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Provedor de dados:  61
País:  Brazil
Título:  The chlorophyll a fluorescence as an indicator of the temperature stress in the leaves of Prunus persica
Autores:  Martinazzo,Emanuela Garbin
Ramm,Aline
Bacarin,Marcos Antonio
Data:  2012-12-01
Ano:  2012
Palavras-chave:  High temperature
Photosynthesis
Prunus persica
Resumo:  Plants growing in temperate regions are often exposed to stress conditions caused by high temperatures. Photosynthesis is one of the metabolic processes most sensitive to high temperature stress, and it is often inhibited before other cellular functions. Using peach leaf disks, we studied the transient chlorophyll a fluorescence along with the gas exchanges at temperatures of 25 (control) 30, 35, 40 and 45°C in the dark for a period of 30 minutes. Temperatures above 35°C caused significant changes in the transient fluorescence of chlorophyll a, including an increase in the initial fluorescence (F0), a decrease in maximum fluorescence values (F M) and the appearance of K and L bands. The values of the net assimilation rate decreased as the temperature increased and reached negative values at 45°C.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202012000400002
Editor:  Brazilian Journal of Plant Physiology
Relação:  10.1590/S1677-04202013005000001
Formato:  text/html
Fonte:  Brazilian Journal of Plant Physiology v.24 n.4 2012
Direitos:  info:eu-repo/semantics/openAccess
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