The OsZHD1 and OsZHD2, Two Zinc Finger Homeobox Transcription Factor, Redundantly Control Grain Size by Influencing Cell Proliferation in Rice
文献类型： 外文期刊
作者： Guo, Mingliang 1 ; Zheng, Chun 3 ; Shi, Chao 3 ; Lu, Xiaozhuan 3 ; She, Zeyuan 1 ; Jiang, Shuyu 3 ; Tian, Dagang 2 ; Qin, Yuan 3 ;
作者机构： 1.Guangxi Univ, Coll Agr, State Key Lab Conservat & Utilizat Subtrop Agro Bi, Guangxi Key Lab Sugarcane Biol, Nanning 530004, Peoples R China
2.Fujian Acad Agr Sci, Biotechnol Res Inst, Fujian Prov Key Lab Genet Engn Agr, Fuzhou 350003, Peoples R China
3.Fujian Agr & Forestry Univ, Haixia Inst Sci & Technol, State Key Lab Ecol Pest Control Fujian & Taiwan Cr, Coll Life Sci,Fujian Prov Key Lab Haixia Appl Plan, Fuzhou 350002, Fujian, Peoples R China
关键词：
Rice; Zinc finger-homeodomain;
期刊名称：RICE （ 影响因子：5.0； 五年影响因子：5.5 ）
ISSN： 1939-8425
年卷期： 2025 年 18 卷 1 期
页码：
收录情况： SCI
摘要： Grain size is vital determinant for grain yield and quality, which specified by its three-dimensional structure of seeds (length, width and thickness). The ZINC FINGER-HOMEODOMAIN (ZHD) proteins play critical roles in plant growth and development. However, the information regarding the function in reproductive development of ZHD proteins is scarce. Here, we deeply characterized the phenotype of oszhd1, oszhd2, and oszhd1oszhd2. The single mutants of OsZHD1/2 were similar with wild type. Nevertheless, the double mutant displayed dwarfism and smaller reproductive organs, and shorter, narrower, and thinner grain size. oszhd1oszhd2 revealed a significant decrease in total cell length and number, and single cell width in outer parenchyma; reducing the average width of longitudinal epidermal cells, but the length were increased in outer and inner glumes of oszhd1oszhd2 compared with wild-type, oszhd1-1, oszhd2-1, respectively. OsZHD1 and OsZHD2 encoded the nucleus protein and were distributed predominately in stem and the developing spikelets, asserting their roles in grain size. Meanwhile, yeast two-hybrid, bimolecular fluorescence complementation, and Co-immunoprecipitation assay clarified that OsZHD1 could directly interacted with OsZHD2. The differential expression analysis showed that 839 DEGs, which were down-regulated in oszhd1oszhd2 than wild type and single mutants, were mainly enriched in secondary metabolite biosynthetic, integral component of membrane, and transporter activity pathway. Moreover, it is reliable that the altered expression of cell cycle and expansion-related and grain size-related genes were observed in RNA-seq data, highly consistent with the qRT-PCR results. Altogether, our results suggest that OsZHD1/2 are functional redundancy and involved in regulating grain size by influencing cell proliferation in rice.
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