title: The remodeling of seedling development in response to long-term magnesium toxicity and regulation by ABA-DELLA signaling in Arabidopsis.
abstract: Little information is available about signaling response to magnesium toxicity (MgT) in plants. This study presents the first evidence that abscisic acid (ABA) and DELLA proteins participate in signaling response to long-term MgT in Arabidopsis thaliana (Landsberg erecta). Morphological, physiological, and molecular characteristics of a wild-type and two Arabidopsis mutants, ABA-insensitive mutant abi1-1 and constitutive elevated GA response mutant quadruple-DELLA (DELLA-Q: gai-t6 rga-t2 rgl1-1 rgl2-1) were monitored under MgT and normal magnesium conditions. Two weeks of MgT treatment strongly influenced the growth of young plants, but growth inhibition of the DELLA-Q and abi1-1 mutants was less than that of the wild-type plants. Exogenous ABA further inhibited the growth of the DELLA-Q mutants, similar to that of the wild-type. Both ABA and MgT also promoted DELLA protein RGA accumulation in the nuclei. Transcriptional analysis supported these results and revealed that a complex signaling network has responded to MgT in Arabidopsis. DELLA enhancement, which depends on ABI1, contributed to the remodeling growth and development of young seedlings.
authors: College of Life Science, Zhejiang Sci-Tech University, Xiasha Campus, Hangzhou, 310018 China These authors contributed equally to this work.
authors: Wanli
authors: W
authors: Guo
authors: Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, 866 Yu-Hang-Tang Road, Hangzhou 310058 China These authors contributed equally to this work.
authors: Yuexi
authors: Y
authors: Cong
authors: Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, 866 Yu-Hang-Tang Road, Hangzhou 310058 China.
authors: Nazim
authors: N
authors: Hussain
authors: Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, 866 Yu-Hang-Tang Road, Hangzhou 310058 China.
authors: Yu
authors: Y
authors: Wang
authors: Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, 866 Yu-Hang-Tang Road, Hangzhou 310058 China.
authors: Zhongli
authors: Z
authors: Liu
authors: Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, 866 Yu-Hang-Tang Road, Hangzhou 310058 China.
authors: Lixi
authors: L
authors: Jiang
authors: College of Life Science, Zhejiang Sci-Tech University, Xiasha Campus, Hangzhou, 310018 China.
authors: Zongsuo
authors: Z
authors: Liang
authors: State Key Laboratory of Crop Stress Biology in Arid Area, College of Life Sciences, Northwest A&F University, Yangling 712100 China kunmingchen@nwsuaf.edu.cn.
authors: Kunming
authors: K
authors: Chen
mesh_terms: D000040:Abscisic Acid / Q000378:metabolism*; D017360:Arabidopsis / Q000254:growth & development / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000378:metabolism*; D008274:Magnesium / Q000633:toxicity*; D012639:Seeds / Q000254:growth & development*; D015398:Signal Transduction; D013213:Starch / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; C109555:GAI protein, Arabidopsis; D000040:Abscisic Acid; D013213:Starch; D008274:Magnesium
keywords: ABA; ABI1; Arabidopsis; DELLA proteins; Magnesium toxicity; Seedling development