The application of high-throughput AFLP's in assessing genetic diversity in Fusarium oxysporum f. sp cubense

被引:59
作者
Groenewald, Susan
Van den Berg, Noelani
Marasas, Walter F. O.
Viljoen, Altus [1 ]
机构
[1] Univ Pretoria, Dept Microbiol & Plant Pathol, FABI, ZA-0002 Pretoria, South Africa
[2] MRC, PROMEC, ZA-7505 Tygerberg, South Africa
来源
MYCOLOGICAL RESEARCH | 2006年 / 110卷
关键词
fusarium wilt; plant pathology; population diversity; vegetative compatibility;
D O I
10.1016/j.mycres.2005.10.004
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Fusarium oxysporum f. sp. cubense (Foc) is responsible for fusarium wilt of bananas. The pathogen consists of several variants that are divided into three races and 21 vegetative compatibility groups (VCGs). Several DNA-based techniques have previously been used to analyse the worldwide population of Foc, sometimes yielding results that were not always consistent. In this study, the high-resolution genotyping method of AFLP is introduced as a potentially effective molecular tool to investigate diversity in Foc at a genomewide level. The population selected for this study included Foc isolates representing different VCGs and races, isolates of F. oxysporum f. sp. dianthi, a putatively non-pathogenic biological control strain F. oxysporum (Fo47), and F. circinatum. High-throughput AFLP analysis was attained using five different infrared dye-labelled primer combinations using a two-dye model 4200s LI-COR automated DNA analyser. An average of approx. 100 polymorphic loci were scored for each primer pair using the SAGA(MX) automated AFLP analysis software. Data generated from five primer pair combinations were combined and subjected to distance analysis, which included the use of neighbour-joining and a bootstrap of 1000 replicates. A tree inferred from AFLP distance analysis revealed the polyphyletic nature of the Foc isolates, and seven genotypic groups could be identified. The results indicate that AFLP is a powerful tool to perform detailed analysis of genetic diversity in the banana pathogen Foc. (c) 2005 The British Mycological Society. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:297 / 305
页数:9
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