Vol. 11, Issue 3 (2022)

Author(s):
K Rukmini Devi, Y Hari, K Rajendra Prasad and P Jagan Mohan Rao

Abstract:
Heterosis for yield, yield components and quality traits of 54 hybrids developed by using three CMS lines and eighteen allocytoplasmic restorers developed by recombination breeding were crossed in LxT design and evaluated in RBD. The magnitude and direction of heterosis over better parent and standard check differed from character to character depending upon cross combinations. High amount of heterosis was observed for grain yield/plant, filled seeds / panicle, test weight, days to 50% flowering, panicle length, flag leaf length, head rice recovery, length/breadth ratio, kernel breadth after cooking and volume expansion ratio. The manifestation of heterosis for grain yield/plant is evident by significant superiority of hybrid over better parent ranged from -57.45** to 71.28** and over standard check ranging from -27.53** to 149.44**. For grain yield/plant the hybrids, 68897A x RR23(149.44**), 68897A × WGL 676(95.51**), 79156A × WGL 676(95.51**) 68897A ×WGL 1063(90.45**) 79128A × R17(83.15**) recorded significant relative heterosis, heterobeltiosis and standard heterosis, while 79156A × RR15 and 68897A x RR15 recorded for head rice recovery. The hybrids viz., 79156A x RR3, 79156A x RR15, 79156A x WGL347, 79128A x RR15, 68897A x RR3, 68897A x RR17, 68897A x RR50, 68897A x RR55 and 68897A x MTU11-320-11 performed well for grain yield/plant combined with several other important yield components and quality traits viz, head rice recovery, kernel length, length/breadth ratio and kernel elongation ratio in desired direction. Thus these hybrids need to be further tested in observational/multilocation trials before the commercial exploitation of their heterotic potential.