不同剂量UV-B辐射对冬小麦幼苗形态及生理指标的影响

Effects of different dose UV-B radiation on the morphological and physiological indices of winter wheat seedlings

UV-B辐射增强对植物的影响效果存在差异,即使是同一物种的不同品种之间也存在差异。本研究以对UV-B不同耐性的2个冬小麦品种"科遗26"和"泰山269"为材料,比较了品种间及UV-B的剂量间的形态指标、生物量及生理指标的差异。结果表明:高剂量UV-B处理抑制了株高、叶色、茎数、鲜质量、光反应系统Ⅱ(PSⅡ)最大光化学效率(Fv/Fm)和光合速率,促进了丙二醛、类黄酮含量的增加及相对电导率的提高,2个品种的趋势基本相同,但泰山269的变化幅度大于科遗26,说明泰山269比科遗26敏感;低剂量的UV-B对株高、叶色、茎数、鲜质量表现出促进的趋势,对类黄酮的促进作用较大,对Fv/Fm、丙二醛及相对电导率的影响相对较小。

Enhanced UV-B radiation has different effects on different plants,and even,on the different varieties of same plant species. Taking two winter wheat varieties （Keyi 26 and Taishan 269） with different UV-B tolerance as test materials,this paper compared their morphological indices,biomass,and physiological indices under effects of different dose UV-B radiation. For the two test varieties,high dose UV-B radiation decreased their plant height,leaf color value,tiller number,fresh weight,Fv/Fm,and photosynthesis rate,but increased their leaf MDA and flavonoid contents and relative electric conductivity. In these aspects,wheat variety Taishan 269 showed more apparent variations than Keyi 26,suggesting that the former was more sensitive to enhanced UV-B radiation. Low dose UV-B radiation promoted the plant height,leaf color value,tiller number,fresh mass,and especially,flavonoid content of test varieties,but had less effects on the Fv/Fm,leaf MDA content,and leaf relative electric conductivity.