Character Association and Stress Indices Analysis for Yield Components in Sub 1 QTL Introgressed Backcross Lines of Rice (Oryza Sativa L.)

Muthuvijayaragavan R, E. Murugan

Abstract


The present study was carried out by utilizing two cosmopolitan rice varieties ADT 43 and Improved White Ponni (IWP) along with donor for submergence tolerance FR13A. The backcross generations of two cross combinations (cross 1 (ADT 43 x FR 13A) and cross 2 (IWP x FR 13A)) were raised in nursery beds and transplanted to main field at the water level of 40 cm at Agricultural College and Research Institute, Madurai in Randomized Block Design under submerged condition. Character association of the yield attributing traits revealed that the traits number of tillers per plant, number of productive tillers per plant, number of filled grains per panicle, total number of grains per panicle and spikelet fertility have to be given priority during selection to increase grain yield under submergence stress as they were significantly and positively correlated with single plant yield and inter correlated among themselves. Path Coefficient analysis revealed that the traits number of productive tillers per plant and number of filled grains per panicle are the major yield contributing traits to be given importance during selection under submergence condition as they had high direct effect on grain yield and also exhibit high indirect effect on single plant yield through total number of grains per panicle

Keywords


Rice, QTLs, Submergence, Association, Segregating population, Yield

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