UV-B辐射对大豆和黄瓜幼苗某些生理特性的影响

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，有助于植物对ＵＶＢ的适应

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

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.