多蒴灰藓对强紫外线照射的生理响应

Physiological Responses to Enhanced UV-B Radiation of Hypnum fertile

摘要:

将多蒴灰藓(Hypnum fertile)置于紫外辐射下照光3周，研究了紫外辐射对多蒴灰藓的损害及其生理响应。结果表明： 与对照(自然环境)相比，多蒴灰藓的叶绿素和类胡萝卜素含量均随紫外辐射时间的延长而减少，MDA含量却明显增加，SOD、POD和CAT活性也相应增加；增加紫外辐射量会引起多蒴灰藓的氧化胁迫，其能通过增加抗氧化酶的活性来减轻这种胁迫。

Abstract:

The damages of Hypnum fertile (Bryopsida: Musci) and its physiological responses were studied under enhanced UV-B radiation for 3 weeks. The doses of biologically effective UV-B irradiation were 6.93 kJ m-2d-1 (ambient UV-B radiation) and 9.01 kJ m-2d-1 (enhanced UV-B radiation, about 30% higher than ambient UV-B radiation), respectively. The results showed that the contents of chlorophyll and carotenoid of H. fertile both decreased with time under enhanced UV-B radiation, whereas MDA content significantly increased，and the activities of SOD, POD and CAT all increased. It is suggested that enhanced UV-B radiation caused oxidative stress to H. fertile and the oxidative stress might be alleviated by increasing the enzymes activities.