气体信号分子H2S和NO对冷胁迫下大白菜幼苗光合作用的影响

摘要

H2S和NO两种气体信号分子都具有增强植物耐受非生物胁迫的作用,但二者的相互作用尚不清楚.文章主要研究冷胁迫下,大白菜幼苗体内H2S和NO含量的变化对大白菜幼苗光合特性和光合相关基因表达的影响,以及两种信号分子之间的相互影响.研究结果表明,在大白菜幼苗响应冷胁迫时,H2S含量与NO的生物合成呈正相关,而NO对H2S生物合成的影响不显著;在冷胁迫条件下,H2S和NO都能够通过上调光合作用相关基因的表达量而增强大白菜幼苗的光合作用,但是外源H2S和NO共同处理时,这种增强效果没有叠加效应.%Both the gasotransmitters H2S and NO can enhance the plant's tolerance to abiotic stress,however,the interaction between them is not clear.This study explored the relationship between the changes of the content of H2S and NO in cabbage (Brassica rapa var.pekinensis) seedlings under chilling stress and the effects on their photosynthetic characteristics and the expression of photosynthetic-related genes.The results indicated that the content of H2S was positively correlated with the biosynthesis of NO,while NO had little influence on H2S biosynthesis.Moreover,H2S and NO could enhance the photosynthesis of cabbage seedlings by increasing the expression of photosynthesis-related genes under chilling stress.However,the expression would not increase when the seedlings had been treated with H2S and NO together.