高温强光下水杨酸对黄瓜叶片叶绿素荧光和叶黄素循环的影响

应用生态学报

高温强光下水杨酸对黄瓜叶片叶绿素荧光和叶黄素循环的影响

孙艳;徐伟君;范爱丽

西北农林科技大学园艺学院，杨凌 712100

收稿日期:2005-03-10 修回日期:2005-08-11 出版日期:2006-03-18 发布日期:2006-03-18

Effects of salicylic acid on chlorophyll fluorescence and xanthophyll cycle in cucumber leaves under high temperature and strong light

SUN Yan;XU Weijun;FAN Aili

College of Horticulture,Northwest Sci-Tech University of Agriculture and Forestry,Yangling 712100,China

Received:2005-03-10 Revised:2005-08-11 Online:2006-03-18 Published:2006-03-18

摘要/Abstract

摘要： 在高温强光条件下，研究了外源水杨酸对黄瓜叶片叶绿素荧光参数和叶黄素循环的影响.结果表明，在高温强光胁迫前2 d用50～400 μmol·L^-1水杨酸处理叶片，抑制了高温强光下原初光能转换效率(F_v/F_m)、光合电子传递量子效率(ΦPSⅡ)、最大荧光(F_m)和光化学猝灭系数(qP)的下降，分别比对照提高了16.1%～30.2%、11.9%～33.0%、7.2%～41.0%和27.2%～160.8%，促进了非光化学猝灭系数(NPQ)的升高，比对照提高了13.1%～62.9%，而对初始荧光(F_o)影响不大.水杨酸处理可减小高温强光下叶黄素循环库的下降幅度，使(A+Z)/(V+A+Z)升高，分别比对照高29.5%和24.6%.这些结果说明，水杨酸可通过提高非辐射能量耗散,对高温强光引起的黄瓜叶片光合机构的破坏具有保护作用.

Abstract: In this study,cucumber leaves were under high temperature and strong light stress after two days of spraying with 50～400 μmol·L^-1salicylic acid (SA) solution.The measurements showed that SA pretreatment could inhibit the decrease of intrinsic photochemical efficiency (F_v/F_m),quantum yield of PSII(ΦPSⅡ),maximum fluorescence value(F_m),and photochemical quenching (qP) by 16.1%～30.2%,11.9%～33.0%,7.2%～41.0% and 27.2%～160.8%,respectively,and promote the increase of non-photochemical quenching (NPQ) by 13.1%～62.9%,but had little effect on initial fluorescence value (F_o).SA pretreatment could also inhibit the decrease of xanthophyll cycle pool in cucumber leaves,and increase the deepoxidation extent of xanthophyll cycle (A+Z)/(V+A+Z),which was 29.5% and 24.6% higher than control,respectively.It was suggested that SA could protect the photosynthetic apparatus of cucumber leaves under high temperature and strong light through promoting non-radiative energy dissipation.

Key words: Immobilization, Degradation, Phenanthrene, Pyrene Soil

孙艳;徐伟君;范爱丽. 高温强光下水杨酸对黄瓜叶片叶绿素荧光和叶黄素循环的影响[J]. 应用生态学报.

SUN Yan;XU Weijun;FAN Aili. Effects of salicylic acid on chlorophyll fluorescence and xanthophyll cycle in cucumber leaves under high temperature and strong light[J]. Chinese Journal of Applied Ecology.