Sahu, Gouri ShankarPramanik, Kartik2024-09-272024-09-272023-08-11https://krishikosh.egranth.ac.in/handle/1/5810215088The present investigation entitled “Genetic studies for morpho-physiological and yield attributing traits in French bean (Phaseolus vulgaris L.)” was conducted at Central Horticulture Experiment Station, ICAR-Indian Institute of Horticulture Research, from the period rabi 2019 to 2022. The objective was to study the DUS characterization, nature and extent of genetic variability, genetic divergence, heterosis, stability analysis and identification of transgressive segregants for yield and yield attributes. Twenty seven genotypes for divergence study and stability analysis were evaluated by RBD with three replications, three parents for reciprocal crosses, 145 F2 for identification transgressive segregants were used. The genotypes were evaluated for 13 parameters including, seed traits, plant growth, flowering, pod yield and yield attributing as well as pod quality traits. All recommended management practices were followed to raise a good crop. The analysis of variance revealed that significant variations among the bush type and pole type French bean genotypes for qualitative and quantitative traits which showed existence of sufficient variability among them. The genotype IC 632961 witnessed maximum plant height (313.35 cm), leaf area (157.38 cm2), number of seeds pod-1(9.95), average pod weight (18.45 g), protein content (1.28g100-1), pod yield plant-1 (323.13 g) under pole type category and variety Arka Arjun recorded plant height (42.58 cm), minimum days to 50% flowering (36.28), days to 1st harvest (50.25), number of inflorescence plant-1 (16.13), pod length (17.75 cm), number of seeds pod-1 (7.75), average pod weight (14.8 g), pod yield plant-1 (261.48 g) under bush type category. Leaf area, number of inflorescence plant-1, number of seeds pod-1, number of pods plant-1, pod length, average pod weight and pod yield plant-1 had high GCV, heritability and genetic advance as percentage of mean exhibiting effect of additive genes. Pod yield plant-1 had positive association with plant height, leaf area, number of inflorescence plant-1, pod length, number of seeds pod-1, number of pods plant-1, average pod weight. Number of pods plant-1 and average pod weight had the maximum positive direct effect on pod yield plant-1. Nineteen poletype and eight bush type French bean genotypes grouped into four and three divergent clusters which had high inter-cluster D2 values, ranged from 0 to 270.67 and 0 to 242.21 respectively.For pole bean, cluster I contains one, II (2), III (8), IV (8) and for bush bean cluster I contains (one), II (3), III (4) genotypes. Crosses involving genotypes form bush bean (Arka Arjun) and pole bean (IC 632961) can be used in hybridization programme for achieving higher heterosis due to high genetic divergence. Analysis of stability revealed that the genotypes; IC 632961 was found most stable for yield and associated traits. Arka Sukomal and Arka Arjun had higher yield and positive interaction indicating that these genotypes could be good for specific adaptation. October and December sowing form two mega environment with significant interaction which can be considered for stability analysis and recommending appropriate variety (s) and sowing time of French bean. Based on per se performance, heterotic response (better parent and standard check), the three crosses viz., IC 632961 X Arka Sukomal (37.71%, 32.59%), Arka Arjun X IC 632961 (55.27%, 56.62%), IC 632961 X Arka Arjun (78.09%, 79.61%) for pod yield plant-1 appeared to be most suitable for exploitation in practical plant breeding programme. Such combinations are expected to throw better segregants for pod yield and yield components in the subsequent generations which can be exploited effectively for improvement of French bean. Maximum transgressive segregants were identified for leaf area, number of pods plant-1, pod length and pod yield plant-1 in F2 derived from the three crosses IC 632961 X Arka Sukomal, Arka Arjun X IC 632961, IC 632961 X Arka Arjun due to additive and complementary gene action.EnglishThesis