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Abstract
Drought is a major constraint of common bean (Phaseolus vulgaris L.) production in Uganda where irrigation for the crop is very uncommon. This study aimed to identify quantitative trait loci (QTLs) underlying drought tolerance in 128 F5 RILs derived from an Andean intra-gene cross between drought-tolerant SEQ 1027 and BRB 191. Eighteen traits were evaluated under drought stress and non-stress conditions in the field for 2 years and in the greenhouse for 1 year, respectively. A linkage map spanning 486.29 cM was constructed using 53 single nucleotide polymorphic markers (SNP) markers obtained from the KASP genotyping assay. Eleven consistent QTLs were detected on five linkage groups at a threshold of Logarithm of Odds (LOD) ≥ 3.0. Four QTLs were constitutive, seven were adaptive and were associated with 100 seed weight, grain yield, chlorophyll content, harvest index, dry weight of leaf and stem biomass and yield production efficiency. The QTL associated with a 100 seed weight (sw3.1BS) was the most consistent with the highest percentage of variation explained (21%). Co-localization of five drought-related factors QTLs was detected on pv10 suggesting pleiotropic effects on this chromosome. Identification of molecular markers closely linked to the QTLs identified in this study will facilitate marker assisted breeding for drought tolerance.
Highlights
Common bean is consumed by large numbers of the poor in Africa (Singh and Munoz, 1999)
The labor intensity involved in phenotyping for drought tolerance has made marker assisted breeding (MAB) a desirable tool in drought tolerance breeding programs
This study aimed at identifying quantitative trait loci (QTL) that can provide markers that could potentially be used in MAB
Summary
Common bean is consumed by large numbers of the poor in Africa (Singh and Munoz, 1999). The crop provides protein, complex carbohydrates, and valuable micronutrients for more than 300 million people in the tropics and is a staple crop for over 200 million people in sub-Saharan Africa (Akibode, 2011). Nabateregga et al 453 plays an important role in mitigating protein malnutrition and micronutrient deficiencies in regions where their effects are prevalent. The importance of common bean will increase in the future especially in tropical Africa where the demand is even likely to increase as the human population increases (Wortmann, 2006; Baudoin and Mergeai, 2001). In East Africa, beans are primarily grown by the smallholder farmers, especially women, for home consumption, while any excess production is sold at the market (Spence, 2006)
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