UV-B辐射胁迫对水稻叶绿素荧光动力学的影响

Effects of enhanced UV-B radiation stress on kinetics of chlorophyll fluorescence in rice Coryza sativa L

摘要: 研究结果表明，增强的紫外线-B(UV-B，280～320nm)辐射会导致水稻植株矮化4.71%～16.59%、叶面积变小、干物质生产量减少11.79%～60.57%。究其原因主要是叶片光合作用色素叶绿素a、叶绿素b和类胡萝卜素含量的降低和叶绿素a荧光动力学参数的改变，光合系统Ⅱ受到破坏，光合作用能力下降、生长发育受阻。

Abstract: Enhanced UV-B radiation would shorten plant height by 4.71%～16.59%,decrease leaf area and reduce dry matter of rice seedlings by 11.79%～60.57%,which is attributed to content decrease of chlorophyll-a,chlorophyll-b and carotenoid,parameter change of chlorophyll-a fluorescence,photosystemⅡ (PSⅡ) damage,photosynthesis decrease and retard growth and development of rice plant.