UV-B辐射对大豆和黄瓜幼苗某些生理特性的影响  

EFFECT OF UV B RADIATION ON PHYSIOLOGICAL PROPERTIES IN SOYBEAN AND CUCUMBER SEEDLINGS

作　　者：侯扶江[1] 贲桂英[2] 

机构地区：[1]中国科学院西北高原生物研究所,西宁810001 [2]甘肃草原生态研究所,兰州730020

出　　处：《应用与环境生物学报》1999年第5期455-458,共4页Chinese Journal of Applied and Environmental Biology

基　　金：国家自然科学基金

摘　　要：在植物生长室中，ＵＶ－ Ｂ辐射明显降低黄瓜幼苗的根系活力，抑制程度随辐射时间的延长而增强．黄瓜和大豆幼苗的叶绿素和可溶性蛋白含量减少与ＵＶＢ辐射时间长短呈正相关，但是类胡萝卜素减少幅度不大．ＵＶＢ对Ｃｈｌｂ 的破坏较Ｃｈｌａ 严重，导致Ｃｈｌａｂ 比值增大．ＵＶＢ虽增加大豆幼苗的ＳＯＤ活性，但降低大豆幼苗的ＮＲ活性及其对温度变化的敏感性．分析认为，Ｃｈｌａｂ 比值和ＳＯＤ 活性升高。Root activity of cucumber seedling was inhibited by UV B and the inhibition degree increased with increasing of UV B radiation time. UV B significantly reduced the contents of soluble protein and chlorophyll, and the reduced scope depended on UV B radiation time. Carotenoid content was slightly reduced by UV B. UV B made Chl b damaged more seriously than Chl a and caused the increase in Chl a/b ratio. UV B radiation enhanced SOD activity in soybean seedlings, but reduced NR activity and its sensitivity to variation of temperature. It was considered that the increase in both of Chl a/b ratio and SOD activity might play an important role in adaptability of plant to UV B radiation.

关 键 词：根系活力 SOD NR 大豆 黄瓜 紫外线B辐射 

分 类 号：Q945.112.1[生物学—植物学] S565.101[农业科学—作物学]