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Changes in Homogalacturonan Metabolism in Banana Peel during Fruit Development and Ripening

文献类型： 外文期刊

作者： Ning, Tong 1 ; Chen, Chengjie 1 ; Yi, Ganjun 2 ; Chen, Houbin 1 ; Liu, Yudi 1 ; Fan, Yanjie 1 ; Liu, Jing 1 ; Chen, Shule 1 ; Wei, Sixuan 1 ; Li, Zexuan 1 ; Tan, Yehuan 1 ; He, Zhenting 1 ; Xu, Chunxiang 1 ;

作者机构： 1.South China Agr Univ, Coll Hort, Dept Hort, Guangzhou 510642, Peoples R China

2.Guangdong Acad Agr Sci, Inst Fruit Tree Res, Guangzhou 510640, Peoples R China

3.Maoming Branch, Guangdong Lab Lingnan Modern Agr, Maoming 525000, Peoples R China

关键词： banana (Musa spp. AAA); fruit development and ripening; fruit peel; homogalacturonan metabolism; immunofluorescence labeling

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：6.208； 五年影响因子：6.628 ）

ISSN：

年卷期： 2022 年 23 卷 1 期

页码：

收录情况： SCI

摘要： Though numerous studies have focused on the cell wall disassembly of bananas during the ripening process, the modification of homogalacturonan (HG) during fruit development remains exclusive. To better understand the role of HGs in controlling banana fruit growth and ripening, RNA-Seq, qPCR, immunofluorescence labeling, and biochemical methods were employed to reveal their dynamic changes in banana peels during these processes. Most HG-modifying genes in banana peels showed a decline in expression during fruit development. Four polygalacturonase and three pectin acetylesterases showing higher expression levels at later developmental stages than earlier ones might be related to fruit expansion. Six out of the 10 top genes in the Core Enrichment Gene Set were HG degradation genes, and all were upregulated after softening, paralleled to the significant increase in HG degradation enzyme activities, decline in peel firmness, and the epitope levels of 2F4, CCRC-M38, JIM7, and LM18 antibodies. Most differentially expressed alpha-1,4-galacturonosyltransferases were upregulated by ethylene treatment, suggesting active HG biosynthesis during the fruit softening process. The epitope level of the CCRC-M38 antibody was positively correlated to the firmness of banana peel during fruit development and ripening. These results have provided new insights into the role of cell wall HGs in fruit development and ripening.

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