Indigenously developed SI and CMS lines in hybrid breeding of cabbage

Six SI lines with strong incompatibility reaction and one CMS line with good floral traits and seed setting capacity were tested in Line × Tester design with six broad base testers. Mean sum of squares of all the 42 hybrids were significant for all the seven traits studied. Significant high GCA for earliness was recorded in the SI line, S-696 (−2.20). Significant high GCA for productivity was recorded in 3 SI lines, S-624, S-645 and S-208. Highest SCA effect for head size was recorded in S-208 × 83-6 followed by S-621 × GA-121. Highest heterosis for head weight was recorded in the hybrid, S-621 × GA-121 (37.9%) followed by S-624 × GA-111 (34.1%) and S-208 × GA 111 (31.8%). The line CMS-1 was also useful in developing hybrids with desirable plant type indicating suitability of these SI and CMS lines in developing high yielding F₁ hybrids with desirable plant architecture.