Phytosulfokine-α Promotes Root Growth by Repressing Expression of Pectin Methylesterase Inhibitor (PMEI) Genes in Medicago truncatula

查看全文 作　　者：Liangliang [1]Yu;Wenjun [1]Zhou;Danping [1]Zhang;Junhui [1]Yan;Li [1]Luo

机构地区：[1]Shanghai Key Lab of Bio-Energy Crops,School of Life Sciences,Shanghai University,Shanghai,200444,China

出　　处：《Phyton-International Journal of Experimental Botany》索引2020年第89卷第4期,共9页

基　　金：This work is supported by the National Natural Science Foundation of China(31500197). 摘　　要：Phytosulfokine-α(PSK-α),a sulfated pentapeptide with the sequence YIYTQ,is encoded by a small precursor gene family in Arabidopsis.PSK-αregulates multiple growth and developmental processes as a novel peptide hormone.Despite its importance,functions of PSK-αin M.truncatula growth remains unknown.In this study,we identified five genes to encode PSK-αprecursors in M.truncatula.All of these precursors possess conserved PSK-αsignature motif.Expression pattern analysis of these MtPSK genes revealed that each gene was expressed in a tissue-specific or ubiquitous pattern and three of them were remarkably expressed in root.Treatment of M.truncatula seedlings with synthetic PSK-αpeptide significantly promoted root elongation.In addition,expression analysis of downstream genes by RNA-seq and qRT-PCR assays suggested that PSK-αsignaling might regulate cell wall structure via PMEI-PME module to promote root cell growth.Taken together,our results shed light on the mechanism by which PSK-αpromotes root growth in M.truncatula,providing a new resource for improvement of root growth in agriculture. 关键词：Phytosulfokine-α PSK-α PMEI root growth Medicago truncatula

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Phytosulfokine-α Promotes Root Growth by Repressing Expression of Pectin Methylesterase Inhibitor (PMEI) Genes in Medicago truncatula

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