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《ACTA BOTANICA BOREALI-OCCIDENTALIA SINICA》 1998-04
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THE PHOTOINHIBITION OF PHOTOSYNTHESIS IN WINTER WHEAT LEAVES UNDER FIELD CONDITIONS

Zhao Shijie,Xu Changcheng,Meng Qingwei and Zou Qi ( Plant Physiology and Biochemistry Laboratory,Shandong Agricultural University ,Taian 271018)  
The degree of photoinhibition of photosynthesis was compared between vertical (leaf angle 80° from the horizontal) and horizontal (leaf angle 0°) winter wheat ( Triticum aestivum ) leaves subjected to midday strong light stress under field conditions.This was done by measuring the PSⅡ photochemical efficiency (Fv/Fm) and the apparent quantum yield (AQY).On a clear day with maximum light level above 1600 μmol·m -2 ·s -1 and maximum leaf temperature 37.6℃,the Fv/Fm and AQY of the horizontal leaves were much lower than those of the vertical leaves after exposure to midday strong light for 4 hours,showing a more severe photoinhibition developed in horizontal leaves.Since the differences in leaf water potential and leaf temperature were negligible between horizontal and vertical leaves,the light intensity was the only factor causing difference in the degree of photoinhibition.On clear days with maximum leaf temperature 34.5℃,no difference in the extent of photoinhibition was observed between vertical and horizontal leaves,although the maximum light level was still higher than 1600 μmol·m -2 ·s -1 .Based on these results,we couclude that the photoinhibition of photosynthesis in wheat leaves under field conditions in the result of the synergistic effect of high temperature and light stress when soil water is freely available.
【Fund】: 国家自然科学基金
【CateGory Index】: S512.101
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