Six basic generations viz., of five selected crosses viz., LGG-460 × WGG-37, TM-96-2 × WGG-37, TM-96-2 × PM-112, MGG-295 × PM-110 and MGG-351 × PM-115 were studied to assess the nature and mode of gene action for yield and its component traits through generation mean analysis. In general, magnitude of dominance effects (h) has greater value than additive effects (d) for majority of the traits in all the crosses. All the traits are under the influence of duplicate epistasis besides additive type of gene effects for which bi-parental mating or inter-se mating may be adopted followed by pedigree method of selection to modify the genetic architecture of greengram for attaining higher yields with desirable properties. of five cross combinations viz., MGG-295 × PM-110, MGG-351 × PM-115, LGG-460 × WGG-37, TM-96-2 × WGG-37 and TM-96-2 × PM-112 were grown at the Dry land farm, S.V Agricultural College, Tirupati in compact family block design with two replications during rabi, 2013-14. The parents and F 1 's was sown in two rows in each replication, while F 2 's, B 1 's and B 2 's were sown in ten rows with the row length of 3 m, spaced 30 cm apart and with a plant spacing of 10 cm in each row. Data were recorded on 10 randomly selected plants from each replication in parents and F 1 s, 50 competitive plants in each backcross (B 1 's and B 2 's) and 100 competitive plants in F 2 generation for 15 quantitative traits viz., days to 50 per cent flowering, days to maturity, plant height, number of branches/plant, clusters/plant, pods/cluster, pods/plant, seeds/pod, 100 seed weight, dry weight/plant, harvest index, seed protein, total sugars, tolerance to MYMV and seed yield/plant. Data were subjected to generation mean analysis of six parameter model as suggested by Hayman (1958). The significance of the scales and gene effects were tested by using the t-test (Singh and Chaudhary, 1985). Scaling tests A, B, C, and D of Mather (1949) were performed for all the characters to judge the adequacy of the additivedominance model.
