Dose effects of restorer gene modulate pollen fertility in cotton CMS-D2 restorer lines via auxin signaling and flavonoid biosynthesis

文献类型： 外文期刊

第一作者： Zang, Rong

作者： Zang, Rong;Shahzad, Kashif;Zhang, Xuexian;Guo, Liping;Qi, Tingxiang;Tang, Huini;Wang, Ruijie;Wang, Hailin;Qiao, Xiuqin;Zhang, Meng;Wu, Jianyong;Xing, Chaozhu

作者机构：

关键词： Cotton (Gossypium hirsutum L.); CMS-D2; Pollen fertility restoration; Dose effects; Auxin signaling; Flavonoid biosynthesis

期刊名称：PLANT CELL REPORTS （ 影响因子：6.2； 五年影响因子：5.9 ）

ISSN： 0721-7714

年卷期： 2023 年 42 卷 11 期

页码：

收录情况： SCI

摘要： Key message Dose effects of Rf(1) gene regulated retrieval mechanism of pollen fertility for CMS-D2 cotton.Cytoplasmic male sterility conditioned by Gossypium harknessii cytoplasm (CMS-D2) is an economical pollination control system for producing hybrid cotton seeds compared to artificial and chemical emasculation methods. However, the unstable restoring ability of restorer lines is a main barrier in the large-scale application of "three-line" hybrid cotton in China. Our phenotypic investigation determined that the homozygous Rf(1)Rf(1) allelic genotype had a stronger ability to generate fertile pollen than the heterozygous Rf(1)rf(1) allelic genotype. To decipher the genetic mechanisms that control the differential levels of pollen fertility, an integrated metabolomic and transcriptomic analysis was performed at two environments using pollen grains of four cotton genotypes differing in Rf(1) alleles or cytoplasm. Totally 5,391 differential metabolite features were detected, and 369 specific differential metabolites (DMs) were identified between homozygous and heterozygous Rf(1) allelic genotypes with CMS-D2 cytoplasm. In addition, transcriptome analysis identified 2,490 differentially expressed genes (DEGs) and 96 unique hub DEGs with dynamic regulation in this comparative combination. Further integrated analyses revealed that several key DEGs and DMs involved in indole biosynthesis, flavonoid biosynthesis, and sugar metabolism had strong network linkage with fertility restoration. In vitro application of auxin analogue NAA and inhibitor Auxinole confirmed that over-activated auxin signaling might inhibit pollen development, whereas suppressing auxin signaling partially promoted pollen development in CMS-D2 cotton. Our results provide new insight into how the dosage effects of the Rf(1) gene regulate pollen fertility of CMS-D2 cotton.

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