紫外辐射对菜豆不同叶位叶片光合及保护酶活性的影响

生态学杂志

紫外辐射对菜豆不同叶位叶片光合及保护酶活性的影响

李雪梅^1,2；何兴元¹；张利红¹；王兰兰²；陈强²

¹中国科学院沈阳应用生态研究所，沈阳 110016； ²沈阳师范大学化学与生命科学学院，沈阳 110034

收稿日期:2005-07-04 修回日期:2005-12-14 出版日期:2006-05-10 发布日期:2006-05-10

Effects of ultraviolet radiation on photosynthesis and protective enzyme activities of bean leaves at different position on stem

LI Xuemei^1,2;HE Xingyuan¹;ZHANG lihong¹;WANG Lanlan²;CHEN Qiang²

¹Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016, China; ² College of Chemistry and Life Sciences,Shenyang Normal University,Shenya

ng 110034, China

Received:2005-07-04 Revised:2005-12-14 Online:2006-05-10 Published:2006-05-10

摘要/Abstract

摘要： 以菜豆为实验材料，用紫外辐射处理，测定植物各叶位叶片的生理活性。结果表明，紫外辐射条件下，叶片的光合、蒸腾速率先升高，随后迅速降低，辐射处理3 h对光合作用的抑制程度随叶位升高而增加；第1叶气孔导度和胞间CO₂浓度随辐射处理略有增加，而第2、3叶的则先升高随后降低；辐射处理使叶绿素含量先降低随后有所增加，但明显增加叶片丙二醛(MDA)含量；紫外辐射处理后，叶片过氧化物酶(POD)活性先升高随后降低，紫外辐射3 h第1叶POD活性比对照降低26.9%，辐射使第1叶超氧化物歧化酶(SOD)活性略有升高，但明显降低第2、3叶的SOD活性。

关键词: 沼泽湿地, 植物器官, N素动态变化

Abstract: The study on the physiological activities of bean leaves at different position on stem showed that,under ultraviolet radiation，the photosynthesis and transpiration rate of leaves increased first and decreased then.After 3 h ultraviolet radiation,the inhibition rate of photosynthesis was increased with increasing leaf position.The stomatal conductance and intercellular CO₂ of the first leaf enhanced slightly,while those of the second and third leaves enhanced first but decreased then.Ultraviolet radiation made the chlorophyll content decreased first and enhanced then,and made the MDA content enhanced significantly.The POD activity under ultraviolet radiation enhanced first and decreased then,and after 3 h ultraviolet radiation,the POD activity in the first leaf was 26.9% lower than the control.Ultraviolet radiation slightly raised the SOD activity of the first leaf,but sharply inhibited the SOD activity of the second and third leaves.

Key words: Swamp wetland, Vegetable organs, N content dynamics

李雪梅；何兴元；张利红；王兰兰；陈强 . 紫外辐射对菜豆不同叶位叶片光合及保护酶活性的影响[J]. 生态学杂志.

LI Xuemei^1,2;HE Xingyuan¹;ZHANG lihong¹;WANG Lanlan²;CHEN Qiang² . Effects of ultraviolet radiation on photosynthesis and protective enzyme activities of bean leaves at different position on stem[J]. cje.

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