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

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.