Publication: Mapping of Quantitative Trait Loci (QTL) Related to Drought Tolerance in Common Bean (Phaseolus vulgaris L.) Using F2 Population from (KATB1 Χ GLP2)
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2018-10-13
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NACOSTI
Publisher
International Annals of Science
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Abstract
Many of the common bean growing regions around the world are prone to drought stress, making
drought the major challenge to production and yield stability in rainfed environments. Mapping of
yield-associated loci under drought stress will offer a better understanding of the genetics of drought
tolerance to the plant breeders and therefore, will accelerate the selection of drought tolerant crop
varieties through marker assisted selection (MAS).The current study reports identification of
quantitative trait loci (QTL) linked to physiological, phenological, yield and yield related traits using
120 F2 population derived from a cross between two common bean genotypes, KAT B1 (drought
tolerant) and GLP2 (drought susceptible) evaluated under drought stress and well-watered conditions.
The research was conducted at the Agricultural and Mechanization Institute, Machakos, Kenya. The
F2 population showed significant variation in traits under drought stress. From the 374 polymorphic
SNP markers surveyed, 20 genomic regions were identified for various traits under drought stress,
individually explaining 2.6 to 21.3% of phenotypic variation. The number of QTLs identified per trait
were: 2-grain/seed yield (GY); 1-number of branches (NBP); 2-stem biomass (SB); 1-leaf biomass (LB);
1-pod biomass (PB); 3-days to flowering; 2-days to maturity (DM); 4- number of pods per plant (NPP);
1-seed weight (SW); 2-stomatal conductance (SMTL) and 1-leaf water potential (LWP). QTLs for
number of pods per plant, number of grains/seeds per pod, days to flowering, leaf biomass and stem
biomass were found co-locating with QTLs for grain yield on chromosome Pv02 under drought stress
treatment. The cumulative effects of these QTLs on chromosomes 2 resulted in higher grain/seed
yield. This study has provided information on QTLs in common bean that could be used in selection
purpose for grain yield under drought conditions.
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Keywords
common bean, drought, genotypes, markers, QTLs, tolerance, traits.