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Journal of Integrative Agriculture  2020, Vol. 19 Issue (2): 551-560    DOI: 10.1016/S2095-3119(19)62655-9
Special Issue: 植物细菌真菌合辑Plant Bacteria/Fungus
Plant Protection Advanced Online Publication | Current Issue | Archive | Adv Search |
A new Curvularia lunata variety discovered in Huanghuaihai Region in China
CHANG Jia-ying1, LIU Shu-sen1, SHI Jie1, GUO Ning1, ZHANG Hai-jian1, CHEN Jie2 
1 Plant Protection Institute, Hebei Academy of Agricultural and Forestry Sciences/Key Laboratory of IPM on Crops in Northern Region of North China, Ministry of Agriculture and Rural Affairs/IPM Centre of Hebei Province, Baoding 071000, P.R.China
2 School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, P.R.China
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Abstract  
The purpose of this study was to identify the dominant pathogens of Curvularia leaf spot and their pathogenicity variation in Huanghuaihai Region of China in recent years.  In 2013 and 2016–2017, the occurrences of Curvularia leaf spots on maize were investigated in fields located in Henan, Hebei, Shandong, and Anhui provinces, and 292 fungi were isolated from diseased leaves.  These fungal isolates were subjected to morphological identification, and 232 isolates were found to have about 70% uncurved conidia and were identified as Curvularia lunata var.  Most of the conidia of 2 representative isolates, namely, HNWB-131 and HNWB-185, were oblong with parallel septations and were distinctly different from a reference isolate CX-3.  For further determination, the internal transcribed spacer (ITS), glyceraldehyde 3-phosphate dehydrogenase (GPDH), the large subunit (LSU), and translation elongation factor 1-alpha (EF1-α) sequences of HNWB-131, HNWB-185, and CX-3 were amplified and sequenced.  The results of sequence analysis showed that the 4 gene sequences from the 3 isolates had a similarity of more than 99% to C. lunata.  Based on the sequences of ITS and the combined data of the 4 genes, neighbor-joining trees were constructed for phylogenetic analysis.  The results indicated that these 3 isolates were clustered together with C. lunata. The expression of Clg2p and ClUrase genes in mycelia and conidia was significantly (P<0.05) higher in CX-3 than in HNWB-131 and HNWB-185.  This study found that the dominant pathogen of Curvularia leaf spot was a new variety of C. lunata with morphological variations in Huanghuaihai Region from 2013 to 2017.  The pathogenicity of the C. lunata var. was not significantly enhanced, and the expression of Clg2p and ClUrase genes of C. lunata var. was decreased.
Keywords:    
Received: 21 December 2018   Accepted: 18 January 2020
Fund: This work was supported by the earmarked fund for the China Agriculture Research System (CARS-02) and the National Key Research and Development Program of China (2017YFD0200400). We thank Prof. Yang Wenxiang, College of Plant Protection, Agricultural University of Hebei/Biological Control Center of Plant Diseases and Plant Pests of Hebei Province) for critical reading of the manuscript and useful discussions.
Corresponding Authors:  Correspondence SHI Jie, E-mail: shij99@163.com; CHEN Jie, E-mail: jiechen59@sjtu.edu.cn   
About author:  CHANG Jia-ying, E-mail: cjy198908@163.com;

Cite this article: 

CHANG Jia-ying, LIU Shu-sen, SHI Jie, GUO Ning, ZHANG Hai-jian, CHEN Jie . 2020.

A new Curvularia lunata variety discovered in Huanghuaihai Region in China
. Journal of Integrative Agriculture, 19(2): 551-560.

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