论文部分内容阅读
水稻品种IR68和Dular生长在室外条件下,在以自然条件(6.0)、13.0和19.1 kJm~(-2) day(-1)(分别模拟臭氧浓度下降20％和40％时的UV-B强度)的紫外光B(UV-B 280～320nm)进行二周与四周的照射处理,研究UV-B对水稻叶片内一些生化指标的影响。研究结果表明:UV-B辐射增强诱导了二个水稻品种叶片内吸收UV的类黄酮化合物的积累,同时使叶片内多胺的含量明显提高。然而,19.1 kJm~(-2)day~(-1)的UV-B辐射显著抑制了IR68和Dular叶片内的过氧化氢酶和SOD酶的活性。UV-B强度的增加比处理时间的延长对这些指标的影响更明显。以上结果说明,水稻是通过吸收UV的类黄酮和多胺的积累而不是以提高抗氧化酶的活性来适应UV-B辐射增强的。
Under natural conditions (6.0), 13.0 and 19.1 kJm -2 day (-1) respectively, the IR68 and Dular cultivars grown under outdoor conditions were simulated UV-B intensity at 20% and 40% reduction respectively ) UV light B (UV-B 280 ~ 320nm) for two weeks and four weeks to study the effects of UV-B on some biochemical indexes in rice leaves. The results showed that enhanced UV-B radiation induced the accumulation of flavonoids in the leaves of two rice cultivars, and at the same time, the content of polyamines in the leaves was significantly increased. However, UV-B radiation at 19.1 kJm -2 day -1 significantly inhibited catalase and SOD activity in IR68 and Dular leaves. The effect of UV-B intensity increase over treatment time on these indices is more pronounced. The above results indicate that rice is enhanced by UV-B radiation by absorbing the accumulation of flavonoids and polyamines rather than enhancing the activity of antioxidant enzymes.