Transcription factor DIVARICATA1 positively modulates seed germination in response to salinity stress

Author:

Zhang Da1ORCID,He Tan1ORCID,Wang Xumin2ORCID,Zhou Chenchen1ORCID,Chen Youpeng1ORCID,Wang Xin1ORCID,Wang Shixiang1ORCID,He Shuangcheng1ORCID,Guo Yuan1ORCID,Liu Zijin1ORCID,Chen Mingxun1ORCID

Affiliation:

1. State Key Laboratory for Crop Stress Resistance and High-Efficiency Production, National Yangling Agricultural Biotechnology & Breeding Center, Shaanxi Key Laboratory of Crop Heterosis, and College of Agronomy, Northwest A&F University , Yangling 712100, Shaanxi , China

2. Ningxia Agricultural Technology Extension Station , Yinchuan 750001, Ningxia , China

Abstract

Abstract Seed germination is a critical checkpoint for plant growth under unfavorable environmental conditions. In Arabidopsis (Arabidopsis thaliana), the abscisic acid (ABA) and gibberellic acid (GA) signaling pathways play important roles in modulating seed germination. However, the molecular links between salinity stress and ABA/GA signaling are not well understood. Herein, we showed that the expression of DIVARICATA1 (DIV1), which encodes a MYB-like transcription factor, was induced by GA and repressed by ABA, salinity, and osmotic stress in germinating seeds. DIV1 positively regulated seed germination in response to salinity stress by directly regulating the expression of DELAY OF GERMINATION 1-LIKE 3 (DOGL3) and GA-STIMULATED ARABIDOPSIS 4 (GASA4) and indirectly regulating the expression of several germination-associated genes. Moreover, NUCLEAR FACTOR-YC9 (NF-YC9) directly repressed the expression of DIV1 in germinating seeds in response to salinity stress. These results help reveal the function of the NF-YC9–DIV1 module and provide insights into the regulation of ABA and GA signaling in response to salinity stress during seed germination in Arabidopsis.

Funder

National Key Research and Development Program of China

Scientific and Technological Innovation Team of Shaanxi Province

Key Research and Development Program of Shaanxi Province

Yang Ling Seed Industry Innovation Center

Publisher

Oxford University Press (OUP)

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