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Diagnostics, genetic diversity and pathogenic variation of ascochyta blight of cool season food and feed legumes

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Ascochyta blights of grain legumes

Abstract

Molecular diagnostic techniques have been developed to differentiate the Ascochyta pathogens that infect cool season food and feed legumes, as well as to improve the sensitivity of detecting latent infection in plant tissues. A seed sampling technique was developed to detect a 1% level of infection by Ascochyta rabiei in commercial chickpea seed. The Ascochyta pathogens were shown to be genetically diverse in countries where the pathogen and host have coexisted for a long time. However, where the pathogen was recently introduced, such as A. rabiei to Australia, the level of diversity remained relatively low, even as the pathogen spread to all chickpea-growing areas. Pathogenic variability of A. rabiei and Ascochyta pinodes pathogens in chickpea and field pea respectively, appears to be quantitative, where measures of disease severity were based on aggressiveness (quantitative level of infection) rather than on true qualitative virulence. In contrast, qualitative differences in pathogenicity in lentil and faba bean genotypes indicated the existence of pathotypes of Ascochyta lentis and Ascochyta fabae. Therefore, reports of pathotype discrimination based on quantitative differences in pathogenicity in a set of specific genotypes is questionable for several of the ascochyta-legume pathosystems such as A. rabiei and A. pinodes. This is not surprising since host resistance to these pathogens has been reported to be mainly quantitative, making it difficult for the pathogen to overcome specific resistance genes and form pathotypes. For robust pathogenicity assessment, there needs to be consistency in selection of differential host genotypes, screening conditions and disease evaluation techniques for each of the Ascochyta sp. in legume-growing countries throughout the world. Nevertheless, knowledge of pathotype diversity and aggressiveness within populations is important in the selection of resistant genotypes.

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Authors and Affiliations

  1. Centre for Plant Health/BioMarka, School of Agriculture and Food Systems, Faculty of Land and Food Resources, The University of Melbourne, Parkville, Melbourne, VIC, 3010, Australia

    Paul W. J. Taylor & Rebecca Ford

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  1. Paul W. J. Taylor
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  2. Rebecca Ford
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Correspondence to Paul W. J. Taylor .

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Bernard Tivoli Alain Baranger Fred J. Muehlbauer B. M. Cooke

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Taylor, P.W.J., Ford, R. (2007). Diagnostics, genetic diversity and pathogenic variation of ascochyta blight of cool season food and feed legumes. In: Tivoli, B., Baranger, A., Muehlbauer, F.J., Cooke, B.M. (eds) Ascochyta blights of grain legumes. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6065-6_13

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