A novel type of malformed floral organs mutant in barley was conferred by loss-of-function mutations of the MADS-box gene HvAGL6

文献类型： 外文期刊

第一作者： Sun, Man

作者： Sun, Man;Jiang, Congcong;Gao, Guangqi;An, Chaodan;Wu, Wenxue;Kan, Jinhong;Zhang, Jinpeng;Li, Lihui;Yang, Ping;Sun, Man

作者机构：

关键词： AGL6; barley (Hordeum vulgare); floral morphogenesis; MADS-box; MADS4; TILLING; transcriptomic analysis

期刊名称：PLANT JOURNAL （ 影响因子：6.2； 五年影响因子：7.1 ）

ISSN： 0960-7412

年卷期： 2024 年

页码：

收录情况： SCI

摘要： The advanced model of floral morphogenesis is based largely on data from Arabidopsis (Arabidopsis thaliana) and rice (Oryza sativa), but this process is less well understood in the Triticeae. Here, we investigated a sterile barley (Hordeum vulgare) mutant with malformed floral organs (designated mfo1), of which the paleae, lodicules, and stamens in each floret were all converted into lemma-like organs, and the ovary was abnormally shaped. Combining bulked-segregant analysis, whole-genome resequencing, and TILLING approaches, the mfo1 mutant was attributed to loss-of-function mutations in the MADS-box transcription factor gene HvAGL6, a key regulator in the ABCDE floral morphogenesis model. Through transcriptomic analysis between young inflorescences of wild-type and mfo1 plants, 380 genes were identified as differentially expressed, most of which function in DNA binding, protein dimerization, cell differentiation, or meristem determinacy. Regulatory pathway enrichment showed HvAGL6 associates with transcriptional abundance of many MADS-box genes, including the B-class gene HvMADS4. Mutants with deficiency in HvMADS4 exhibited the conversion of stamens into supernumerary pistils, producing multiple ovaries resembling the completely sterile multiple ovaries 3.h (mov3.h) mutant. These findings demonstrate that the regulatory model of floral morphogenesis is conserved across plant species and provides insights into the interactions between HvAGL6 and other MADS-box regulators.

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