Alternative oxidase gene induced by nitric oxide is involved in the regulation of ROS and enhances the resistance of Pleurotus ostreatus to heat stress

Microbial Cell Factories

Chenyang Huang¹  Lijiao Zhang¹  Mengran Zhao¹  Ludan Hou¹  Jinxia Zhang¹  Qi He² 

[1]Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, 10081, Beijing, China

[2]Key Laboratory of Microbial Resources, Ministry of Agriculture and Rural Affairs, 10081, Beijing, China

[3]Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, 10081, Beijing, China

[4]Key Laboratory of Microbial Resources, Ministry of Agriculture and Rural Affairs, 10081, Beijing, China

[5]Jilin Agricultural University, 130118, Jilin, China

关键词: Pleurotus ostreatus;    Nitric oxide;    ROS;    RNA-Seq;    Alternative oxidase;    Antioxidant enzymes;   

DOI  :  10.1186/s12934-021-01626-y

来源: Springer

【 摘 要 】

BackgroundIn China, during the cultivation process of Pleurotus ostreatus, the yield and quality of fruiting bodies are easily affected by high temperatures in summer. Nitric oxide (NO) plays an important regulatory role in the response to abiotic stress, and previous studies have found that NO can induce alternative oxidase (aox) experssion in response to heat stress (HS) by regulating aconitase. However, the regulatory pathway of NO is complex, and the function and regulation of the aox gene in the response to HS remain unclear.ResultsIn this study, we found that NO affected nicotinamide adenine dinucleotide (NADH) and adenosine triphosphate (ATP) levels, reduced hydrogen peroxide (H2O2) and superoxide anion (O2−) contents, and slowed O2− production. Further RNA-Seq results showed that NO regulated the oxidation-reduction process and oxidoreductase activity, affected the cellular respiration pathway and activated aox gene expression. The function of aox was determined by constructing overexpression (OE) and RNA interference (RNAi) strains. The results showed that the OE-aox strains exhibited obviously improved growth recovery after exposure to HS. During exposure to HS, the OE-aox strains exhibited reduced levels of NADH, the product of the tricarboxylic acid (TCA) cycle, and decreased synthesis of ATP, which reduced the production and accumulation of reactive oxygen species (ROS), whereas the RNAi-aox strains exhibited the opposite result. In addition, aox mediated the expression of antioxidant enzyme genes in the mycelia of P. ostreatus under HS through the retrograde signaling pathway.ConclusionsThis study shows that the expression of the aox gene in P. ostreatus mycelia can be induced by NO under HS, that it regulates the TCA cycle and cell respiration to reduce the production of ROS, and that it can mediate the retrograde signaling pathway involved in the mycelial response to HS.Graphical abstract

【 授权许可】

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