Heterosis estimates for yield and yield components in rice (Oryza sativa L.) using line × tester analysis

Abstract

Present investigation was undertaken to study heterosis through line × tester design of experimental hybrids for yield and its component at Norman E. Borlaug Crop Research Centre. Pantnagar, Uttarakhand, India. Ten lines were crossed with three testers and the resulting 30 hybrids along with their parents were evaluated for heterosis (heterobeltiosis, relative heterosis and standard heterosis) in a replicated trial using randomized block design for various yield contributing charachters namely days to 50% flowering, days to maturity, grain length, grain width, 1000 grain weight and grain yield per plant. Standard heterosis was estimated by using Pant dhan 24 as a check parent. Cross combinations namely PR113×HKR47 (-4.273) and UPR-3905-22-2-2-1×HKR 47 (-5.512) showed significant negative standard heterosis for days to 50% flowering and days to maturity respectively. highle significant and maximum standard heterosis was showed by cross combinations UPR3037-2-2-1-3×PD 24 (5.138), UPR3037-2-2-1-3×PD 24 (13.515), UPR3037-2-2-1-3×HKR47 (7.811) and UPRI 2015-2×PD 24 (18.728) for grain length, grain width, 1000 grain weight and grain yield per plant respectively.