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Genome-wide characterization of LBD transcription factors in switchgrass (Panicum virgatum L.) and the involvement of PvLBD12 in salt tolerance

文献类型： 外文期刊

作者： Guan, Cong 1 ; Wu, Bo 1 ; Ma, Shu 1 ; Zhang, Jinhong 1 ; Liu, Xuesi 4 ; Wang, Hui 4 ; Zhang, Jinglei 1 ; Gao, Run 1 ; Jiang, Huixin 5 ; Jia, Chunlin 1 ;

作者机构： 1.Shandong Acad Agr Sci, Inst Leisure Agr, Jinan 250100, Peoples R China

2.Minist Agr, Key Lab East China Urban Agr, Jinan 250100, Peoples R China

3.Shandong Engn Res Ctr Ecol & Hort Plant Breeding, Jinan 250100, Peoples R China

4.China Agr Univ, Coll Grassland Sci & Technol, 2 Yuan Mingyuan West Rd, Beijing 100193, Peoples R China

5.Shandong Prov Anim Husb Gen Stn, Jinan, Peoples R China

关键词： Switchgrass; Lateral organ boundaries domain; PvLBD12; Salt stress; Proline; ROS-scavenging enzyme

期刊名称：PLANT CELL REPORTS （ 影响因子：6.2； 五年影响因子：5.9 ）

ISSN： 0721-7714

年卷期： 2023 年

页码：

收录情况： SCI

摘要： Key messagePvLBD12 enhanced the salt tolerance by increasing proline accumulation, improving K+ accumulation, and decreasing reactive oxygen species level in switchgrass.Abiotic stresses are the serious factors which limit plant development and productivity and restrict the agricultural economy. It is important, therefore, to understand the mechanism of abiotic tolerance in plants. Lateral organ boundaries domain (LBD) proteins as plant-specific transcription factors play important function in plant lateral organ development, plant regeneration, and abiotic stress. In our study, we identify 69 LBD members from switchgrass genome-wide sequences and classify them based on their homology with LBD proteins in Arabidopsis. RT-qPCR showed that PvLBD genes had different expression patterns under abiotic stress conditions, indicating that they play important roles in various stress. PvLBD12 was selected as a candidate gene for further functional analysis because it had the highest expression level under salt stress. Overexpression of PvLBD12 enhanced salt tolerance by altering a wide range of physiological responses (like increased proline accumulation, reduced malondialdehyde production, improved K+ accumulation, and reduced Na+ absorption) in switchgrass. Some stress response genes such as proline biosynthesis gene PvP5CS1, vacuolar Na+(K+)/H+ antiporter gene PvNHX1, two key ROS-scavenging enzyme genes PvCAT and PvSOD were all upregulated in PvLBD12 overexpression lines. Taken together, PvLBD12 plays a pivotal role in response to salt stress by increasing proline accumulation, improving K+ accumulation, reducing Na+ absorption, and decreasing reactive oxygen species level. It will be better to understand the potential biological functions of LBD genes in other plants.

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