紫外光B辐射增强对水稻叶片内IAA和ABA含量的影响

INFLUENCE OF SUPPLEMENTAL ULTRAVIOLET B RADIATION ON IAA AND ABA CONTENT IN THE LEAVES OF RICE

两个水稻品种ＣＫ４６和Ｄｕｌａｒ生长在人工气候箱的条件下，在０．０和１３．０ｋＪｍ－２ｄａｙ－１（模拟臭氧浓度下降２０％的ＵＶＢ强度）的紫外光Ｂ（ＵＶＢ２８０ｎｍ～３２０ｎｍ）下进行４周的照射处理，研究ＵＶＢ对水稻体内内源ＩＡＡ和ＡＢＡ含量的影响。结果表明：随着ＵＶＢ处理时间的延长，ＣＫ４６和Ｄｕｌａｒ叶片内的ＩＡＡ含量下降。相反，ＵＶＢ辐射增强使两个品种叶片内的ＡＢＡ含量上升。

Two rice cultivars “CK46” and “Dular” were grown in phytotron experiment treated by 0.0 and 13.0 kJ m -2 day -1 (stimulating 20% ozone depletion) of biologically effective ultraviolet B (UV B BE ) for four weeks to study the effect of supplemental UV B radiation on IAA and ABA content in the leaves of rice. The results showed that IAA contents in the leaves of “CK46” and “Dular” were reduced with time course of UV B radiation. On the contrary,ABA contents in the leaves of both cultivar were dramatically increased when treated by UV B radiation.