Estimate of Combining Ability in Maize (Zea mays L.) Using (Line x Tester) Method

H. A. AL-Joboory, Ahmed; H. M. Thiaib Al-gaisi, Watheq

	Estimate of Combining Ability in Maize (Zea mays L.) Using (Line x Tester) Method
Journal of Tikrit University For Agriculture Sciences
Article 1, Volume 17, Issue 3, 2017, Pages 80-95
Authors
Ahmed H. A. AL-Joboory; Watheq H. M. Thiaib Al-gaisi
Abstract
Nine inbred lines of maize were used in this study which were :OH ,ZP- 301,un440 ,Inbreed12 ,zp- 607 ,SH , Ik-58 ,IK-8 , and R-153 ,in tow seasons , the first was in Baigi province with three different dates (15/3 ,21/3 ,and 28/3) in springseason 2014 to aim doing all different crosses, while in the evaluation season was planted the genotypes C parents and the crosses resulted from these parents and the commercial cross in (Moring ) for spring season2015 in shiwan stationg of Kirkuk Agricultural administration by using RCBD with three replicates . the traits which studied were : (number of days to 50% male flowering and female flowering , plant height , main ear height , number of the leaves abure main ear , leaf area of the ear , number of ears , ear length , ear diameter , number of the rows in the ear , number of the grains in the row, number of the grains in the ear , weight of 100 grains and single plant yield ). General combining ability for the parents , specific combining ability for the first filial crosses and some genetic parameters were studied , the genotypes ( parents , first filial crosses and the commercial cross )showed significantly differences at 1% prob. level for all studied traits except ear diameter trait ,and mean sjuares of interaction between the lines and the testers was significant at 1% prob .levelfor an all the traits except number of the kernels in the ear which was significant at 5% prop .level , and did not reached significant level for number of the leaves abore main ear and ear diameter traits , the ratio of general combing ability variance to specific combing ability variance was less than one for the lines and for all the traits except leaf area and ear diameter traits , the liens (2) and (4) showed significant effect for desired direction in the traits : number of days to 50% of male and female flowering , number of kerenls in the row and in the ear and single plant yield and the tester (9) showed significant effect and desired in eight traits included the yield and its components .Specific combing ability effect was significant in desired direction for the cross ( 6x5 ) for all the traits except number of the leaves , leaf area of the ear , number of the ears , after it the cross(9x4) for the traits: plant height, main ear height , number of the ears , ear length , ear diameter , number of rows in the ear , number of the kernels in the ear and single plant yield . the dominance variance was more than that of additivevariance for all the studied traits, the values of heritability by narrow sence was low for the traits : number of the rows in the ear , number of the kernels in the row , number of the ear kernels , weight of 100 grains and single plant yield for the lines and ear height for the testers , and the traits : number of days to male and female flowering , plant height , ear diameter, number of the row kernels , number of ear kernels , weight of 100 grains and single plant yield as average , the average of dominance degree was more than one for all the traits except number of the leaves above main ear ( the line ) , leaf area , ear diameter (The tester) and ear diameter ( the range ) .
Keywords
Zea Mays; Combining ability; Line x Tester

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