In mung bean (Vigna radiata L. Wilczek), flooding is a major abiotic constraint limiting productivity in flood-prone areas. The presented study aimed to evaluate the morpho-agronomic traits of 15 mung bean genotypes under waterlogging for zero, seven, and 10 days in a randomized complete design with factorial arrangement and three replications. Analysis of variance revealed significant effects of genotypes, flooding durations, and their interactions on the pod number, seed weight, trifoliate leaves, and root traits. After seven days of flooding, genotypes Murai and Lokal Majenang produced the highest pod number (10.33 and 7.00 pods, respectively), while genotypes Kasu and Kutilang produced the fewest pods (5.33 and 8.00 pods, respectively) after 10 days of flooding. Root traits were highly sensitive, particularly with genotypes Kasu and Kutilang expressing better root length (14.1 and 18.0 cm, respectively) and root weight (1.9 and 2.6 g, respectively) under flooding stress conditions. Broad-sense heritability was moderate for root length (31.7%) and wet root weight (22.0%), whereas seed and stover traits showed low heritability. Pod number and root length emerged as key indicators of flooding tolerance. Genotypes Kasu, Lokal Majenang, and Kutilang were the recommended promising donors for breeding waterlogging-tolerant mung beans.

Keywords: Mung bean (V. radiata L.), flooding stress, heritability, landraces, yield traits

Key findings: Flooding stress conditions significantly affected and reduced the growth and yield traits in mung bean (V. radiata L.), and the accessions showed different responses, revealing considerable genetic variability. Pod number and root length surfaced to be the most sensitive and reliable traits for screening tolerance in mung beans.