Variation in virulence and resistance in the bean-bean rust pathosystem in Ecuador |
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Authors: | J Ochoa E Cruz A Murillo D L Danial |
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Institution: | (1) E.E. Santa Catalina, INIAP, Km 1, Panamericana Sur, Quito, Ecuador;(2) Lab. Plant Breeding, Dept. Plant Sci., PO Box 386, Wageningen, NL-6700, AL, The Netherlands |
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Abstract: | Twenty two Uromyces appendiculatus isolates were tested on 20 differential and 25 Ecuadorian Phaseolus vulgaris cultivars in the seedling stage. Based on the infection types 20 races could be discerned. The Ecuadorian cultivars differed
greatly in their reaction to the isolates, from resistant to only one isolate (`Red Small Garden') to resistant to all isolates
(’G2333‘). The isolates showed a wide range of virulence to the Ecuadorian cultivars, from virulent to only two cultivars
(isolate 13) to virulent to 21 cultivars (isolates 5 and 23).
Seven cultivars with a basically susceptible infection type appeared to differ greatly in quantitative resistance when tested
in three consecutive crop cycles. The disease severities in percentage leaf area affected averaged over the three cycles ranged
between 83.9% for ‘Red Small Garden’ and 13.1% for ‘INIAP-414’.
Race-specific resistance does not seem an advisable breeding strategy, but the quantitative resistance offers a good alternative. |
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Keywords: | Common bean Bean rust Pathogenicity Phaseolus vulgaris Partial resistance Quantitative resistance Race Race-specific resistance Uromyces appendiculatus Virulence |
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