Details

Autor(en) / Beteiligte

• Sun Yan,Fan Aili,Xu Weijun

Titel

Effects of oxalate on photosynthetic apparatus and xanthophyll cycle in leaves of cucumber seedlings under high temperature stress

Ist Teil von

• Chung-kuo nung yeh kʿo hsüeh, 2005-09, Vol.38 (9)

Erscheinungsjahr

2005

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• 在40℃高温胁迫条件下，研究了外源草酸对黄瓜叶片光合作用、叶绿素荧光参数和叶黄素循环的影响。结果表明，在高温胁迫前3 d用5 mmoland#8226;L-1草酸处理叶片减小了高温胁迫下净光合速率（Pn）、蒸腾速率（Tr）、原初光能转换效率（Fv/Fm）、光合电子传递量子效率（φPSⅡ）、光化学猝灭系数（qP）和非光化学猝灭系数（NPQ）的下降幅度，而对气孔导度（Gs）没有影响。草酸处理可提高叶黄素循环库的大小和（A+Z）/（V+A+Z），并使高温胁迫下叶黄素循环库、叶绿素、类胡萝卜素含量的下降幅度和（A+Z）/（V+A+Z）在胁迫后期的下降幅度减小。这些结果说明，草酸对高温胁迫下黄瓜叶片光合机构的破坏具有保护作用。 Effects of exogenous oxalate on photosynthesis, chlorophyll fluorescence and xanthophyll cycle in cucumber leaves under high temperature stress at 40℃ were studied. The cucumber leaves were sprayed by 5 mmoland#8226;L-1 oxalate solution for 3 days before high temperature stress. The results showed that oxalate pretreatment alleviated the decreases of photosynthetic rate (Pn), transpiration rate (Tr), intrinsic photochemical efficiency (Fv/Fm), quantum yield of PSII (φPSⅡ), photochemical quenching (qP) and non-photochemical quenching (NPQ) by higher temperature, but has no effect on stomatal conductance (Gs) was observed. The xanthophyll cycle pool and (A+Z)/(V+A+Z) (the de-epoxidation extent of xanthop