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Abscisic acid-dependent PMT1 expression regulates salt tolerance by alleviating abscisic acid-mediated reactive oxygen species production in Arabidopsis

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Journal of Integrative Plant Biology 2022年第9期64卷 1803-1820页

作者： Qi Yu He Jian Feng Jin He Qiang Lou Feng Feng Dang Ji Ming Xu Shao Jian Zheng Jian Li Yang State Key Laboratory of Plant Physiology and Biochemistry College of Life SciencesZhejiang UniversityHangzhou310058 China State Key Laboratory of Subtropical Silviculture Zhejiang A&F UniversityHangzhou311300 China State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources South China Agricultural UniversityGuangzhou510642 China

Phosphocholine(PCho)is an intermediate metabolite of nonplastid plant membranes that is essential for salt tolerance.However,how PCho metabolism modulates response to salt stress remains unknown.Here,we characterize the role of phosphoethanolamine n-methyltransferase 1(PMT1)in salt stress tolerance in Arabidopsis thaliana using a T-DnA insertional mutant,geneediting alleles,and complemented lines.The pmt1 mutants showed a severe inhibition of root elongation when exposed to salt stress,but exogenous ChoCl or lecithin rescued this defect.pmt1 also displayed altered glycerolipid metabolism under salt stress,suggesting that glycerolipids contribute to salt tolerance.Moreover,pmt1 mutants exhibited altered reactive oxygen species(ROS)accumulation and distribution,reduced cell division activity,and disturbed auxin distribution in the primary root compared with wild-type seedlings.We show that PMT1 expression is induced by salt stress and relies on the abscisic acid(ABA)signaling pathway,as this induction was abolished in the aba2-1 and pyl112458 mutants.However,ABA aggravated the salt sensitivity of the pmt1 mutants by perturbing ROS distribution in the root tip.Taken together,we propose that PMT1 is an important phosphoethanolamine n-methyltransferase participating in root development of primary root elongation under salt stress conditions by balancing ROS production and distribution through ABA signaling.

关键词： abscisic acid(ABA) oxidative stress plasma membrane phosphoethanolamine n-methyltransferase phospholipid metabolism salt stress

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