逐渐干旱胁迫下生物土壤结皮中土生对齿藓和真藓信号转导物质的响应

Responses of signal transduction substances of Didymodon vinealis and Bryum argenteum in biological soil crust to gradual drought stress

以生物土壤结皮中土生对齿藓(Didymodon vinealis)和真藓(Bryum argenteum)为材料,研究了逐渐干旱胁迫下二者的信号传导相关物质的响应。结果表明:随干旱胁迫的增强,2种苔藓的细胞膜与液泡膜H+-ATPase活性增强,提高了二者的K+含量,增加了二者的渗透压,促进了二者的抗旱信号转导物质的合成;ABA对二者的信号转导作用都不明显,NO对土生对齿藓的抗旱作用不明显,但能提高真藓的抗旱性,而Ca2+只对土生对齿藓有明显信号转导作用,对真藓作用不明显。

Didymodon vinealis and Bryum argenteum were sampled from biological soil crusts to study the responses of their signal transduction substances to gradual drought stress. With increasing drought stress, the activities of TP H＋-ATPase and PM H＋-ATPase in D. vinealis and B. argenteum increased. As a result, the K＋ content and turgor pressure increased, and the biosynthesis of drought resistance signal transduction substances were stimulated. ABA had no obvious effects on the signal transduction mechanisms of D. vinealis and B. argenteum. NO was involved in the signal transduction mechanisms of B. argenteum, but had no obvious effects on D. vinealis. Ca2＋ played an important role in the signal transduction mechanisms of D. vinealis, but did not for B. argenteum.