Breeding beans for resistance to terminal drought in the Lowland tropics |
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Authors: | Mark A Frahm Juan Carlos Rosas Netzahualcoyotl Mayek-Pérez Ernesto López-Salinas Jorge A Acosta-Gallegos James D Kelly |
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Institution: | (1) Dept. of Crop and Soil Sci., Michigan State Univ., E. Lansing, MI, 48824;(2) EAP / Zamorano, P.O. Box 93, Tegucigalpa, Honduras;(3) Departamento de Química, Universidad Autónoma de Aguascalientes, Universidad 940, CP 20100 Aguascalientes, México;(4) INIFAP Campo Experimental Cotaxtla, Km 34 Carretera Veracruz-Córdoba, A. Postal 429, CP 91700 Veracruz, México;(5) INIFAP Campo Experimental Bajío, Km 6.5 Carretera Celaya-San Miguel de Allende, A. Postal 112, CP 38110 Celaya, México |
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Abstract: | In the lowland regions of Latin America, a large proportion of beans are sown at the beginning of a dry season where a guaranteed
terminal (end-of-season) drought will reduce yields. This study was undertaken to identify lines within two black bean recombinant
inbred line (RIL) populations with resistance to terminal drought. The two RIL populations were developed from crosses between
a drought resistant line, B98311 from Michigan, with TLP 19 and VAX 5, two lines from CIAT with improved disease resistance
and adaptation to growing conditions in Latin America. The RIL populations were evaluated in experiments conducted in Zamorano,
Honduras and Veracruz, Mexico under drought stress and well-watered (non-stress) treatments. Yields were reduced in each experiment
by drought and the fungal pathogen, Macrophomina phaseolina. Drought stress, disease pressure and low yields contributed to high coefficients of variation (CV), which made it difficult
to select superior lines. Selection was based on rank of geometric mean (GM) yield calculated from the yield in the stress
and non-stress treatments. One RIL, L88-63 ranked first in GM yield at both locations. Subsequent testing in Honduras and
Michigan confirmed the high yield potential and broad adaptation of L88-63. Breeding beans for drought resistance in lowland
tropical environments should also include breeding for resistance to M. phaseolina.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | geometric mean yield Macrophomina phaseolina Phaseolus vulgaris L terminal drought |
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