Responses of common bean (Phaseolus vulgaris L.) germoplasm to Macrophomina phaseolina under irrigated and rainfed conditions inVeracruz, Mexico.
Fourexperiments were established at Isla and Cotaxtla, Veracruz,Méxicoto determine the reactions of 56 common beangenotypes to M. phaseolina under irrigated-rainfed conditionsand to identify resistant and stable-yielding germplasms underwater-stress conditions. The germplasm included differentorigins, genetic races, seed coat colors and genetic status andwas randomized in 7x8 lattice experimental designs and thengrown under irrigated and rainfed conditions (no irrigationthroughout the reproductive stage). Water stress promotedearlier physiological maturity and increased charcoal rotseverity; in addition, water stress reduced common bean grainyields. Through the four experiments TLP20/NT81, NGO99165, Negro Veracruz, A 774, and BAT 477 showed thehighest grain yields (more than 1000 kg ha-1) and the lowestcharcoal rot severity ratings, while Negro Otomí, 9457-43,NGO 99176, CNC 2, and VAX 2 showed an inverse behaviour.Drought Intensity Index varied through experiments althoughthe highest values were found at Isla (0.53 and 0.38 in 2000and 2001, respectively). No clear association between DroughtSusceptibility Index and charcoal rot severity or grain yieldwere found, but a negative relationship between grain yield andcharcoal rot severity was registered (r = -0.26*) en promedio.Although no clear associations were found, the genotypes withthe lowest M. phaseolina damages and the highest grain yieldsshowed low values of drought susceptibility index.
| Main Authors: | , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Universidad de Costa Rica
2004
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| Online Access: | https://revistas.ucr.ac.cr/index.php/agromeso/article/view/11928 |
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