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Soybean anthracnose caused by Colletotrichum species: Current status and future prospects
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Soybean anthracnose caused by Colletotrichum species: Current status and future prospects
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Journal Article
Soybean anthracnose caused by Colletotrichum species: Current status and future prospects
2021
Overview
Soybean (Glycine max) is one of the most important cultivated plants worldwide as a source of protein‐rich foods and animal feeds. Anthracnose, caused by different lineages of the hemibiotrophic fungus Colletotrichum, is one of the main limiting factors to soybean production. Losses due to anthracnose have been neglected, but their impact may threaten up to 50% of the grain production.
Taxonomy
While C. truncatum is considered the main species associated with soybean anthracnose, recently other species have been reported as pathogenic on this host. Until now, it has not been clear whether the association of new Colletotrichum species with the disease is related to emerging species or whether it is due to the undergoing changes in the taxonomy of the genus.
Disease symptoms
Typical anthracnose symptoms are pre‐ and postemergence damping‐off; dark, depressed, and irregular spots on cotyledons, stems, petioles, and pods; and necrotic laminar veins on leaves that can result in premature defoliation. Symptoms may evolve to pod rot, immature opening of pods, and premature germination of grains.
Challenges
As accurate species identification of the causal agent is decisive for disease control and prevention, in this work we review the taxonomic designation of Colletotrichum isolated from soybean to understand which lineages are pathogenic on this host. We also present a comprehensive literature review of soybean anthracnose, focusing on distribution, symptomatology, epidemiology, disease management, identification, and diagnosis. We consider the knowledge emerging from population studies and comparative genomics of Colletotrichum spp. associated with soybean providing future perspectives in the identification of molecular factors involved in the pathogenicity process.
Useful website
Updates on Colletotrichum can be found at http://www.colletotrichum.org/.
All available Colletotrichum genomes on GenBank can be viewed at http://www.colletotrichum.org/genomics/.
A revision of soybean anthracnose revealed that along with Colletotrichum truncatum, several other species of Colletotrichum are associated with soybean worldwide, revealing a knowledge gap in what we know about this disease so far.
