Análise fisiológica da senescência foliar de duas cultivares de arroz com diferentes potenciais de produtividade

Antelmo Ralph Falqueto; Daniela Cassol; Ariano Martins de Magalhães Júnior; Antônio Costa de Oliveira; Marcos Antonio Bacarin

doi:10.1590/S1678-3921.pab2009.v44.2160

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

Authors

Antelmo Ralph Falqueto Federal University of Espírito Santo
Daniela Cassol Federal University of Pelotas
Ariano Martins de Magalhães Júnior Embrapa Clima Temperado
Antônio Costa de Oliveira Federal University of Pelotas
Marcos Antonio Bacarin Federal University of Pelotas

DOI:

https://doi.org/10.1590/S1678-3921.pab2009.v44.2160

Keywords:

<i>Oryza sativa</i>, oxygen evolution rate, photochemical quenching, photosystem II, photochemicol efficiency, stay green

Abstract

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.

Author Biographies

Antelmo Ralph Falqueto, Federal University of Espírito Santo

Universidade Federal do Espírito Santo, Departamento de Ciências da Saúde, Biológicas e Agrárias, CEP 29933-415, São Mateus, ES.
Daniela Cassol, Federal University of Pelotas

Universidade Federal de Pelotas, Departamento de Botânica, Instituto de Biologia, CEP 96010-900, Pelotas, RS
Ariano Martins de Magalhães Júnior, Embrapa Clima Temperado

Embrapa Clima Temperado, CEP 96001970, Pelotas, RS
Antônio Costa de Oliveira, Federal University of Pelotas

Universidade Federal de Pelotas, Faculdade de Agronomia Eliseu Maciel, CEP 96010900, Pelotas, RS
Marcos Antonio Bacarin, Federal University of Pelotas

Universidade Federal de Pelotas, Departamento de Botânica, Instituto de Biologia, CEP 96010-900, Pelotas, RS

Downloads

PDF (Portuguese (Brazil))

Published

2010-11-18

Issue

v.44, n.7, jul. 2009

Section

PLANT PHYSIOLOGY

How to Cite

Falqueto, A. R., Cassol, D., Júnior, A. M. de M., Oliveira, A. C. de, & Bacarin, M. A. (2010). Physiological analysis of leaf senescence of two rice cultivars with different yield potential. Pesquisa Agropecuaria Brasileira, 44(7), 695-700. https://doi.org/10.1590/S1678-3921.pab2009.v44.2160

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