Heterosis and combining ability analysis for few cold tolerant rice germplasm lines at their seedling stage

Rice yields are low during rabi season when compared to kharif due to cold effect at seedling stage. In the present study, 4 lines and 4 testers were crossed with 4 testers in L X T mating design. The resultant 16 F1s were used to determine the heterosis. IR-64, Ujala Depama and MALIDA are identified as good general combiners. IR64 X Ujala Depama, IR64 X Malida and MTU-1010 X Ujala Depama are good specific combinations . IR64 X Ujala Depama, IR64 X Malida and Krishna Hamsa X Parwa Panki are the best heterotic lines for the character under study.