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索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2d用50~400μmol·L^-1水扬酸处理叶片,抑制了高温强光下原初光能转换效率(Fv/Fm)、光合电子传递量子效率(ФPSⅡ)、最大荧光(Fm)和光化学猝灭系数(qP)的下降,分别比对照提商,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(R)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.
In this study, cucumber leaves were under high temperature and strong light stress after two days of spraying with 50- 400μmol· L^-1 salicylic acid (SA) solution. The measurements showed that SA pretreatment could inhibit the decrease of intrinsic photochemical efficiency (Fv/Fm), quantum yield of PSⅡ(Ф9PSⅡ), maximum fluorescence value(Fro ), 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 (Fo). 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,
出处
《应用生态学报》
CAS
CSCD
北大核心
2006年第3期399-402,共4页
Chinese Journal of Applied Ecology
基金
陕西省自然科学基金资助项目(2003C128).
关键词
黄瓜
水杨酸
高温
强光
叶绿素荧光
叶黄素循环
Cucumber, Salicylic acid, High temperature, Strong light, Chlorophyll fluorescence, Xanthophyll cycle.