Genetic analysis of yield and its components in different environments in wheat (Triticum aestivum L.)

Abstract

Generation means analysis of two crosses, Raj 1482 x HD 2329 and PBW 373 x Raj 3077 involving four varieties of wheat was carried out in respect of grain yield and its components characters. Six generations namely, P1, P2 , F1, F2, B1 and B2 of each of two crosses were separately grown in a randomized block design with three replications in 5 M long rows spaced 30 em apart with plant to plant distance of 10 em. The whole experiment was planted at three sowing dates, viz. 15th November 30th November and 15th December. Fifteen randomly selected plants each of P1, P2 thirty plants of F1, B1 and B2 60 plants of F2 generations, were utilized for recording observations on days to heading, plant height, flag leaf area, number of grains per spike, grain yield per spike and grain yield per plant in each environment separately. The data were first subjected to analysis of variance separately of each cross in each environment. The Pooled analysis of variance was done [1]. After that data were sUbjected to individual scaling tests [2] to detect the presence of epistasis. Further, the data were subjected to joint scaling test [3]. The gene effects of six parameter model and components of heterosis were calculated [4].