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United States Department of Agriculture

Agricultural Research Service

Research Project: CHARACTERIZATION, CONVERSION, AND IMPROVEMENT OF COMMON BEAN GERMPLASM

Location: Tropical Crops and Germplasm Research

Title: A mapping population for the evaluation of drought tolerance in dry beans

Authors
item Linares, A -
item Osorno, J -
item Porch, Timothy
item Urrea, Carlos -

Submitted to: Bean Improvement Cooperative Annual Report
Publication Type: Research Notes
Publication Acceptance Date: March 1, 2012
Publication Date: March 15, 2012
Citation: Linares, A.M., Osorno, J.M., Porch Clay, T.G., Urrea, C. 2012. A mapping population for severe drought tolerance in dry beans. Bean Improvement Cooperative Meeting Abstracts. 55:107-108.

Interpretive Summary: Genetic improvement of dry bean for drought tolerance has been slow, due to the unreliable techniques available for measuring response to drought, phenological plasticity, and the inability to create repeatable screening environments. An alternative breeding approach for drought tolerance is through the use of molecular markers. A common bean population was developed between SER 22, a drought tolerant small red line, and ‘Buster’, a drought susceptible pinto variety, to identify genetic regions associated with drought tolerance. Evaluation of the population under severe drought stress and non-stress was performed in Nebraska in 2011. Data on soil water content, evapotranspiration, crop water use efficiency, leaf temperature, plant phenology, plant architecture, yield, 100-seed weight, biomass and pod harvest index was collected. This work promises to identify genetic regions that can be used for future selection of drought tolerant common bean varieties.

Technical Abstract: Genetic improvement of dry bean for drought tolerance has been slow, due to the unreliable techniques available for measuring response to drought, phenological plasticity, and the inability to create repeatable screening environments. An alternative breeding approach for drought tolerance is indirect selection with the use of molecular markers. A recombinant inbred line population was developed from a cross between SER 22, a CIAT’s drought tolerant small red line, and ‘Buster’, a drought susceptible pinto, to identify drought tolerance QTLs. This population is currently at the F5:7 with 337 RILs selected for high levels of genotypic diversity to facilitate mapping and high phenotypic polymorphism in the field. Evaluation of the RILs population under severe drought stress and non-stress has been performed in Nebraska in 2011. Data on soil water content, evapotranspiration, crop water use efficiency, leaf temperature, plant phenology, plant architecture, yield, 100-seed weight, biomass and pod harvest index will be presented. Additional testing will be conducted next spring.

Last Modified: 7/22/2014
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