水稻植株在二化螟为害后的生理变化

研究了不同类型水稻品种在二化螟为害后植株体内的一些生理变化，包括叶绿素含量、根系活力和钾元素吸收能力。不同水稻品种在主茎受二化螟为害形成枯心后，分蘖的叶绿素含量均降低，但与健康植株相比无显著差异。常规杂交稻汕优63和超级杂交稻两优培九在主茎枯心过程中根系活力显著增强，而粳稻秀水11枯心后根系活力反而显著下降。采用86Rb标记示踪原子法研究了在二化螟为害后水稻根系对土壤中钾的吸收能力的变化，发现秀水11主茎枯心24 h和48 h后分蘖中铷的含量比健康植株分别降低了5.23%和47.5%，说明对钾的吸收能力下降，而汕优63和两优培九分蘖中铷的含量分别比健康植株增加了2.91%和14.36%、21.3%和15.9%，即对钾的吸收能力提高。

Some Physiological Changes of Rice Plants Damaged by Striped Stem Borer, Chilo suppressalis

Some physiological changes in chlorophyll content,root activity and potassium uptake ability of rice plants infested by the larvae of the striped stem borer(SSB),Chilo suppressalis,were determined by using different rice varieties including indica hybrid rice Shanyou 63,indica super high-yielding hybrid rice Liangyoupeijiu and japonica rice Xiushui 11.Results showed that the chlorophyll content in tillers of dead-heart plants damaged by the SSB larvae decreased in all the three tested varieties,however there were no obvious difference between the damaged and healthy plants.The root activities of Shanyou 63 and Liangyoupeijiu increased while that of Xiushui 11 decreased in damaged plants.After being labeled with rubidium for 24 and 48 h,the content of rubidium in the dead-heart tillers of Shanyou 63 and Liangyoupeijiu were higher than that in tillers of the healthy plants,however the contrary trends were observed in Xiushui 11.It implied that the damage by the SSB enhanced the potassium uptake ability of the indica and super high-yielding hybrids and their compensation abilities were significantly higher compared to japonica rice Xiushui 11.