Genetic analysis of yield and yield contributing traits in bread wheat

摘要

Ten wheat genotypes were crossed in diallel manner excluding reciprocals. The crosses along with parents were analysed for combining ability and significant variation was found amongst genotypes for various yield and yield contributing traits. ANOVA revealed that mean square for general combining ability was significant for all the traits studied except for spike length. Mean square for SCA was also non significant for spike length while for all other characters it was significant. Out of total 45 crosses 5, 8, 4, 7, 8, 3, 3, 11, 11, 13, 8 and 11 crosses showed significant SCA effects in desirable direction for days to 75% heading, days to maturity, flag leaf area, number of productive tillers per plant, plant height, spike length, number of spikelets/spike, number of grains/ spike, 1000 grain weight, biological yield/plant, grain yield/plant and harvest index, respectively. Two cross combinations viz., HD 2967 × NIAW 1594 and KFA/2*KACHU × WH 1187 were identified as good crosses due to them having higher per se performance and significant SCA effects for three yield and yield contributing traits so these crosses presents an opportunity for commercial exploitation either in form of hybrid varieties or as base material for selection of potentialhomozygous lines from transgressive segregants for improvement of yield levels of bread wheat.