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Metabolic, transcriptomic, and genetic analyses of candidate genes for seed size in watermelon

文献类型： 外文期刊

作者： Wang, Xiqing 1 ; Yan, Wen 1 ; Real, Nuria 3 ; Jia, Yunhe 1 ; Fu, Yongkai 1 ; Zhang, Xuejun 4 ; You, Haibo 1 ; Cai, Yi 1 ; Liu, Bin 5 ;

作者机构： 1.Heilongjiang Acad Agr Sci, Hort Branch, Harbin, Peoples R China

2.Ctr Res Vegetable Engn Technol Heilongjiang, Harbin, Peoples R China

3.IRTA Cabrils, Plant Pathol, Cabrils, Spain

4.Xinjiang Acad Agr Sci, Hainan Sanya Crops Breeding Trial Ctr, Sanya, Peoples R China

5.Xinjiang Acad Agr Sci, Hami Melon Res Ctr, Urumqi, Peoples R China

关键词： watermelon; seed size; genetic mapping; transcriptomic analysis; metabolic analysis

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：4.1； 五年影响因子：5.3 ）

ISSN： 1664-462X

年卷期： 2024 年 15 卷

页码：

收录情况： SCI

摘要： Seed size (SS) constitutes a pivotal trait in watermelon breeding. In this study, we present findings from an examination of two watermelon accessions, namely, BW85 and F211. Seeds from BW85 exhibited a significant enlargement compared to those of F211 at 13 days after pollination (DAP), with the maximal disparity in seed length and width manifesting at 17 DAP. A comprehensive study involving both metabolic and transcriptomic analyses indicated a significant enrichment of the ubiquinone and other terpenoid-quinone biosynthesis KEGG pathways. To detect the genetic region governing seed size, a BSA-seq analysis was conducted utilizing the F2 (BW85 x F211) population, which resulted in the identification of two adjacent QTLs, namely, SS6.1 and SS6.2, located on chromosomes 6. SS6.1 spanned from Chr06:4847169 to Chr06:5163486, encompassing 33 genes, while SS6.2 ranged from Chr06:5379337 to Chr06:5419136, which included only one gene. Among these genes, 11 exhibited a significant differential expression between BW85 and F211 according to transcriptomic analysis. Notably, three genes (Cla97C06G113960, Cla97C06G114180, and Cla97C06G114000) presented a differential expression at both 13 and 17 DAP. Through annotation, Cla97C06G113960 was identified as a ubiquitin-conjugating enzyme E2, playing a role in the ubiquitin pathway that mediates seed size control. Taken together, our results provide a novel candidate gene influencing the seed size in watermelon, shedding light on the mechanism underlying seed development.

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