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Licensed Unlicensed Requires Authentication Published by De Gruyter July 5, 2017

Molecular characterization and functional analysis of a glutathione peroxidase gene from Aphelenchoides besseyi (Nematoda: Aphelenchoididae)

Bu-Yong Wang, Rong-Rong Wen and Ling Ma
From the journal Acta Parasitologica

Abstract

Aphelenchoides besseyi, the nematode agent of rice tip white disease, causes huge economic losses in almost all the rice-growing regions of the world. Glutathione peroxidase (GPx), an esophageal glands secretion protein, plays important roles in the parasitism, immune evasion, reproduction and pathogenesis of many plant-parasitic nematodes (PPNs). Therefore, GPx is a promising target for control A. besseyi. Here, the full-length sequence of the GPx gene from A. besseyi (AbGPx1) was cloned using the rapid amplification of cDNA ends method. The full-length 944 bp AbGPx1 sequence, which contains a 678 bp open reading frame, encodes a 225 amino acid protein. The deduced amino acid sequence of the AbGPxl shares highly homologous with other nematode GPxs, and showed the closest evolutionary relationship with DrGPx. In situ hybridization showed that AbGPx1 was constitutively expressed in the esophageal glands of A. besseyi, suggesting its potential roles in parasitism and reproduction. RNA interference (RNAi) was used to assess the functions of the AbGPx1 gene, and quantitative real-time PCR was used to monitor the RNAi effects. After treatment with dsRNA for 12 h, AbGPx1 expression levels and reproduction in the nematodes decreased compared with the same parameters in the control group; thus, the AbGPx1 gene is likely to be associated with the development, reproduction, and infection ability of A. besseyi. These findings may open new avenues towards nematode control.


These authors contributed equally to this work


Acknowledgments

This work was supported by the Special Fund for Forest-Scientific Research in the Public Interest (Grant No. 201304403-4), the Heilongjiang Province Natural Science Foundation of China (Grant NO. ZD201404) and the Fundamental Research Funds for the Central Universities ( Grant NO. 2572015AA09).

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Received: 2016-11-29
Revised: 2017-4-18
Accepted: 2017-4-20
Published Online: 2017-7-5
Published in Print: 2017-9-26

© 2017 W. Stefański Institute of Parasitology, PAS