The Nicotiana tabacum L. major latex protein-like protein 423 (NtMLP423) positively regulates drought tolerance by ABA-dependent pathway

BMC Plant Biology

Nini Cheng¹  Heng Liu²  Shaohua Liu²  Yuanhu Zhang²  Bingyang Du²  Xiaocen Ma²  Yong Wang² 

[1] Linyi University, 276005, Linyi, Shandong, P.R. China;State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, 271018, Taian, Shandong, P.R. China;

关键词: NtMLP423;    Drought stress;    ABA;    Nicotiana tabacum;   

DOI  :  10.1186/s12870-020-02690-z

来源: Springer

【 摘 要 】

BackgroundDrought stress is an environmental factor that limits plant growth and reproduction. Little research has been conducted to investigate the MLP gene in tobacco. Here, NtMLP423 was isolated and identified, and its role in drought stress was studied.ResultsOverexpression of NtMLP423 improved tolerance to drought stress in tobacco, as determined by physiological analyses of water loss efficiency, reactive oxygen species levels, malondialdehyde content, and levels of osmotic regulatory substances. Overexpression of NtMLP423 in transgenic plants led to greater sensitivity to abscisic acid (ABA)-mediated seed germination and ABA-induced stomatal closure. NtMLP423 also regulated drought tolerance by increasing the levels of ABA under conditions of drought stress. Our study showed that the transcription level of ABA synthetic genes also increased. Overexpression of NtMLP423 reduced membrane damage and ROS accumulation and increased the expression of stress-related genes under drought stress. We also found that NtWRKY71 regulated the transcription of NtMLP423 to improve drought tolerance.ConclusionsOur results indicated that NtMLP423-overexpressing increased drought tolerance in tobacco via the ABA pathway.

【 授权许可】

CC BY