Genetic Diversity and Recombination in the Plant Pathogen Sclerotinia sclerotiorum Detected in Sri Lanka

is an important fungal pathogen on many economically important crops including cabbage worldwide. Even though population structure and genetic diversity of is well studied in temperate climatic conditions, only a few studies have been conducted in tropical countries. It is also not clear whether the...

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Bibliographic Details
Published in:Pathogens (Basel) 2020-04, Vol.9 (4), p.306
Main Authors: Mahalingam, Thirega, Chen, Weidong, Rajapakse, Chandima Shashikala, Somachandra, Kandangamuwa Pathirannahalage, Attanayake, Renuka Nilmini
Format: Article
Language:English
Subjects:
Brassica
Brassica oleracea
cabbage
Climatic conditions
Cloning
Compatibility
Economic importance
Fungicides
Genetic analysis
Genetic diversity
Genetic markers
Genetic structure
Haplotypes
Heterozygosity
Hypotheses
Infections
Microsatellites
Mycelia
mycelial compatibility grouping
Pathogens
Pesticides
Population
Population genetics
Population structure
Recombination
Sclerotinia sclerotiorum
Structural analysis
Studies
Tropical environments
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Summary:is an important fungal pathogen on many economically important crops including cabbage worldwide. Even though population structure and genetic diversity of is well studied in temperate climatic conditions, only a few studies have been conducted in tropical countries. It is also not clear whether the populations are clonal or recombining in the tropics. In filling this information gap, 47 isolates of were collected from commercial cabbage ( L.) fields in Nuwara Eliya district of Sri Lanka, where the disease has been previously reported. All the isolates were subjected to genetic diversity study using mycelial compatibility grouping and microsatellite markers. Fourteen mycelial compatibility groups (MCGs) and 23 multilocus haplotypes (MLHs) were recorded. Mean expected heterozygosity of the population was 0.56. MLHs were weakly correlated with MCGs. Population genetic structure analysis and principal coordinates identified three genetic clusters. Genetic recombination was inferred within each genetic cluster when isolates were subjected to clone correction. There was evidence of multiple infections on single plant as detected by the presence of more than one MCG on each cabbage plant. However, multiple infections did not increase the disease severity in detached leaf assay. We found high genetic diversity and recombination of population in a tropical country, Sri Lanka. Importance of detecting genetic structure when inferring recombination was also highlighted.
ISSN:2076-0817
2076-0817
DOI:10.3390/pathogens9040306