Journal Article

Genome-wide identification and analysis of TCP family genes in Medicago sativa reveal their critical roles in Na+/K+ homeostasis

Li, Lin, Yan, Jianping, Xu, Mingzhi, Qin, Shangqian, Liu, Yanrong, Zhang, Wanjun, Zhang, Mingxiao

2023

Overview

Background Medicago sativa is the most important forage world widely, and is characterized by high quality and large biomass. While abiotic factors such as salt stress can negatively impact the growth and productivity of alfalfa. Maintaining Na + /K + homeostasis in the cytoplasm helps reduce cell damage and nutritional deprivation, which increases a salt-tolerance of plant. Teosinte Branched1/ Cycloidea/ Proliferating cell factors (TCP) family genes, a group of plant-specific transcription factors (TFs), involved in regulating plant growth and development and abiotic stresses. Recent studies have shown TCPs control the Na + /K + concentration of plants during salt stress. In order to improve alfalfa salt tolerance, it is important to identify alfalfa TCP genes and investigate if and how they regulate alfalfa Na + /K + homeostasis. Results Seventy-one MsTCP s including 23 non-redundant TCP genes were identified in the database of alfalfa genome (C.V XinJiangDaYe), they were classified into class I PCF (37 members) and class II: CIN (28 members) and CYC/TB1 (9 members). Their distribution on chromosome were unequally. MsTCP s belonging to PCF were expressed specifically in different organs without regularity, which belonging to CIN class were mainly expressed in mature leaves. MsTCP s belongs to CYC/TB1 clade had the highest expression level at meristem. Cis-elements in the promoter of MsTCP s were also predicted, the results indicated that most of the MsTCP s will be induced by phytohormone and stress treatments, especially by ABA-related stimulus including salinity stress. We found 20 out of 23 MsTCP s were up-regulated in 200 mM NaCl treatment, and MsTCP3/14/15/18 were significantly induced by 10 μM KCl, a K + deficiency treatment. Fourteen non-redundant MsTCPs contained miR319 target site, 11 of them were upregulated in MIM319 transgenic alfalfa, and among them four ( MsTCP3/4/10A/B ) genes were directly degraded by miR319. MIM319 transgene alfalfa plants showed a salt sensitive phenotype, which caused by a lower content of potassium in alfalfa at least partly. The expression of potassium transported related genes showed significantly higher expression in MIM319 plants. Conclusions We systematically analyzes the MsTCP gene family at a genome-wide level and reported that miR319- TCPs model played a function in K + up-taking and/ or transportation especially in salt stress. The study provide valuable information for future study of  TCP  genes in alfalfa and supplies candidate genes for salt-tolerance alfalfa molecular-assisted breeding.

• Publisher: BioMed Central,BioMed Central Ltd,Springer Nature B.V,BMC
• Subject: Abiotic factors / Abiotic stress / Abscisic acid / Agricultural research / Agriculture / Alfalfa / Binding sites / biomass / Biomedical and Life Sciences / Cell division / Chromosomes / class / Cytoplasm / Damage tolerance / DNA binding proteins / Ecosystem components / family / forage / Gene expression / Gene Expression Regulation, Plant / Genes / Genes, Plant - genetics / Genetic aspects / Genetic engineering / Genetic transcription / genetically modified organisms / Genomes / Genomics / growth and development / Homeostasis / Leaves / Life Sciences / Medicago sativa / Medicago sativa - metabolism / Meristems / MIM319 / MsTCPs / Na+/K+ homeostasis / Nutrient deficiency / phenotype / Phenotypes / Phylogenetics / Physiological aspects / Plant growth / Plant hormones / Plant Sciences / Plants, Genetically Modified - genetics / potassium / Potassium - metabolism / Potassium channels / Potassium chloride / Proteins / Salinity / Salinity tolerance / salt stress / Salt stress (Botany) / Salt tolerance / Salt Tolerance - genetics / Senescence / Signal transduction / Sodium channels / Sodium chloride / Transcription factors / Transgenes / Transgenic plants / Transmission Control Protocol/Internet Protocol (Computer network protocol) / transportation / Tree Biology / Zea