文献类型： 外文期刊
作者： Xu, Binghua 1 ; Zhang, Chaoyang 1 ; Gu, Yan 1 ; Cheng, Rui 1 ; Huang, Dayue 1 ; Liu, Xin 1 ; Sun, Yudong 1 ;
作者机构： 1.Jiangsu Acad Agr Sci, Huaiyin Inst Agr Sci Xuhuai Reg Jiangsu, Huaian 223001, Peoples R China
期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.6； 五年影响因子：4.9 ）
ISSN： 2045-2322
年卷期： 2023 年 13 卷 1 期
页码：
收录情况： SCI
摘要： Leaf color mutants are important materials for studying chloroplast and photomorphogenesis, and can function as basic germplasms for genetic breeding. In an ethylmethanesulfonate mutagenesis population of watermelon cultivar "703", a chlorophyll-deficient mutant with yellow leaf (Yl2) color was identified. The contents of chlorophyll a, chlorophyll b, and carotenoids in Yl2 leaves were lower than those in wild-type (WT) leaves. The chloroplast ultrastructure in the leaves revealed that the chloroplasts in Yl2 were degraded. The numbers of chloroplasts and thylakoids in the Yl2 mutant were lower, resulting in lower photosynthetic parameters. Transcriptomic analysis identified 1292 differentially expressed genes, including1002 upregulated and 290 downregulated genes. The genes involved in chlorophyll biosynthesis (HEMA, HEMD, CHL1, CHLM, and CAO) were significantly downregulated in the Yl2 mutant, which may explain why chlorophyll pigment content was lower than that in the WT. Chlorophyll metabolism genes such as PDS, ZDS and VDE, were upregulated, which form the xanthophyll cycle and may protect the yellow-leaves plants from photodamage. Taken together, our findings provide insight into the molecular mechanisms of leading to leaf color formation and chloroplast development in watermelon.
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