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The present investigation entitled “Combining ability studies in the selected parents and hybrids (Oryza
sativa .L)” was undertaken to study the combining ability through L x T design of experimental hybrids
for single plant yield and its components in Telangana .Five CMS lines were crossed with 13 R lines and
the resultant 65 hybrids along with the parents and five checks viz.,KRH-2, DRRH-2, PA-6201 Jaya, and
IR- 64 were evaluated for combining ability (Line x Tester design) at three locations viz., Kunaram
(Karimnagar District),Warangal and Kampasagar (Nalgonda District) of Telangana .Among the lines
APMS 6 A and among the testers JGL 8292, JGL 8605, JGL 17211, JGL 13515 and JGL 3844 are proved
to be good combiners for majority of the characters including the yield, by exhibiting the high gca effects.
Out of 65 hybrids, the top five hybrids based on sca effects are APMS 8 A x JGL 11110-2 (7.01), APMS 8
A x JGL 11110-1 (5.48), APMS 6 A x JGL 1111-2 (4.77), APMS 8 A x JGL 13515 (4.01) and APMS 8 A x
JGL 8605 (3.93), while the mean performance ranged from 27.64 g/plant to 31.22 g/plant. Among the 65
hybrids tested at three locations 21 hybrids, recorded significant positive gca effects for single plant
yield.
Key words: Oryza sativa, heterosis, dominance and epistasis.