تعیین ضرایب همبستگی و تجزیه علیت صفات موثر بر عملکرد در لاین‌های موتانت طارم محلی

  TThis study was undertaken with the objective to determine the association between grain yield and its components and identifying traits have the greatest effects on grain yield of 45 mutant lines from tarom-mahaliin a randomized complete block design with three replications. Analysis of variance showed significant differences among genotypes for all traits. Mean comparison showed that line 2 (M6 – L 435) was supperior than other genotypes as regards to its yield, filled grains per panicle, panicle number and panicle length. Correlation coefficients between traits indicate that traits the number of filled grains perpanicle (0.855), panicle length (0.929) and panicle number (0.904) were positive and significantly associated with grain yield. Results of stepwise regression showed that the traits including panicle length, number of filled grains perpanicle, panicle number and plant height explained 92.5 percent of grain yield variation, respectively. Results of path analysis showed that maximum direct effects belonged to the panicle length (0.514), number of filled grains perpanicle (0.299) and panicle number (0.153).Panicle number had the greatest indirect effect (0.470) on grain yield through panicle length. On the basis of results of this study, panicle length, number of filled grains perpanicle, panicle number and plant height identified as selection criteria for grain yield improvement in rice.