摘要
[Objective] The study aimed at investigating the influence of enhanced UV-B radiation on photosynthesis of grapevine.[Method] The seedlings of Cabernet sauvignon were treated with different intensities of UV-B radiation under outdoor conditions,and then the contents of photosynthetic pigments and flavonoids in leaves were determined by measuring the absorbance of leaves extracts at 663,645,470 and 300 nm,respectively.[Result] The content of photosynthetic pigments in the leaves of grapevine obviously increased with time under the treatments of different enhanced UV-B radiation.Compared with the control,the chlorophyll a,chlorophyll b,total chlorophyll and carotenoid were obviously increased by 5%,2%,4% and 3% in the enhanced UV-B radiation treatment of 10.8 μW/cm2（T1）,and in the treatment of 25.6 μW/cm2（T2） the corresponding levels were subsequently increased by 11%,9%,10% and 7% with a significant increase in the content of chlorophyll a.On the other hand,the flavonoids content in the leaves of grapevine were obviously increased by 13%,9% in T1 and T2.[Conclusion] The grapevine has strong adaptability to UV-B radiation,and appropriate enhanced UV-B radiation couldn＇t decrease the photosynthesis of grapevine leaves.
[目的]研究UV-B辐射对葡萄叶片光合色素和类黄酮含量的影响,以期为研究UV-B辐射增强对葡萄光合作用的影响提供依据。[方法]试验在室外条件下,以酿酒葡萄"赤霞珠"(Cabernet Sauvignon)为材料,通过增加不同强度的UV-B辐射,测量葡萄叶片光合色素和类黄酮含量的影响。[结果]低辐射(T1)处理下,叶绿素a、叶绿素b、总叶绿素、类胡萝卜素含量平均值分别比对照增加了5%、2%、4%、3%;高辐射(T2)处理下,叶绿素a、叶绿素b、总叶绿素、类胡萝卜素含量分别比对照增加了11%、9%、10%、7%,其中,叶绿素a差异达显著水平。类黄酮的含量也随着UV-B辐射天数延长而显著增加,T1、T2平均值分别比对照增加了13%、9%。[结论]葡萄对UV-B辐射增强具有较强的适应性,一定范围内适当增加UV-B辐射可能不会对葡萄叶片的光合作用产生不利的影响。
