BcpLH organizes a specific subset of microRNAs to form a leafy head in Chinese cabbage (Brassica rapa ssp. pekinensis)
文献类型： 外文期刊
作者： Ren, Wenqing 1 ; Wu, Feijie 1 ; Bai, Jinjuan 1 ; Li, Xiaorong 1 ; Yang, Xi 1 ; Xue, Wanxin 1 ; Liu, Heng 1 ; He, Yuke 1 ;
作者机构： 1.Chinese Acad Sci, Shanghai Inst Plant Physiol & Ecol, Natl Lab Plant Mol Genet, Fenglin Rd 300, Shanghai 200032, Peoples R China
2.Chinese Acad Sci, Grad Sch, Shanghai 200032, Peoples R China
3.Chinese Acad Trop Agr Sci, South Subtrop Crop Res Inst, Minist Agr, Zhanjiang, Guangdong, Peoples R China
期刊名称：HORTICULTURE RESEARCH （ 影响因子：6.793； 五年影响因子：6.589 ）
ISSN： 2662-6810
年卷期： 2020 年 7 卷 1 期
页码：
收录情况： SCI
摘要： HYL1 (HYPONASTIC LEAVES 1) in Arabidopsis thaliana encodes a double-stranded RNA-binding protein needed for proper miRNA maturation, and its null mutant hyl1 shows a typical leaf-incurvature phenotype. In Chinese cabbage, BcpLH (Brassica rapa ssp. pekinensis LEAFY HEADS), a close homolog of HYL1, is differentially expressed in juvenile leaves, which are flat, and in adult leaves, which display extreme incurvature. BcpLH lacks protein-protein interaction domains and is much shorter than HYL1. To test whether BcpLH is associated with defects in microRNA (miRNA) biogenesis and leaf flatness, we enhanced and repressed the activity of BcpLH by transgenics and investigated BcpLH-dependent miRNAs and plant morphology. BcpLH promoted miRNA biogenesis by the proper processing of primary miRNAs. BcpLH downregulation via antisense decreased a specific subset of miRNAs and increased the activities of their target genes, causing upward curvature of rosette leaves and early leaf incurvature, concurrent with the enlargement, earliness, and round-to-oval shape transition of leafy heads. Moreover, BcpLH-dependent miRNAs in Chinese cabbage are not the same as HYL1-dependent miRNAs in Arabidopsis. We suggest that BcpLH controls a specific subset of miRNAs in Chinese cabbage and coordinates the direction, extent, and timing of leaf curvature during head formation in Brassica rapa.
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