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The laccase gene (LAC1) is essential for Colletotrichum gloeosporioides development and virulence on mango leaves and fruits

文献类型： 外文期刊

作者： Wei, Yunxie 1 ; Pu, Jinji 3 ; Zhang, He; Liu, Yanan 1 ; Zhou, Fangxue 1 ; Zhang, Kaili 1 ; Liu, Xiaomei 1 ;

作者机构： 1.Hainan Univ, Trop Agr & Forestry Inst, Haikou 570228, Hainan, Peoples R China

2.Hainan Univ, Minist Educ, Key Lab Protect & Dev Utilizat Trop Crop Germplas, Haikou 570228, Hainan, Peoples R China

3.Chinese Acad Trop Agr Sci, Environm & Plant

关键词： Colletotrichum gloeosporioides;Laccase;Mangifera indica;Appressorium;Virulence

期刊名称：PHYSIOLOGICAL AND MOLECULAR PLANT PATHOLOGY （ 影响因子：2.747； 五年影响因子：2.388 ）

ISSN： 0885-5765

年卷期： 2017 年 99 卷

页码：

收录情况： SCI

摘要： Colletotrichum gloeosporioides is the main causal agent of anthracnose of mango (Mangifera indica), which has great economic impact on mango industry worldwide. Laccase has versatile biological functions including: melanin biosynthesis and pathogenicity in several other pathogenic fungi. A laccase gene LAC1, homologous to C. lagenarium laccase, was cloned from C. gloeosporioides. To evaluate its role, LAC1 was disrupted via gene replacement, and the mutant Delta lac1 was analyzed. Compared with the wild-type, the Dlac1 mutant had less pigmentation and dramatically reduced aerial mycelial mass and radial growth rates, and rarely produces conidia in vitro. Microscopic observation showed that Dlac1 hyphae were lighter in color, less branched and septated with obviously more condensed protoplasm than wild-type. The Dlac1 mutant was obviously different in nutritional utilization compared with the wild-type. Virulence tests showed that Dlac1 mycelia were weakly virulent on non-wounded mango leaves and fruits, and was significantly less virulent on wounded mango leaves and fruits. The Dlac1 produced less extracellular cell wall-degrading enzymes (CWDE) and no detectable extracellular laccase activity in vitro. These results suggest that the C. gloeosporioides LAC1 laccase is involved not only in virulence, but also in mycelial growth and differentiation, conidiation, appressorium formation, pigmentation, melanin biosynthesis, secretion of extracellular hydrolytic enzymes, and utilization of exogenous nutrition. (C) 2017 Elsevier Ltd. All rights reserved.

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