Evaluation of growth and yield traits in gamma-induced m7 generation mutants of field bean [Lablab purpureus var. lignosus (L.) prain]

An experiment was conducted at the vegetable block, College of Horticulture, Anantharajupeta, Andhra Pradesh, during 2024-25 to evaluate the elite mutant lines of the gamma-irradiated population of the field bean variety TFB-2 in the M₇ generation. Among all the mutant lines of M₇ generation, significant variability was observed among 15 mutant lines of field bean across key agronomic traits. Plant height ranged from 179.38 cm to 280.62 cm, with M_7.16 being the tallest. M_6.4 had the highest number of primary branches (3.60), while M_7.17 flowered earliest (51.67 days). M_7.19 excelled in inflorescence count (59.20), and M_7.28 had the longest inflorescence (45.56 cm). Pod traits peaked in M_7.18, which showed the highest pod count per inflorescence (9.07), the longest pod (58.90 mm), and the highest fresh seed yield (1005.72 g) and dry seed yield (310.38 g) per plant. These findings highlight M_7.18, M_7.3, and M_7.4 as promising lines for yield improvement.