Molecular mechanism of naringenin regulation on flavonoid biosynthesis to improve the salt tolerance in pigeon pea (Cajanus cajan (Linn.) Millsp.)

柚皮素 类黄酮生物合成 苯丙素 类黄酮 生物 生物化学 次生代谢 代谢途径 生物合成 转录组 非生物胁迫 查尔酮异构酶 异黄酮 MYB公司 转录因子 基因表达 基因 查尔酮合酶 抗氧化剂
作者
Mengying Wang,Biying Dong,Zhihua Song,Qi Meng,Ting Chen,Tingting Du,Hongyan Cao,Geoffrey Liu,Dong Meng,Qing Yang,Yujie Fu
出处
期刊:Plant Physiology and Biochemistry [Elsevier]
卷期号:196: 381-392 被引量:4
标识
DOI:10.1016/j.plaphy.2023.02.002
摘要

Flavonoids are important secondary metabolites in the plant growth and development process. As a medicinal plant, pigeon pea is rich in secondary metabolites. As a flavonoid, there are few studies on the regulation mechanism of naringenin in plant stress resistance. In our study, we found that naringenin can increase the pigeon pea's ability to tolerate salt and influence the changes that occur in flavonoids including naringenin, genistein and biochanin A. We analyzed the transcriptome data after 1 mM naringenin treatment, and identified a total of 13083 differentially expressed genes. By analyzing the metabolic pathways of these differentially expressed genes, we found that these differentially expressed genes were enriched in the metabolic pathways of phenylpropanoid biosynthesis, starch and sucrose metabolism and so on. We focused on the analysis of flavonoid biosynthesis related pathways. Among them, the expression levels of enzyme genes CcIFS, CcCHI and CcCHS in the flavonoid biosynthesis pathway had considerably higher expression levels. By counting the number of transcription factors and the binding sites on the promoter of the enzyme gene, we screened the transcription factors CcMYB62 and CcbHLH35 related to flavonoid metabolism. Among them, CcMYB62 has a higher expression level than the others. The hairy root transgene showed that CcMYB62 could induce the upregulation of CcCHI, and promote the accumulation of naringenin, genistein and biochanin A. Our study revealed the molecular mechanism of naringenin regulating flavonoid biosynthesis under salt stress in pigeon pea, and provided an idea for the role of flavonoids in plant resistance to abiotic stresses.
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