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Variability of Colletotrichum spp in common bean.
S F Mota1, Q L Barcelos1, M A Dias1
1Departamento de Biologia, Universidade Federal de Lavras, Lavras, MG, Brasil.
Genetics and Molecular Research : GMR
|May 14, 2016
Summary
This study reveals significant genetic variability within Colletotrichum species affecting common beans. Understanding this diversity is crucial for developing effective anthracnose and scab disease management strategies.
Area of Science:
- Plant Pathology
- Mycology
- Molecular Biology
Background:
- The Colletotrichum genus exhibits substantial genetic variability, leading to diverse pathogenic races and phenotypic traits.
- Anthracnose and bean scab are significant diseases impacting common bean production, caused by Colletotrichum species.
Purpose of the Study:
- To characterize 22 strains of C. lindemuthianum and Colletotrichum spp.
- To investigate the relationships between Colletotrichum species found on anthracnose and scab lesions.
- To assess genetic and physiological traits for disease management insights.
Main Methods:
- Analysis of colony morphology, conidium characteristics, germination, sporulation, and mycelium growth rates.
- Molecular analysis using Inter-Retrotransposon Amplified Polymorphism (IRAP) markers.
- Pathogenicity tests to evaluate disease severity over time.
Main Results:
- Colletotrichum spp. strains displayed wide variations across all evaluated traits, suggesting the presence of multiple species.
- Pathogenicity tests indicated that disease severity should be assessed 17 days post-inoculation.
- Molecular analysis revealed that only C. lindemuthianum strains clustered together using IRAP markers.
- Physiological analysis showed slower mycelium growth in C. lindemuthianum compared to other Colletotrichum spp.
Conclusions:
- The study confirms significant variability within the evaluated Colletotrichum species.
- Findings provide a basis for future research on controlling anthracnose and bean scab in common beans.
- Understanding strain diversity is key for developing targeted disease management strategies.
