Evaluation of Combining Ability Waxy Corn S3 Generation

Abstract

Evaluation of combining ability of waxy corn inbred lines is an important procedure in hybrid development. The objective of this study was aimed to evaluate combining ability of waxy corn inbred lines of several agronomic characters in good hybrid adaptability in Phayao. Sever S₃ generation (UPW 1,2,3,4,5,6 and 7) were crossed using model Griffing’s method IV and 21 hybrids were performed in a randomized complete block design with four replications at the Experimental Farm of the Faculty of Agriculture and Natural Resources, University of Phayao in dry season 2012. Combining ability evaluation, UPW5 was expressed with the best combination of best combination of GCA effects for green weight and also white. In the others agronomic characters namely standard ear weight, shelling percentage, cutting percentage, amylopectin percentage, total sugar, non-reducing sugar, plant aspect and ear aspect were shown the superior in UPW7, UPW7, UPW5, UPW6, UPW1, UPW1, UPW7, and UPW6, respectively. Furthermore, the SCA results showed that the best breen weight was crossed of UPW2 x UPW4 that gave 2,127 kg/rai and white weight was UPW5 x UPW6 (1,523 kg/rai). Most important, the eating quality containing with flavor, tenderness and pericarp thickness was found in UPW1 x UPW5, UPW4 x UPW7 and UPW1 x UPW5 (4.1, 4.3 and 1.5), respectively.