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Application of exogenous cytokinin regulates cytokinin oxidase and antioxidant activity to maintain chlorophyll pigment during ripening of banana fruit

文献类型： 外文期刊

作者： Huang, Hua 1 ; He, Weidi 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Inst Fruit Tree Res, Guangzhou 510640, Peoples R China; Minist Agr & Rural Affairs, Key Lab South Subtrop Fruit Biol & Genet Resource, Guangdong Prov Key Lab Trop & Subtrop Fruit Tree R, Guangzhou 510640, Peoples R China

关键词： Banana ripening; Chlorophyll pigment; Cytokinin; Cytokinin oxidase; CPPU; Antioxidant activity

期刊名称：FOOD BIOSCIENCE （ 影响因子：5.2； 五年影响因子：5.4 ）

ISSN： 2212-4292

年卷期： 2023 年 55 卷

页码：

收录情况： SCI

摘要： Banana fruit ripening is accompanied by changes in activity of chlorophyll degradation. Herein, the application of exogenous cytokinin of forchlorfenuron (CPPU) to delay the ripening process by retarding degradation of chlorophyll was investigated. The changes in peel color, hue angle, chlorophyll fluorescence, and chlorophyll content were significantly inhibited by exogenous application of cytokinin. Content of endogenous cytokinin of t-zeatin was maintained and the increase of cytokinin oxidase (CKX) activity was retarded. Similar change trends were verified in the isolated peel tissues treated with CPPU. Relative expression level of the genes involved in cytokinin synthesis (MaIPT1/12) were upregulated, and CKX-related (MaCKX1/12) and chlorophyll degradation-related catabolism (MaPAO1, MaCLH1, MaSGR1, MaRCCR1, and MaRCCR12) were downregulated during storage. In addition, the scavenging activity of free radicals and membrane integrity were stabilized. Application of exogenous cytokinin of CPPU was proposed to competitively inhibit CKX activity to maintain endogenous cytokinin level, which further delayed chlorophyll degradation during banana fruit ripening.

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