Estimation of some genetic parameters using line×tester analysis of common wheat (Triticum aestivum L.)

Abstract

Seven common wheat (Triticum aestivum L.) cultivars were crossed in a line×tester matting design. The 12 F1 and their parents were evaluated using a Completely Randomized Block Design (CRBD) replicated three times in Kurdistan Reign-Iraq at two different locations, first Kanipanka in Sharazoor Valley, and the second was Qlyasan Agricultural Research Station, University of Sulaimani, during the winter season of 2017-2018. The Least Significant Differences Test (LSD) at (P≤0.05) was carried out to compare the means of the characters. The results confirmed that sufficient genetic variability was included with all traits studied. The cross Aras×Iba-95 at Kanipanka location and Klal×Cham-6 at Qlyasan location had better grain yield/plant mean than their parents. The cross Aras×Iba-95 and Klal×Cham-6 at both locations exhibited maximum positive heterosis for grain yield/plant and most of their components. Line parents Aras and Klal are good general combiners for grain yield/plant and most its components at both locations respectively. The cross Aras×Iba-95 is the better specific combiner to increase grain yield/plant at both sites. The superiority of non-additive type of gene actions in controlling the inheritance of these characters was confirmed.