Combining Ability Analysis for Nine Promising White Maize Inbred Lines in a Half-Diallel Cross

2012 ◽  
Vol 16 (2) ◽  
pp. 161-172
Author(s):  
Sh. A. M. Shaboon ◽  
M. S. E. Sadek ◽  
H. A. A. Gamea
Keyword(s):  
Combining Ability ◽  
Diallel Cross ◽  
Inbred Lines ◽  
Maize Inbred Lines ◽  
Combining Ability Analysis ◽  
Half Diallel

GENOTYPE × ENVIRONMENT INTERACTIONS IN SMOOTH BROMEGRASS. I. YIELD

1979 ◽  
Vol 21 (1) ◽  
pp. 57-63 ◽  
Author(s):  
Wai-Koon Tan ◽  
Geok-Yong Tan ◽  
P. D. Walton
Keyword(s):  
Genetic Variation ◽  
Analysis Of Variance ◽  
Combining Ability ◽  
Significant Variation ◽  
Diallel Cross ◽  
General Combining Ability ◽  
Bromus Inermis ◽  
Smooth Bromegrass ◽  
Combining Ability Analysis ◽  
Half Diallel

Twenty-one progenies and the parents of a 7 × 7 half diallel cross of smooth bromegrass (Bromus inermis Leyss.) were evaluated at four locations in Alberta in each of two years, for genetic variation and genetic by environment interactions in the expression of their yield potentials. Years, locations and their interactions were highly significant in the combined analysis of variance. Combining ability analysis revealed that general combining ability (GCA) and specific combining ability (SCA) were both important in the expression of yield, including spring, fall and annual yield, whereas GCA was more important than SCA for yield per area. Although the genotype × environment interactions were all highly significant, variation accounted for by combining ability effects was generally higher than the interaction effects of GCA and SCA respectively, with environments. High average GCA effects for spring, fall and annual yield were demonstrated for the clones UA5, UA9 and B42. These together with the high average SCA effects suggested that the three clones could be included in a synthetic to develop high yielding cultivars. The results suggested that recurrent selections involving multi-location and multi-year testing seems necessary in breeding for high yielding bromegrass cultivars in Alberta.

scholarly journals Combining Ability Analysis of Maize Inbred Lines in Ethiopia

2020 ◽  
Vol 7 (2) ◽  
pp. 113-124
Author(s):  
Abenezer Abebe Tefera ◽  
Legesse Wolde Beyene ◽  
Wosene Gebreselassie Abtew
Keyword(s):  
Analysis Of Variance ◽  
Combining Ability ◽  
Genetic Material ◽  
Inbred Lines ◽  
Gene Effects ◽  
Lattice Design ◽  
Maize Inbred Lines ◽  
Combining Ability Analysis ◽  
Additive Gene ◽  
Proportional Contribution

The study was initiated to estimate combining ability of maize inbred lines and crosses using line by tester analysis. Fifty entries consists 48 F1 single crosses developed from 24 inbred lines and 2 testers using line x tester design and two commercial check hybrids used in the study. The experiment was conducted using alpha lattice design with two replications. Analysis of variance revealed existence of significant genetic variation among genotypes for all studied traits except for plant aspect (PA). Location x entry interaction for most of the traits was not significant which suggests hybrid performance was consistent across tested locations. Line x tester analysis of variance showed that mean squares due to GCA of lines were significant (p< 0.01 or p< 0.05) for all studied traits. Mean squares of tester GCA and SCA were significant for most of studied traits. This indicates that both additive and non-additive gene effects had contributed for the variation of the crosses. However, higher proportional contribution of additive gene action for all studied traits was obtained. Several lines and crosses were identified as good general and specific combiners for yield and yield related traits. Lines L23, L11, L15 and crosses L2xT1, L3xT1, L8xT1, L11xT1, L23xT1 and L13xT2 were found to be good general and specific combiners, respectively. In conclusion, the stated inbred lines with desirable gca effects and cross combinations with desirable sca effects for grain yield and yield related traits could be used as useful genetic material.

scholarly journals COMBINING ABILITY ANALYSIS FOR DIFFERENT YIELD COMPONENTS IN MAIZE (Zea mays L.) INBRED LINES

2015 ◽  
Vol 27 (1) ◽  
pp. 17-23
Author(s):  
F. M. A. Haydar ◽  
N. K. Paul
Keyword(s):  
Combining Ability ◽  
Yield Components ◽  
Block Design ◽  
Inbred Lines ◽  
Diallel Mating Design ◽  
Combining Ability Analysis ◽  
Randomized Complete Block Design ◽  
Additive Gene ◽  
New Varieties ◽  
Half Diallel

The  present  study  was  carried  out  to  determine  the  combining  ability  of  yield and yield components by crossing six diverse maize  inbred lines in a half diallel mating design. Fifteen F1 progenies along with their six parents were planted in randomized complete block design with three replications. GCA to SCA ratios were less than one for plant height, cob diameter, cob length and number of kernels row/cob indicating a preponderance of additive over non additive gene action. The crosses P1×P2, P3×P5 and P5×P6 were exhibited significant and positive SCA effects for yield and cob diameter, number of row/cob and number of grains/cob of yield contributing characters. The parents P1 (IL4), P3 (IL18)and P5 (IL23 were good general combiner for grain yield and yield attributing characters. It can be concluded that these parental lines can be desirable parents for hybrids as well as for inclusion in breeding program, since they may contribute favorable alleles in the synthesis of new varieties.

Combining Abilities for Seven Elite Yellow Maize Inbred Lines in a Half - Diallel Cross

2013 ◽  
Vol 17 (6) ◽  
pp. 53-62
Author(s):  
S. A. M. Shaboon ◽  
A. A. Abd El-Mottalb ◽  
W. M. El-Sayed ◽  
M. A. A. Mostafa
Keyword(s):  
Diallel Cross ◽  
Inbred Lines ◽  
Combining Abilities ◽  
Maize Inbred Lines ◽  
Half Diallel
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