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The cytokinin type-B response regulator PeRR12 is a negative regulator of adventitious rooting and salt tolerance in poplar

文献类型: 外文期刊

作者: Qi, Haoran 1 ; Cai, Heng 1 ; Liu, Xin 1 ; Liu, Sian 1 ; Ding, Changjun 3 ; Xu, Meng 1 ;

作者机构: 1.Nanjing Forestry Univ, Coinnovat Ctr Sustainable Forestry Southern China, Key Lab Forest Genet & Biotechnol, Minist Educ, Nanjing 210037, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Pomol, Nanjing 210014, Peoples R China

3.Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Key Lab Tree Breeding & Cultivat State Forestry Ad, Beijing 100091, Peoples R China

关键词: Cytokinin type -B response regulator; Transgenic poplar; Adventitious root; Salt tolerance

期刊名称:PLANT SCIENCE ( 影响因子:5.363; 五年影响因子:5.454 )

ISSN: 0168-9452

年卷期: 2022 年 325 卷

页码:

收录情况: SCI

摘要: Adventitious root (AR) development is an ecologically and economically important biological process that maintains ecological balance, improves plant survivability, and allows for massive vegetative propagation, but its genetic mechanisms are not well understood. Here, eight Arabidopsis response regulator (ARR) genes were cloned and identified in poplar, most of which were detected in the AR, phloem, and xylem and showed remarkable induction at different time points during AR development. Subcellular localization indicated that most of these PeRR genes are in the nucleus. Based on qRT-PCR expression analysis of some genes related to AR development, we inferred that overexpression of PeRR12 (OE_PeRR12) may inhibited AR formation by suppressing the transcription of PeWOX11, PeWOX5, PePIN1 and PePIN3 in poplar while promoting type-A RR transcripts. Correspondingly, exogenous auxin partially restored the rooting of OE_PeRR12 poplar by inhibiting PeRR12 expression. Moreover, the activities of the antioxidant systems of OE_PeRR12 poplars were lower than those of wild-type poplars under salt stress conditions, indicating that PeRR12 may acts as a repressor that mediates salt tolerance by suppressing the expression of PeHKT1;1. Altogether, these results suggest that PeRR12 plays essential roles in mediating AR formation and salinity tolerance in poplar.

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