Autoria: FALQUETO, A. R.; CASSOL, D.; MAGALHAES JUNIOR, A. M. de; OLIVEIRA, A. C. de; BACARIN, M. A.

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.

Ano de publicação: 2009

Tipo de publicação: Artigo de periódico

Palavras-chave: Eficiência fotoquímica, Extinção fotoquímica, Fotossistema II, Oryza Sativa, Oxigênio, Oxygen evolution rate, Photochemical quenching, Photochemicol efficiency, Potencial de produtividade, Senescência, Senescência foliar de cultivares de arroz, Senescência retardada, Stay green, Taxa de evolução de oxigênio