RNA Polymerase III-Dependent BoNR8 and AtR8 lncRNAs Contribute to Hypocotyl Elongation in Response to Light and Abscisic Acid
文献类型： 外文期刊
作者： Zhang, Nan 1 ; Xu, Kai 1 ; Liu, Shengyi 2 ; Yan, Rong 1 ; Liu, Ziguang 3 ; Wu, Ying 1 ; Peng, Yifang 4 ; Zhang, Xiaoxu 1 ; Yukawa, Yasushi 5 ; Wu, Juan 1 ;
作者机构： 1.Northeast Forestry Univ, Coll Life Sci, Key Lab Saline Alkali Vegetat Ecol Restorat, Minist Educ, Harbin 150040, Peoples R China
2.Nagoya Univ, Dept Immunol, Grad Sch Med, Nagoya 466850, Japan
3.Heilongjiang Acad Agr Sci, Minist Agr & Rural Affairs, Key Lab Combining Farming & Anim Husb, Inst Anim Husb, Harbin 150040, Peoples R China
4.Qiqihar Univ, Coll Life Sci Agr & Forestry, Qiqihar 161006, Heilongjiang, Peoples R China
5.Nagoya City Univ, Grad Sch Sci, Nagoya 4678501, Japan
关键词： ABA signaling; Hypocotyl elongation; Light signaling; lncRNA; RNA polymerase III; RNA secondary structure
期刊名称：PLANT AND CELL PHYSIOLOGY （ 影响因子：4.9； 五年影响因子：5.7 ）
ISSN： 0032-0781
年卷期： 2023 年 64 卷 6 期
页码：
收录情况： SCI
摘要： Hypocotyl elongation is inhibited by light and promoted by darkness. The plant hormone abscisic acid (ABA) also inhibits hypocotyl elongation. However, details of the molecular mechanism that regulates the integrated effects of light and ABA signaling on hypocotyl elongation remain unclear. Long non-coding RNAs (lncRNAs; >200 nt) do not encode proteins but play many physiological roles in organisms. Until now, only a few lncRNAs related to hypocotyl elongation have been reported. The lncRNAs BoNR8 (272 nt) and AtR8 (259 nt), both of which are transcribed by RNA polymerase III, are homologous lncRNAs that are abundantly present in cabbage and Arabidopsis, respectively. These lncRNAs shared 77% sequence identity, and their predicted RNA secondary structures were similar; the non-conserved nucleotides in both sequences were positioned mainly in the stem-loop regions of the secondary structures. A previous study showed that BoNR8 regulated seed germination along with ABA and that AtR8 may be involved in innate immune function in Arabidopsis. Our results show that the expression levels of BoNR8 and AtR8 were differentially affected by light and ABA and that overexpression (OX) of both BoNR8 and AtR8 in Arabidopsis regulated hypocotyl elongation depending on light and ABA.. The expression levels of light-related genes PHYB, COP1, HY5 and PIF4 and ABA-related genes ABI3 and ABI5 were altered in the AtR8-OX and BoNR8-OX lines, and, in an ABI3-defective mutant, hypocotyl elongation was greatly increased under dark condition with the addition of ABA. These results indicate that BoNR8 and AtR8 regulate hypocotyl elongation together with ABI3 and key downstream light signaling genes.
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