Combining Ability of Selected Rice Hybrids and Parents to Gall Midge Resistance

摘要

Five CMS lines were crossed with 13 R lines and the resultant 65 hybrids along with the parents and six checks viz., KRH-2, DRRH-2, PA-6201 Jaya, IR-64 and T (N) 1 were evaluated for gall midge resistance, combining ability of the hybrids at three locations viz.. Kunaram (Karimnagar District), Warangal and Kampasagar (Nalgonda district) of Telangana region. The reaction of genotypes towards the gallmidge at three locations is different, the incidence recorded was more at Warangal. followed by Kampasagar and Kunaram. This may be due to the different biotypes existing at three locations. The R lines used are taken from RARS Jagtial, which may be resistant to gallmidge biotype 3, due to existence of different biotypes of gallmidge at Warangal as well as at Kampasagar, the incidence percentage varied, accordingly. However, some hybrids exhibited resistancereaction at all the three locations indicating the resistance of hybrids to different biotypes. Among the gallmidge resistant hybrids based on per se performance, the top five hybrids identified are, APMS 6 A x JGL 11111, APMS 6 Ax JGL8292, IR 58025Ax JGL 16284, IR 68897 A x JGL 16284 and APMS 6 A x JGL 13515.