1Ph. D. scholar (Plant Breeding and Genetics) Rajmata Vijayaraje Scindia krishi Vishwa Vibyalatya, College of Agriculture, Gwalior (M.P.) Pin% 474002
2Principal Scientist (Plant Breeding and Genetics) Rajmata Vijayaraje Scindia krishi Vishwa Vibyalatya, College of Agriculture, Gwalior (M.P.) Pin% 474002
Online published on 13 December, 2017.
The six generations mean (P1, P2, F1, F2, BC1 and BC2) of 3 crosses of bread wheat viz., ‘HPW 296 X LOK 1’; ‘HPW 296 × SONALIKA’ and ‘HPW 296 × HW 5205’ were sown in a randomized complete block design with two replication during Rabi season of 2013–14. Significant A, B and C scales showed presence of non-allelic interaction. Further six parameters analysis was carried out for estmation of gene effects viz., m, d, h, i, j, & l. Six parameter model suggested that both additive as well as dominance gene effects were significant in positive direction for harvest index, biological yield and grain yield in crosses ‘HPW 296 × SONALIKA’ and ‘HPW 296 × HW 5205’ and productive tillers per plant, spike length and days to 50% flowering in ‘HPW 296 × LOK 1’. Additive gene effects were significant in positive direction for days to physiological maturity in all the 3 crosses, whereas, 1000 grain weight, harvest index, biological yield and grain yield in cross ‘HPW 296 × LOK 1’. The dominance gene effects were significant in positive direction for peduncle length in all 3 crosses. However, it was significant in positive direction for flag leaf area and 1000 grain weight in ‘HPW 296 × SONALIKA’ and ‘HPW 296 X HW 5205’; for tillers per plant and biological yield in cross ‘HPW 296 X SONALIKA’ and leaf canopy temperature in ‘HPW 296 × LOK 1’ and spike per plant in ‘HPW 296 × HW 5205’. However, the dominance gene effects were more important than additive gene effects in the inheritance of grain yield and most of the other studied traits. The signs of (h) and (l) were in opposite direction in most cases suggesting duplicate type of non-allelic interaction in these traits. The dominance effects showed higher values than the additive effects, indicating that dominance gene effects play the major role in controlling the genetic variation of grain yield and its attributes. Cross ‘HPW296 × LOK 1’ and ‘HPW296 XSONALIKA’ showed significant heterosis over MP and BP for grain yield, productive tillers per plant, spike length and days to 50% flowering. In the present studies presence of both fixable and nonfixable type of gene action ‘HPW296 × LOK 1’ and ‘HPW296 × SONALIKA’ indicated recurrent selection in segregating generation may lead to improvement in grain yield and its attributes of Wheat through fixation of both additive and non-additive components.
