拟南芥
生物
MYB公司
拟南芥
小RNA
突变体
遗传学
细胞生物学
转录因子
基因
计算生物学
植物
作者
Wen-Qiu Wang,Xiao-fen Liu,Yong-jing Zhu,Jia-zhen Zhu,Chao Liu,Zhiye Wang,Xing‐Xing Shen,Andrew C. Allan,Yin X
标识
DOI:10.1093/plcell/koad315
摘要
Abstract MicroRNAs (miRNAs) are a class of non-protein-coding short transcripts that provide a layer of post-transcriptional regulation essential to many plant biological processes. MiR858, which targets the transcripts of MYB transcription factors, can affect a range of secondary metabolic processes. Although miR858 and its 187-nt precursor have been well studied in Arabidopsis (Arabidopsis thaliana), a systematic investigation of miR858 precursors and their functions across plant species is lacking due to a problem in identifying the transcripts that generate this sub-class. By re-evaluating the transcript of miR858 and relaxing the length cut-off for identifying hairpins, we found in kiwifruit (Actinidia chinensis) that miR858 has long-loop hairpins (1,100-2,100-nt), whose intervening sequences between miRNA generating complementary sites were longer than all previously reported miRNA hairpins. Importantly, these precursors of miR858 containing long-loop hairpins (termed MIR858L) are widespread in seed plants including Arabidopsis, varying between 350- and 5,500-nt. Moreover, we showed that MIR858L has a greater impact on proanthocyanidin and flavonol levels in both Arabidopsis and kiwifruit. We suggest that an active MIR858L-MYB regulatory module appeared in the transition of early land plants to large upright flowering plants, making a key contribution to plant secondary metabolism.
科研通智能强力驱动
Strongly Powered by AbleSci AI