Overexpression of Mtr-miR319a Contributes to Leaf Curl and Salt Stress Adaptation in Arabidopsis thaliana and Medicago truncatula
文献类型: 外文期刊
第一作者: Li, Mingna
作者: Li, Mingna;Xu, Lei;Zhang, Lixia;Li, Xiao;Cao, Chunyu;Chen, Lin;Kang, Junmei;Yang, Qingchuan;Liu, Yajiao;Sod, Bilig;Long, Ruicai
作者机构:
关键词: Medicago truncatula; miR319; salt tolerance; TCP; leaf curl
期刊名称:INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES ( 影响因子:5.6; 五年影响因子:6.2 )
ISSN:
年卷期: 2023 年 24 卷 1 期
页码:
收录情况: SCI
摘要: Salt stress is a worldwide agronomic issue that limits crop yield and quality. Improving salt stress tolerance via genetic modification is the most efficient method to conquer soil salinization problems in crops. Crop miRNAs have been declared to be tightly associated with responding and adapting to salt stress and are advantageous for salt tolerance modification. However, very few studies have validated vital salt tolerance miRNAs and coupled potent target genes in Medicago species, the most economically important forage legume species. In this study, Mtr-miR319a, a miRNA that was identified from the previous next-generation sequencing assay of salt-treated Medicago truncatula, was overexpressed in M. truncatula and Arabidopsis thaliana, inducing the curly leaves and salt stress tolerance phenotypes. Combining the elevated expression level of Mtr-miR319a in the M. truncatula overexpression lines under normal and salt-treatment conditions, the regulatory roles of Mtr-miR319a in leaf development and salt stress adaptation were demonstrated. Several predicted target genes of Mtr-miR319a were also regulated by Mtr-miR319a and were associated with the aforementioned phenotypes in M. truncatula plants, most notably MtTCP4. Our study clarified the functional role of Mtr-miR319a and its target genes in regulating leaf development and defending salt stress, which can help to inform crop breeding efforts for improving salt tolerance via genetic engineering.
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