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Lineage-Specific Evolved MicroRNAs Regulating NB-LRR Defense Genes in Triticeae

文献类型： 外文期刊

作者： Zhang, Rongzhi 1 ; Zhang, Shujuan 1 ; Hao, Weiwei 4 ; Song, Guoqi 1 ; Li, Yulian 1 ; Li, Wei 1 ; Gao, Jie 1 ; Zheng, Yong 1 ;

作者机构： 1.Shandong Acad Agr Sci, Inst Crop Sci, Jinan 250100, Shandong, Peoples R China

2.Minist Agr, Key Lab Wheat Biol & Genet Improvement North Yell, Jinan 250100, Shandong, Peoples R China

3.Natl Engn Lab Wheat & Maize, Jinan 250100, Shandong, Peoples R China

4.Chinese Acad Sci, Inst Genet & Dev Biol, State Key Lab Plant Cell & Chromosome Engn, Beijing 100101, Peoples R China

关键词： microRNAs; disease resistance genes; miRNA target genes; miRNA expression; miRNA evolution

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 13 期

页码：

收录情况： SCI

摘要： Disease resistance genes encoding proteins with nucleotide binding sites and Leucine-Rich Repeat (NB-LRR) domains include many members involved in the effector-triggered immunity pathway in plants. The transcript levels of these defense genes are negatively regulated by diverse microRNAs (miRNAs) in angiosperms and gymnosperms. In wheat, using small RNA expression datasets and degradome datasets, we identified five miRNA families targeting NB-LRR defense genes in monocots, some of which arose in the Triticeae species era. These miRNAs regulate different types of NB-LRR genes, most of them with coil-coiled domains, and trigger the generation of secondary small interfering RNAs (siRNA) as a phased pattern in the target site regions. In addition to acting in response to biotic stresses, they are also responsive to abiotic stresses such as heat, drought, salt, and light stress. Their copy number and expression variation in Triticeae suggest a rapid birth and death frequency. Altogether, non-conserved miRNAs as conserved transcriptional regulators in gymnosperms and angiosperms regulating the disease resistance genes displayed quick plasticity including the variations of sequences, gene copy number, functions, and expression level, which accompanied with NB-LRR genes may be tune-regulated to plants in natural environments with various biotic and abiotic stresses.

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