Cytokinin Type-B Response Regulators Promote Bulbil Initiation in Lilium lancifolium

文献类型： 外文期刊

第一作者： He, Guoren

作者： He, Guoren;Yang, Panpan;Cao, Yuwei;Tang, Yuchao;Song, Meng;Wang, Jing;Xu, Leifeng;Ming, Jun;Wang, Ling

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关键词： Lilium lancifolium; cytokinin; bulbil formation; type-B response regulators

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：4.556； 五年影响因子：4.653 ）

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年卷期： 2021 年 22 卷 7 期

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收录情况： SCI

摘要： The bulbil is an important vegetative reproductive organ in triploid Lilium lancifolium whose development is promoted by cytokinins. Type-B response regulators (RRs) are critical regulators that mediate primary cytokinin responses and promote cytokinin-induced gene expression. However, the function of cytokinin type-B Arabidopsis RRs (ARRs) in regulating bulbil formation is unclear. In this study, we identified five type-B LlRRs, LlRR1, LlRR2, LlRR10, LlRR11 and LlRR12, in L. lancifolium for the first time. The five LlRRs encode proteins of 715, 675, 573, 582 and 647 amino acids. All of the regulators belong to the B-I subfamily, whose members typically contain a conserved CheY-homologous receiver (REC) domain and an Myb DNA-binding (MYB) domain at the N-terminus. As transcription factors, all five type-B LlRRs localize at the nucleus and are widely expressed in plant tissues, especially during axillary meristem (AM) formation. Functional analysis showed that type-B LlRRs are involved in bulbil formation in a functionally redundant manner and can activate LlRR9 expression. In summary, our study elucidates the process by which cytokinins regulate bulbil initiation in L. lancifolium through type-B LlRRs and lays a foundation for research on the molecular mechanism of bulbil formation in the lily.

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