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ASSOCIATION ANALYSIS OF SOME YIELD INFLUENCING TRAITS IN AROMATIC AND NON AROMATIC RICE

ZIA-UL-QAMAR, AKBAR ALI CHEEMA, MUHAMMAD ASHRAF, MUHAMMAD RASHID AND GHULAM RASUL TAHIR

Abstract: Studies on path coefficient analysis for yield and yield components in rice, involving nine genotypes of aromatic group and eight genotypes of non-aromatic group were conducted separately. The study was conducted at the Nuclear Institute for Agriculture and Biology, Faisalabad during 2001-02. Thirty days old seedlings were transplanted by maintaining 20 cm plant-to-plant and row-to-row spacing. Analysis of variance reflected significant differences among the genotypes for all the traits studied in both the groups. Broad sense heritability estimates for various traits ranged from 56-89% in the non-aromatic group and 46-99% in the aromatic group. In both the groups, the phenotypic coefficients of variability were higher than their respective genotypic coefficients of variability for all the traits, indicating the effect of the environment on character association. In the non-aromatic group, productive tillers per hill showed highly significant positive association with grain yield per plant. Whereas in the aromatic group days-to-50% flowering and days-to-maturity exhibited highly significant negative genetic association with grain yield per plant. Association and path analysis suggested that productive tillers per hill, days to maturity and days to 50% flowering may be considered important for the improvement of grain yield in the non-aromatic group whereas productive tillers per hill, spikelets per panicle, fertility %age and plant height may be considered as the selection criteria for the direct improvement of grain yield in the aromatic group.
 

Mutation Breeding Division, Nuclear Institute for Agriculture and Biology (NIAB) P.O. Box 128, Jhang Road, Faisalabad, Pakistan.