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Identification and characterization of miRNAs associated with sterile flower buds in the tea plant based on small RNA sequencing

文献类型： 外文期刊

作者： Qu, Hao 1 ; Liu, Yue 1 ; Jiang, Huibing 1 ; Liu, Yufei 1 ; Song, Weixi 1 ; Chen, Linbo 1 ;

作者机构： 1.Yunnan Acad Agr Sci, Tea Res Inst, Menghai 666201, Xishuangbanna, Peoples R China

2.Yunnan Prov Key Lab Tea Sci, Menghai 666201, Xishuangbanna, Peoples R China

关键词： miRNA; Camellia sinensis; Sterile floral bud; Target genes

期刊名称：HEREDITAS （ 影响因子：3.271； 五年影响因子：2.807 ）

ISSN： 1601-5223

年卷期： 2021 年 158 卷 1 期

页码：

收录情况： SCI

摘要： Background miRNAs are a type of conserved, small RNA molecule that regulate gene expression and play an important role in the growth and development of plants. miRNAs are involved in seed germination, root development, shoot apical meristem maintenance, leaf development, and flower development by regulating various target genes. However, the role of miRNAs in the mechanism of tea plant flower sterility remains unclear. Therefore, we performed miRNA sequencing on the flowers of fertile male parents, female parents, and sterile offspring. Results A total of 55 known miRNAs and 90 unknown miRNAs were identified. In the infertile progeny, 37 miRNAs were differentially expressed; 18 were up-regulated and 19 were down-regulated. miR156, miR157, miR164, miR167, miR169, miR2111 and miR396 family members were down-regulated, and miR160, miR172 and miR319 family members were up-regulated. Moreover, we predicted that the 37 differentially expressed miRNAs target a total of 363 genes, which were enriched in 31 biological functions. We predicted that miR156 targets 142 genes, including ATD1A, SPL, ACA1, ACA2, CKB22 and MADS2. Conclusion We detected a large number of differentially expressed miRNAs in the sterile tea plant flowers, and their target genes were involved in complex biological processes. Among these miRNAs, the down-regulation of miR156 may be one of the factor in the formation of sterile floral buds in tea plants.

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