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MicroRNA Sequencing Revealed Citrus Adaptation to Long-Term Boron Toxicity through Modulation of Root Development by miR319 and miR171

文献类型： 外文期刊

作者： Huang, Jing-Hao 1 ; Lin, Xiong-Jie 2 ; Zhang, Ling-Yuan 3 ; Wang, Xian-Da 2 ; Fan, Guo-Cheng 2 ; Chen, Li-Song 1 ;

作者机构： 1.Fujian Agr & Forestry Univ, Coll Resources & Environm, Inst Plant Nutr Physiol & Mol Biol, Fuzhou 350002, Fujian, Peoples R China

2.Fujian Acad Agr Sci, Pomol Inst, Fuzhou 350013, Fujian, Peoples R China

3.Fujian Univ Tradit Chinese Med, Fuzhou 350122, Fujian, Peoples R China

4.Fujian Agr & Forestry Univ, Coll Resources & Environm, Fujian Prov Key Lab Soil Environm Hlth & Regulat, Fuzhou 350002, Fujian, Peoples R China

5.Fujian Agr & Forestry Univ, Coll Resources & Environm, Higher Educ Key Lab Fujian Prov Soil Ecosyst Hlth, Fuzhou 350002, Fujian, Peoples R China

关键词： Citrus; microRNAs; boron toxicity; lateral root formation; stem cell maintenance

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：5.923； 五年影响因子：6.132 ）

ISSN： 1422-0067

年卷期： 2019 年 20 卷 6 期

页码：

收录情况： SCI

摘要： Boron (B) toxicity in Citrus is a common physiological disorder leading to reductions in both productivity and quality. Studies on how Citrus roots evade B toxicity may provide new insight into plant tolerance to B toxicity. Here, using Illumina sequencing, differentially expressed microRNAs (miRNAs) were identified in B toxicity-treated Citrus sinensis (tolerant) and C. grandis (intolerant) roots. The results showed that 37 miRNAs in C. grandis and 11 miRNAs in C. sinensis were differentially expressed when exposed to B toxicity. Among them, miR319, miR171, and miR396g-5p were confirmed via 5-RACE and qRT-PCR to target a myeloblastosis (MYB) transcription factor gene, a SCARECROW-like protein gene, and a cation transporting ATPase gene, respectively. Maintenance of SCARECROW expression in B treated Citrus roots might fulfill stem cell maintenance, quiescent center, and endodermis specification, thus allowing regular root elongation under B-toxic stress. Down-regulation of MYB due to up-regulation of miR319 in B toxicity-treated C. grandis roots might decrease the number of root tips, thereby dramatically changing root system architecture. Our findings suggested that miR319 and miR171 play a pivotal role in Citrus adaptation to long-term B toxicity by targeting MYB and SCARECROW, respectively, both of which are responsible for root growth and development.

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