叶绿素
向日葵
向日葵
化学
盐(化学)
叶绿素a
叶绿素荧光
降级(电信)
园艺
植物
生物
生物化学
电信
物理化学
计算机科学
标识
DOI:10.1016/j.scienta.2004.04.009
摘要
Helianthus annuus L. plants when exposed to increasing concentrations of NaCl showed a reduction of chlorophyll content and fluorescence (mainly due to a reduction of Fm). Chlorophyllase activity was higher in 15-day-old unstressed leaves. It increased during the first days in 25 mM NaCl stressed leaves decreasing with higher concentrations. NaCl effect on chlorophyll synthesis was then studied: only 50 and 100 mM NaCl inhibited synthesis of 5-aminolaevulinic acid, a precursor of chlorophyll. Our results show that: (1) chlorophyllase is stimulated during the first days in leaves under moderate stress but it is affected by high salt concentrations; (2) salt stress affects more drastically chlorophyll synthesis (decreasing ALA synthesis) than chlorophyllase-mediated degradation.
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