HETEROSIS STUDY IN RICE (Oryza sativa L.) UNDER TEMPERATE CONDITIONS

S.H. DAR¹*, A.G. RATHER², S. NAJEEB³, M.A. AHANGER⁴, G.S. SANGHERA⁵, S. TALIB^6
1Division of Genetics and Plant Breeding S. K. University of Agricultural Sciences and Technology Kashmir, Shalimar - 190 025, J&K, India.
²Division of Genetics and Plant Breeding S. K. University of Agricultural Sciences and Technology Kashmir, Shalimar - 190 025, J&K, India.
³Mountain Research Centre for Field Crops, S. K. University of Agricultural Sciences and Technology Kashmir, Anantnag - 192102, J&K, India.
⁴Mountain Research Centre for Field Crops, S. K. University of Agricultural Sciences and Technology Kashmir, Anantnag - 192102, J&K, India.
⁵Division of Genetics and Plant Breeding S. K. University of Agricultural Sciences and Technology Kashmir, Shalimar - 190 025, J&K, India.
⁶Mountain Research Centre for Field Crops, S. K. University of Agricultural Sciences and Technology Kashmir, Anantnag - 192102, J&K, India.
* Corresponding Author : dar.sajad@rediffmail.com

Received : 20-06-2015     Accepted : 27-08-2015     Published : 01-10-2015
Volume : 7     Issue : 6       Pages : 540 - 545
Int J Agr Sci 7.6 (2015):540-545

Keywords : CMS lines, hybrid rice, Line x Tester, standard heterosis, temperate agroecology
Academic Editor : Gupta Ramwant, Sivaji Mathivanan
Conflict of Interest : None declared

Twenty seven hybrids in rice were generated during Kharif-2011 by crossing 9 lines and three cytosterile lines in a line x tester fashion and analyzed over two diverse environments during Kharif 2012. Out of 27 test crosses evaluated, 10 restorers, 8 partial restorers, 3 maintainers and 6 partial maintainer were categorized on the basis of degree of pollen fertility and spikelet fertility. Three genotypes K-08-61, K-08-60 and PS-5 were found as most effective restorers. Heterosis over better parent and standard check was computed on fourteen metric traits only for fully restored cross combinations. There was a wide range of heterotic patterns for all the traits studied. Six out of 10 fully restored cross combinations indicated significant heterobeltiosis and standard heterosis for grain yield plant-1. The three promising combinations for grain yield and other economic traits were SKAU 7A x PS-5, SKAU 11A x K-08-60 and IR-68888 x K-08-61.Similarly significant and desirable heterotic combinations were reported for yield components and other traits.