花后不同时期弱光和高温胁迫对小麦旗叶荧光特性及籽粒灌浆进程的影响

应用生态学报 ›› 2005, Vol. 16 ›› Issue (11): 2117-2121.

花后不同时期弱光和高温胁迫对小麦旗叶荧光特性及籽粒灌浆进程的影响

刘霞, 尹燕枰, 姜春明, 贺明荣, 王振林

山东农业大学农学院农业部小麦栽培生理与遗传改良重点开放实验室, 山东省作物生物学重点实验室, 泰安 271018

收稿日期:2002-10-12 修回日期:2003-02-28 出版日期:2005-11-15 发布日期:2005-11-15
通讯作者: 王振林
基金资助:
国家自然科学基金项目(30270781)、农业部农业结构调整重大技术研究项目(2003-02-05A)和山东省自然科学基金资助项目(Y2001D12).

Effects of weak light and high temperature stress after anthesis on flag leaf chlorophyll fluorescence and grain fill of wheat

LIU Xia, YIN Yanping, JIANG Chunming, HE Mingrong, WANG Zhenlin

Key Laboratory of Wheat Cultivation Physiology and Genetic Improvement of Agriculture Ministry, Crop Biology Laboratory of Shandong Province, College of Agronomy, Shandong Agricultural University, Taian 271018, China

Received:2002-10-12 Revised:2003-02-28 Online:2005-11-15 Published:2005-11-15

摘要/Abstract

摘要： 在田间试验条件下研究了花后不同时期弱光和高温胁迫对小麦旗叶荧光特性及籽粒灌浆进程的影响.结果表明,弱光处理3 d后,旗叶PSⅡ最大光化学效率(F_v/F_m)和光合速率(P_n)显著降低,但PSⅡ实际光化学效率(ФPSⅡ)、荧光光化学猝灭系数(qP)和非光化学猝灭(NPQ)与对照相比差异较小;高温处理3 d后,F_v/F_m、P_n、ФPSⅡ和qP均极显著降低,NPQ升高幅度较小.胁迫解除后,灌浆前期(花后8～10d)弱光和高温处理后的旗叶荧光参数和光合速率略有恢复,但灌浆中期(花后1～17 d)处理后的各参数始终呈下降趋势,说明前期处理效应是可逆的,而中期处理加速其衰老进程.用Logistic方程对各处理的籽粒灌浆过程模拟表明,弱光和高温处理后籽粒粒重的降低主要是平均灌浆速率、最大灌浆速率和渐增期灌浆速率显著降低所致.灌浆持续期、最大灌浆速率出现时间、缓增持续期和缓增期灌浆速率受弱光和高温影响较小.

关键词: 弱光, 高温, 荧光, 灌浆, 小麦

Abstract: A field experiment with wheat showed that after anthesis,the photosystemⅡ(PSⅡ),photochemical efficiency(F_v/F_m) and photosynthetic rate(P_n) of flag leaf decreased substantially,its actual quantum yield of PSⅡ electron transport(ΦPSⅡ) and photochemical quenching co-efficient(qP) declined slightly,while its non-photochemical quenching(NPQ) increased slightly three days after shading,compared with the control.Three days after high temperature treatment,the F_v/F_m、P_n、ФPSⅡand qP decreased significantly,while the NPQ increased slightly.During the course of recovery after the stresses,the parameters fluorescence and P_n which were stressed by shading and high temperature at prophase recovered slightly,while those stressed at metaphase decreased all along,indicating that the damage at prophase was reversible,but the stress at metaphase accelerated the caducity of flag leaves.The grain-filling processes of different treatments were modeled with Logistic equation,which showed that the decline of per kernel weight was mainly caused by the decrease of mean filling rate,maximal filling rate,and slowincrease period filling rate.Filling duration,occurrence time of maximal filling rate,duration of slight-increase period,and slight-increase period filling rate were less affected by weak light and high temperature.

Key words: Weak light, High temperature, Fluorescence characteristic, Grain fill, Wheat

中图分类号:

Q945.1

刘霞, 尹燕枰, 姜春明, 贺明荣, 王振林. 花后不同时期弱光和高温胁迫对小麦旗叶荧光特性及籽粒灌浆进程的影响[J]. 应用生态学报, 2005, 16(11): 2117-2121.

LIU Xia, YIN Yanping, JIANG Chunming, HE Mingrong, WANG Zhenlin . Effects of weak light and high temperature stress after anthesis on flag leaf chlorophyll fluorescence and grain fill of wheat[J]. Chinese Journal of Applied Ecology, 2005, 16(11): 2117-2121.

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