Resistance of tropical black beans to terminal drought.
DOI:
https://doi.org/10.15517/am.v14i2.11942Abstract
A pioneer collaboration between the breeding
programs in Honduras, Mexico and Michigan State
University (MSU) was designed to identify commercial black
bean cultivars exhibiting drought resistance adapted for
Central America and regions in Mexico. Two recombinant
inbred line (RIL) populations were developed from crosses
between a drought resistant line, B98311 from MSU, with
TLP 19 and VAX 5, two lines from CIAT with improved
disease resistance and adapted to the growing conditions in
Latin America. Both populations were tested (in Zamorano,
Honduras and Veracruz, Mexico) under drought stress and
non-stress conditions. Yields were reduced by drought stress
and Macrophomina phaseolina, the causal fungal pathogen of
charcoal rot. Drought stress, disease pressure and low yields
contributed to the high variation coefficients (VC), which
hindered the identification and selection for superior lines.
Selection was based on rank of the geometric mean (GM)
yield, calculated from the yield of each line in the stress and
non-stress treatments. The RIL, L88-63 ranked first in GM
yield at both locations. Subsequent testing in Honduras and
Michigan supported the high yield potential and broad
adaptation of L88-63. Breeding for drought resistance in
lowland tropical environments will require that additional
resistance to M. phaseolina be incorporated into potential
new bean lines being considered for release in this region.
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