evolution rate; Photochemical quenching; Photosystem II; Photochemicol efficiency; Stay green.
Resumo: | The objective of this work was to evaluate the physiological changes that occur in different leaves during the early and late grain-filling stages of two rice genotypes (Oryza sativa subsp. indica , BRS Pelota cultivar, and O. sativa subsp. japonica , BRS Firmeza cultivar), which present differences in grain yield potential. The plants were cultivated in greenhouse. Pigment content, chlorophyll fluorescence, electron transport and oxygen evolution rate were determined in the grain-filling stage, from the first to the forth leaf (top to bottom). Pigment content, photochemical efficiency of photosystem II and electron transport decreased significantly according to the position of leaves in 'BRS Pelota'. The BRS Firmeza cultivar shows higher pigment content and higher activity of the photosynthetic apparatus in comparison to 'BRS Pelota' during the grain-filling stage.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000700007

Editor:

Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira

Relação: | 10.1590/S0100-204X2009000700007
Formato: | text/html
Fonte: | Pesquisa Agropecuária Brasileira  v.44 n.7 2009
Fonte: | info:eu-repo/semantics/openAccess