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为了研究强光胁迫对小麦叶片光合作用及某些相关指标的影响，以18个冬小麦品种幼苗为材料，对室外自然光条件下生长的幼苗进行强光（1 500 μmol·m^-2·s^-1）照射处理3 h（强光处理），对实验室内人工光照下生长的幼苗进行临时强光（1 500 μmol·m^-2·s^-1）照射处理3 h（临时强光处理）。结果表明，强光胁迫对色素含量的影响较为复杂，品种间差异较大。强光处理对叶绿素含量的影响较小，对类胡萝卜素含量的影响较大；临时强光处理对叶绿素含量的影响较强光处理大，而类胡萝卜素含量与强光处理的差异不显著。强光胁迫抑制了所用供试品种的Fv/Fm比值，其中临时强光胁迫抑制作用更大。说明强光胁迫下PSⅡ的功能较易受到抑制，影响光电转换及电子传递，对光合作用影响较大。强光胁迫使光化学反射指数PRI呈降低的趋势，但是对PRI的影响比对上述指标的影响小。

英文摘要:

Eighteen winter wheat seedlings were used as materials to investigate the effects of different high light treatments on photosynthesis and as well as the correlative index on leaves. The high light treatment included long term strong light and 3 h temporary strong light, respectively. The results indicated that the content of photosynthetic pigments responded to high light stress in a complex way and varied greatly among wheat varieties. On the other hand, the effects of high light stress on the content of chlorophyll were more significant than on the content of carotenoid. In contrast, the temporary strong light stress had more significant effects on the content of chlorophyll than the high light stress. However, the effects of temporary strong light stress on content of carotenoid were not significant in comparison with the high light stress. High light stress decreased Fv/Fm in all studied seedlings, moreover, the inhibition of temporary high light on Fv/Fm was much stronger. It showed that high light stress could more easily inhibit the function of PSⅡ, reduce the photoelectric conversion and electron transport efficiency, and finally result in a great decrease of photosynthesis. High light stress decreased the PRI, but the effects were much slighter in comparison with the above parameters.

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