Physiological analysis of leaf senescence of two rice cultivars with different yield potential

Pesquisa Agropecuária Brasileira

Antelmo Ralph Falqueto²  Daniela Cassol¹  Ariano Martins De Magalhães Júnior¹  Antônio Costa De Oliveira¹  Marcos Antonio Bacarin¹ 

[1] ,Universidade Federal do Espírito Santo Departamento de Ciências da Saúde, Biológicas e Agrárias São Mateus ES ,Brazil

关键词: Oryza sativa;    oxygen evolution rate;    photochemical quenching;    photosystem II;    photochemicol efficiency;    stay green;    Oryza sativa;    taxa de evolução de oxigênio;    extinção fotoquímica;    fotossistema II;    eficiência fotoquímica;    senescência retardada;   

DOI  :  10.1590/S0100-204X2009000700007

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
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