Abstract:

Changes in the efficiency of the primary light energy conversion, fluorescence quenching parameters and contents of photosynthetic pigments were compared between two wheat (Triticum aestivum L.) genotypes in response to high light stress. The contents of chlorophyll and carotenoid in “Jing-411" were slightly higher than those in “Xiaoyan-54". Under high light stress, photoinhibition as indicated by a sustained decrease in PSⅡ photochemical efficiency was more pronounced in “Jing-411" than in “Xiaoyan-54". The content of ascorbate and the activity of the deepoxidase were higher in “Xiaoyan-54" than in “Jing-411". The genotypic difference in resistance to photoinhibition is related to the capacity to dissipate the excess energy nonradiatively. 

两个不同基因型小麦光抑制特性的比较
王肃威1  许长成1 白克智1 张其德1 李良璧1 匡廷云1* 李继云2  李振声3

（1. 中国科学院植物研究所光合作用基础研究开放实验室，北京100093；
2.  中国科学院生态研究中心，北京100085；3.  中国科学院遗传研究所，北京100101）

摘要：比较了两个不同基因型小麦(Triticum aestivum L.)"京411"和"小偃54"的原初光能转化效率、荧光猝灭参数和光合色素对强光胁迫的响应.在正常生长条件下"京411"的光合色素含量高于"小偃54";但在高光强下"京411"出现明显的光抑制,而"小偃54"对高光强的适应上优于"京411"."小偃54"适应高光强的原因是它在高光强下能大幅度地提高叶黄素循环的调控因子抗坏血酸的浓度及紫黄素脱环氧化酶(vDE)的活性,从而加速叶黄素循环对过多光能的耗散过程.

关键词： 光抑制；光合色素；叶黄素循环；小麦基因型

Key words: photoinhibition, photosynthetic pigments, xanthophyll cycle, wheat genotypes