TY - JOUR AU - Frahm, Mark AU - Rosas, Juan Carlos AU - Mayek, Netzahualcoyotl AU - López, Ernesto AU - Acosta, Jorge A. AU - Kelly, James D. PY - 2003/09/19 Y2 - 2024/03/29 TI - Resistance of tropical black beans to terminal drought. JF - Agronomía Mesoamericana JA - Agron. Mesoam. VL - 14 IS - 2 SE - Articles DO - 10.15517/am.v14i2.11942 UR - https://revistas.ucr.ac.cr/index.php/agromeso/article/view/11942 SP - 143-150 AB - <p>A pioneer collaboration between the breeding</p><p>programs in Honduras, Mexico and Michigan State</p><p>University (MSU) was designed to identify commercial black</p><p>bean cultivars exhibiting drought resistance adapted for</p><p>Central America and regions in Mexico. Two recombinant</p><p>inbred line (RIL) populations were developed from crosses</p><p>between a drought resistant line, B98311 from MSU, with</p><p>TLP 19 and VAX 5, two lines from CIAT with improved</p><p>disease resistance and adapted to the growing conditions in</p><p>Latin America. Both populations were tested (in Zamorano,</p><p>Honduras and Veracruz, Mexico) under drought stress and</p><p>non-stress conditions. Yields were reduced by drought stress</p><p>and Macrophomina phaseolina, the causal fungal pathogen of</p><p>charcoal rot. Drought stress, disease pressure and low yields</p><p>contributed to the high variation coefficients (VC), which</p><p>hindered the identification and selection for superior lines.</p><p>Selection was based on rank of the geometric mean (GM)</p><p>yield, calculated from the yield of each line in the stress and</p><p>non-stress treatments. The RIL, L88-63 ranked first in GM</p><p>yield at both locations. Subsequent testing in Honduras and</p><p>Michigan supported the high yield potential and broad</p><p>adaptation of L88-63. Breeding for drought resistance in</p><p>lowland tropical environments will require that additional</p><p>resistance to M. phaseolina be incorporated into potential</p><p>new bean lines being considered for release in this region.</p> ER -