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J Integr Plant Biol, 57 (12): 1078-1088, Research Article
Overexpression of potato miR482e enhanced plant sensitivity to Verticillium dahliae infection
Liu Yang1,2, Xiaoying Mu1, Chao Liu1, Jinghui Cai1, Ke Shi1, Wenjiao Zhu1 and Qing Yang1*
1College of Life Sciences, Nanjing Agricultural University, Nanjing, China
2Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, China
*Correspondence:
E-mail: qyang19@njau.edu.cn
Abstract

Verticillium wilt of potato is caused by the fungus pathogen Verticillium dahliae. Present sRNA sequencing data revealed that miR482 was in response to V. dahliae infection, but the function in potato is elusive. Here, we characterized potato miR482 family and its putative role resistance to Verticillium wilt. Members of the potato miR482 superfamily are variable in sequence, but all variants target a class of disease-resistance proteins with nucleotide binding site (NBS) and leucine-rich repeat (LRR) motifs. When potato plantlets were infected with V. dahliae, the expression level of miR482e was downregulated, and that of several NBS-LRR targets of miR482e were upregulated. Transgenic potato plantlets overexpressing miR482e showed hypersensitivity to V. dahliae infection. Using sRNA and degradome datasets, we validated that miR482e targets mRNAs of NBS-LRR disease-resistance proteins and triggers the production of trans-acting (ta)-siRNAs, most of which target mRNAs of defense-related proteins. Thus, the hypersensitivity of transgenic potato could be explained by enhanced miR482e and miR482e-derived ta-siRNA-mediated silencing on NBS-LRR-disease-resistance proteins. It is speculated that a miR482-mediated silencing cascade mechanism is involved in regulating potato resistance against V. dahliae infection and could be a counter defense action of plant in response to pathogen infection.

 

Yang L, Mu X, Liu C, Cai J, Shi K, Zhu W, Yang Q (2015) Overexpression of potato miR482e enhanced plant sensitivity to Verticillium dahliae infection. J Integr Plant Biol 57: 1078–1088 doi: 10.1111/jipb.12348

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Received: 23 January 2015      Published: 04 March 2015
© 2015 Institute of Botany, Chinese Academy of Sciences
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