低温胁迫下硼酸对兰引3号结缕草的生理效应初探

［目的］探讨低温胁迫下不同浓度的硼酸溶液对兰引3号结缕草各项生理指标的影响，为提高低温胁迫下兰引3号结缕草草坪质量提供参考。［方法］以兰引3号结缕草为供试品种，用2种不同浓度的硼酸溶液（16、32μmol/L）喷施2次，研究低温胁迫下硼酸对兰引3号结缕草叶绿素、可溶性糖、游离脯氨酸、丙二醛含量及相对膜透性的影响。［结果］低温胁迫下16μmol/L硼酸处理及32μmol/L硼酸处理都能提高兰引3号结缕草叶绿素、可溶性糖、游离脯氨酸含量，同时降低丙二醛含量，另外，对保护细胞膜系统也起到积极作用。其中，以16μmol/L硼酸处理的效果较好，叶绿素含量、可溶性糖含量及游离脯氨酸含量分别比对照提高了37.5%、41.2%、45.1%，而丙二醛含量则降低了16.4%，相对膜透性降低了145.0%（A260）和50.0%（A280）。［结论］低温胁迫下，16μmol/L硼酸处理有利于增强兰引3号结缕草抵御低温冷害的能力。

The Physiological Effect of Boric Acid on Zoysia japonica cv.Lanyin No 3 under Low Temperature Stress

[Objective] The aim was to study the effect of boric acid on Zoysia japonica cv.Lanyin No 3 under low temperature stress so as to provide reference for improving lawn quality of Zoysia japonica cv.Lanyin No 3 under low temperature stress.[Method] Two density boric acid which were 16 μmol/ L and 32 μmol/L respectively were sprayed twice on Zoysia japonica cv.Lanyin No 3 to study effect of boric acid on the chlorophyll,the soluble sugar,the dissociative proline,the malonaldehyde content and the relative membrane penetrability of Zoysia japonica cv.Lanyin No 3.[Result] The results showed that under the low temperature stress the 16 μmol/L boric acid treatment and the 32 μmol/L boric acid treatment could enhance the chlorophyll,the soluble sugar,the dissociative proline content of Zoysia japonica steud.Lanyin No 3,simultaneously the malonaldehyde content reduced,As a result,the cell membrane system had been protected.The 16 μmol/L boric acid treatment got the better effect,the chlorophyll content,the soluble sugar content and the dissociative proline content enhanced separately 37.5%,41.2%,45.1% compared to the comparison,but the malonaldehyde content reduced 16.4%,the relative membrane penetrability reduced 145.0%(A_(260)) and 50.0%(A_(280)).[Conclusion] The 16 μmol/L boric acid treatment could enhance resistance of low temperature stress of Zoysia japonica cv.Lanyin No 3.