1Field Crops Research Institute, Vietnam Academy of Agricultural Sciences, Lien Hong, Gia Loc, Hai Duong, Vietnam
2Vietnam Academy of Agricultural Sciences, Vinh Quynh, Thanh Tri, Hanoi, Vietnam
3Agricultural Genetics Institute, Vietnam Academy of Agricultural Sciences, Co Nhue, Bac Tu Liem, Hanoi, Vietnam
*Corresponding Author: Luu Minh Cuc, Agricultural Genetics Institute, Vietnam Academy of Agricultural Sciences, Co Nhue, Bac Tu Liem, Hanoi, Vietnam, Email: cucchi04@gmail.com
Online published on 9 March, 2026.
Drought stress is a major abiotic constraint affecting common bean (Phaseolus vulgaris L.) production in Vietnam, highlighting the need to identify drought-tolerant genotypes for sustainable cultivation.
This study assessed drought tolerance in 11 imported genotypes using morphological indices and SSR markers. Plants were grown under control (100% field capacity) and drought stress (30% field capacity) conditions, with tolerance evaluated based on the drought susceptibility index (DSI), drought tolerance efficiency (DTE) and grain weight (GW). Molecular analysis using 20 SSR markers.
DR1, DR2 and DR6 demonstrated the highest drought tolerance (DSI<1, DTE>54%), whereas DR9, DR11 and DR12 (CVR VN2) were drought-sensitive. Molecular analysis using 20 SSR markers identified 81 alleles (4.05 alleles per locus), indicating moderate genetic diversity (PIC= 0.50, Jaccard's index= 0.56). Cluster analysis (UPGMA) grouped the genotypes into two main clusters, with drought-tolerant genotypes forming a distinct sub-cluster. These results reveal a strong correlation between morphological drought tolerance and genetic diversity, emphasizing the potential of DR1, DR2 and DR6 for cultivation in droughtprone regions. Further marker-assisted selection (MAS) and hybridization strategies are recommended to develop high-yielding, drought-tolerant common bean varieties, ensuring climate-resilient production in Vietnam.
Drought indices, Genetic diversity, Phaseolus vulgaris L, SSR
