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Flavonoid accumulation modulates the responses of cassava tuberous roots to postharvest physiological deterioration

文献类型： 外文期刊

作者： An, Feifei 1 ; Cui, Mengjia 3 ; Chen, Ting 4 ; Cheng, Cheng 5 ; Liu, Zhu 1 ; Luo, Xiuqin 2 ; Xue, Jingjing 2 ; Tang, Yanqiong 1 ; Cai, Jie 2 ; Chen, Songbi 2 ;

作者机构： 1.Hainan Univ, Sch Life Sci, Haikou 570228, Peoples R China

2.Chinese Acad Trop Agr Sci, Trop Crops Genet Resources Inst, Key Lab Minist Agr Germplasm Resources Conservat &, Haikou 571101, Peoples R China

3.Nanjing Agr Univ, Coll Agr, Nanjing 210095, Peoples R China

4.Hainan Normal Univ, Postgrad Dept, Haikou 571158, Peoples R China

5.Hainan Acad Forest, Haikou 571100, Peoples R China

关键词： Cassava; Tuberous roots; PPD; Transcriptome; Metabolome; Flavonoids

期刊名称：POSTHARVEST BIOLOGY AND TECHNOLOGY （ 影响因子：7.0； 五年影响因子：6.9 ）

ISSN： 0925-5214

年卷期： 2023 年 198 卷

页码：

收录情况： SCI

摘要： Postharvest physiological deterioration (PPD) caused by wounding is one of the main constraints that affect the development of cassava industry. However, the molecular mechanisms underlying the PPD are unknown. In the present study the adaptive response to wound stress was analyzed in combination with transcriptome and metabolome in four kinds of PPD phenomenon from cassava tuberous roots. The results indicated that starch, beta-carotene, (-)-epigallocatechin, cyanidin-3-O-glucoside, and L-epicatechin were altered in the wounded tuberous roots. Moreover, the ROS scavenging system was activated at the PPD preliminary stage. Transcriptome analysis further showed that the strongly induced genes were mainly related to carbohydrate metabolism, signal transduction, and polyketide metabolism. Twenty-eight differentially expressed genes (DEGs) in the flavonoid pathway were preferably enriched. The relative quantitative analysis of seventeen genes demonstrated that they were responsive to PPD. Fifty-one differential flavonoid metabolites were detected in widely targeted metabolome profile, among which, luteolin, kaempferol, (-) epicatechin, phloretin, and naringenin were enhanced during PPD. The virus-induced gene silencing of MeCHS3 and MeANR showed that tuberous roots changed tolerance to PPD, and the total flavonoid and anthocyanin contents in leaves were changed. Therefore, the candidate genes and metabolites in flavonoid pathways could participate in PPD regulation. In addition, a proposed model was generated to elaborate the response mechanism of flavonoids under wounding stress, thus providing a future direction for breeding PPD-tolerant cultivars of cassava.

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