茶树果胶甲酯酶及其抑制子家族基因的鉴定及CsPME55参与氟胁迫响应的功能分析OA北大核心CSTPCD

Tea plant(Camellia sinensis)has fluoride(F)enrichment characteristics,and F is mainly enriched in the cell wall component pectin.Pectin methylsterase(PME)and its inhibitor PMEI can catalyze the modification of pectin,thereby affecting cell wall characteristics and participating in the regulation of processes like plant growth and development,stress response and so on.In this study,85 CsPMEs and 56 CsPMEIs were identified from the C.sinensis'Shuchazao'genome,which were divided into 4 and 5 subgroups,respectively.Distinct subgroups may exhibit functional distinction due to varied gene architectures,conserved motifs and expression patterns.Quantitative real-time PCR(qRT-PCR)analysis reveals that the expression levels of CsPME3a,CsPME55,CsPMEI1 and CsPMEI3 were significantly induced in the mature leaves of'Fuding Dabaicha'under F treatment.Moreover,overexpression of CsPME55 alleviated Arabidopsis root growth inhibition induced by F stress,suggesting its potential role in F stress regulation in tea plants.These findings could pave the way for further research on the functional involvement of PME and PMEI gene families in F response.