农科机构知识库联盟

Enrichment of two important metabolites d-galacturonic acid and d-glucuronic acid inhibits MdHb1-mediated fruit softening in apple

文献类型：外文期刊

第一作者： Zhao, Yu-Wen

作者： Zhao, Yu-Wen;Zhao, Ting-Ting;Sun, Quan;Liu, Xiao-Long;Huang, Xiao-Yu;Li, Wan-Kun;Wang, Chu-Kun;Wang, Wen-Yan;Ma, Chang-Ning;Chen, Xue-Sen;Hu, Da-Gang;Zhao, Yu-Wen;Zhao, Ting-Ting;Sun, Quan;Liu, Xiao-Long;Huang, Xiao-Yu;Li, Wan-Kun;Wang, Chu-Kun;Wang, Wen-Yan;Ma, Chang-Ning;Chen, Xue-Sen;Hu, Da-Gang;Zhao, Yu-Wen;Zhao, Ting-Ting;Sun, Quan;Liu, Xiao-Long;Huang, Xiao-Yu;Li, Wan-Kun;Wang, Chu-Kun;Wang, Wen-Yan;Ma, Chang-Ning;Chen, Xue-Sen;Hu, Da-Gang;Li, Lin-Guang;Wang, Hai-Bo;Xiang, Ying;Cheng, Lailiang

作者机构：

期刊名称：NATURE PLANTS （影响因子：13.6；五年影响因子：17.0 ）

ISSN： 2055-026X

年卷期： 2025 年

页码：

收录情况： SCI

摘要： In apples, fruit firmness is a crucial quality trait influencing fruit storability, transportability, shelf life and consumer preference. However, the genetic network underlying this trait remains unclear. Therefore, the present study investigated the changes in apple fruit at different stages of postharvest storage using a combination of transcriptomic and metabolomic analyses. With prolonged storage, we detected a significant increase in two metabolites, d-galacturonic acid (d-GalUA) and d-glucuronic acid (d-GlcA), which are associated with a key class 1 non-symbiotic haemoglobin (MdHb1). We innovatively found that MdHb1 regulates fruit softening by catalysing the conversion from protopectin to water-soluble pectin. Biochemical analysis demonstrated that MdMYB2/MdNAC14/MdNTL9 transcription factors directly bind to the MdHb1 promoter to activate its transcriptional expression and promote fruit softening. Further injection experiments in apple fruit and histological as well as transmission electron microscopy analyses of the fruit samples revealed that d-GalUA and d-GlcA reduce the transcription of MdHb1, or through the MdMYB2/MdNAC14/MdNTL9-MdHb1 regulatory module, thereby delaying fruit softening. Our study provides novel insights into the role of two important metabolites, d-GalUA and d-GlcA, in the regulation of MdHb1-mediated fruit softening in apples.

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