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H_2S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H_2S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,H_2S含量与NO的生物合成呈正相关,而NO对H_2S生物合成的影响不显著;在冷胁迫条件下,H_2S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H_2S和NO共同处理时,这种增强效果没有叠加效应。
H 2 S and NO both gas signaling molecules have enhanced plant tolerance to abiotic stress, but the interaction between the two is unclear. The main purpose of this paper is to investigate the effects of changes of H 2 S and NO content on photosynthetic characteristics and photosynthetic genes in Chinese cabbage seedling under cold stress and the interaction between the two signaling molecules. The results showed that there was a positive correlation between H 2 S content and NO biosynthesis in response to cold stress in Chinese cabbage seedlings, while NO had no significant effect on H 2 S biosynthesis. Under cold stress, H 2 S and NO both increased photosynthesis The photosynthesis of Chinese cabbage seedling was enhanced by the expression level of related genes, but there was no additive effect when the exogenous H 2 S and NO were co-treated.