Resistance to ascochyta blights of cool season food legumes |
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| Authors: | Fred J Muehlbauer Weidong Chen |
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| Institution: | (1) U.S. Department of Agriculture, Agricultural Research Service, Washington State University, 303 Johnson Hall, Pullman, WA 99164-6434, USA |
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| Abstract: | Ascochyta blights are the most important diseases of cool season food legumes (peas, lentils, chickpeas, and faba beans) and
are found in nearly all production regions. Despite having the same common disease name, the pathogen species differ for each
of the crops. These diseases cause serious yield losses under favourable cool and humid conditions. Planting resistant cultivars
is often the first choice and most economical means in managing the diseases. Therefore breeding for resistance to ascochyta
blights has been an important objective of many cool season food legume research programmes. Systematic screening of germplasm
collections at international research centres and other national research programmes have identified useful resistance sources
that have been used successfully to breed resistant or tolerant cultivars. Genetic studies have revealed inheritance patterns
of the resistance genes. Genetic linkage analyses and QTL mapping have identified molecular markers that could be useful for
marker-assisted selection and gene pyramiding. In general, research towards developing resistance to ascochyta blights in
cool season food legume faces mainly two limitations: the lack of availability of efficient resistance sources and the lack
of a good understanding of the variability of the pathogen populations. Research efforts to alleviate these limitations should
be pursued. Given that modern technologies of marker development and genomics are available, further advances in deploying
resistance to manage ascochyta blights in this group of legume crops will depend on concerted efforts in developing accurate
screening procedures with adequate knowledge of pathogen variability and identification of additional sources of resistance. |
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| Keywords: | Disease resistance Quantitative trait loci Marker assisted selection Disease screening Inheritance Breeding for disease resistance Pisum sativum Peas Lens culinaris Lentil Cicer arietinum Chickpea Vicia faba Faba bean |
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