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MicroRNAs play important roles in regulating the rapid growth of the Phyllostachys edulis culm internode

文献类型： 外文期刊

作者： Wang, Kai-Li 1 ; Zhang, Yuanyuan 1 ; Zhang, Heng-Mu 3 ; Lin, Xin-Chun 4 ; Xia, Rui 1 ; Song, Lili 4 ; Wu, Ai-Min 1 ;

作者机构： 1.South China Agr Univ, State Key Lab Conservat & Utilizat Subtrop Agrobi, Guangzhou 510642, Peoples R China

2.South China Agr Univ, Coll Forestry & Landscape Architectures, Guangdong Key Lab Innovat Dev & Utilizat Forest P, Guangzhou 510642, Peoples R China

3.Zhejiang Acad Agr Sci, Inst Virol & Biotechnol, Hangzhou 310021, Peoples R China

4.Zhejiang A&F Univ, Sch Forestry & Biotechnol, State Key Lab Subtrop Silviculture, Linan 311300, Peoples R China

5.Guangdong Lab Lingnan Modern Agr, Guangzhou 510642, Peoples R China

关键词： degradome; hormone; internode; microRNA; Phyllostachys edulis; rapid growth

期刊名称：NEW PHYTOLOGIST （ 影响因子：10.152； 五年影响因子：10.476 ）

ISSN： 0028-646X

年卷期： 2021 年 231 卷 6 期

页码：

收录情况： SCI

摘要： Moso bamboo (Phyllostachys edulis) is a fast-growing species with uneven growth and lignification from lower to upper segments within one internode. MicroRNAs (miRNAs) play a vital role in post-transcriptional regulation in plants. However, how miRNAs regulate fast growth in bamboo internodes is poorly understood. In this study, one moso bamboo internode was divided during early rapid growth into four segments called F4 (bottom) to F1 (upper) and these were then analysed for transcriptomes, miRNAs and degradomes. The F4 segment had a higher number of actively dividing cells as well as a higher content of auxin (IAA), cytokinin (CK) and gibberellin (GA) compared with the F1 segment. RNA-seq analysis showed DNA replication and cell division-associated genes highly expressed in F4 rather than in F1. In total, 63 miRNAs (DEMs) were identified as differentially expressed between F4 and F1. The degradome and the transcriptome indicated that many downstream transcription factors and hormonal responses genes were modulated by DEMs. Several miR-target interactions were further validated by tobacco co-infiltration. Our findings give new insights into miRNA-mediated regulatory pathways in bamboo, and will contribute to a comprehensive understanding of the molecular mechanisms governing rapid growth.

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