Combining ability and gene action for maturity and agronomic traits in different heterotic groups of maize inbred lines and their diallel crosses

2012 ◽  
Vol 15 (3) ◽  
pp. 219-229 ◽  
Author(s):  
Afshar. Estakhr ◽  
Bahram. Heidari
Keyword(s):  
Combining Ability ◽  
Gene Action ◽  
Agronomic Traits ◽  
Inbred Lines ◽  
Heterotic Groups ◽  
Diallel Crosses ◽  
Maize Inbred Lines

scholarly journals Combining Ability and Gene Action Using 10 X 10 Diallel Crosses of Ten Maize Inbred Lines (Zea mays L.)

2021 ◽  
Vol 12 (11) ◽  
pp. 1205-1211
Author(s):  
M. E. M. Abd El-Azeem ◽  
RIZK ALY ◽  
W. M. El Sayed ◽  
Noura Hassan
Keyword(s):  
Zea Mays ◽  
Combining Ability ◽  
Zea Mays L ◽  
Gene Action ◽  
Inbred Lines ◽  
Diallel Crosses ◽  
Maize Inbred Lines

scholarly journals COMBINING ABILITY FOR YIELD AND OTHER AGRONOMIC TRAITS IN DIALLEL CROSSES OF SIX NEW YELLOW MAIZE INBRED LINES

2012 ◽  
Vol 3 (6) ◽  
pp. 1089-1099
Author(s):  
M. Sultan ◽  
S. Sadek ◽  
M. Abdel -Moneam ◽  
M. Shalof
Keyword(s):  
Combining Ability ◽  
Agronomic Traits ◽  
Inbred Lines ◽  
Diallel Crosses ◽  
Maize Inbred Lines

scholarly journals Combining Ability Study for Grain Yield and Agronomic Traits of Quality Protein Maize (Zea mays L.) Inbred Lines Adapted to Mid-Altitude Agroecology of Ethiopia

2021 ◽  
Vol 4 (3) ◽  
pp. 286-304
Author(s):  
Lemi Mideksa Yadesa ◽  
Sentayehu Alamerew ◽  
Berhanu Tadesse
Keyword(s):  
Grain Yield ◽  
Combining Ability ◽  
Agronomic Traits ◽  
Inbred Lines ◽  
Quality Protein Maize ◽  
Lattice Design ◽  
Maize Cultivars ◽  
Maize Inbred Lines ◽  
Maize Varieties ◽  
Almost All

In spite of the importance of quality protein maize to alleviate protein deficiency, almost all maize varieties cultivated in Ethiopia are normal maize varieties, which are devoid of lysine and tryptophan. Perusing the combining ability of QPM inbred for grain yield and its components is vital to design appropriate breeding strategies for the development of nutritionally enhanced maize cultivars. A line x tester analysis involving 36 crosses generated by crossing 9  elite maize inbred lines with 4 testers were evaluated for different desirable agronomic traits during the 2019 main season at BNMRC and JARC. The experiment was conducted using alpha lattice design with 3 replications. The objectives were to determine the combining ability of quality protein maize inbred lines, adapted to mid altitude agroecology of Ethiopia for agronomic traits. The crosses were evaluated in alpha lattice design replicated 3 times. Analyses of variances showed significant mean squares due to crosses for almost all the traits studied. GCA mean squares due to lines and testers were significant (P<0.05 or P<0.01) for most studied traits. SCA mean squares were also significant for most attributes across locations. The comparative importance of GCA and SCA variances observed in the current study for most studied traits indicated the preponderance of additive genetic variance in governing these attributes. Only L3 was the best general combiner for grain yield. Inbred line L3, for days to anthesis and L5 for days to silking had negative and significant GCA effects. L5 and L6 displayed negative and significant GCA effects for plant and ear height. Crosses, L2xT4, L3xT4, L4xT4, L5xT2, L6xT3, L7xT2, L9xT1 and L9xT4 were good specific combiners for grain yield. In general, these genotypes help as a source of promising alleles that could be used for forthcoming breeding work in the development of quality protein maize cultivars with desirable traits.

scholarly journals Association analysis of agronomic traits with microsatellites in maize inbred lines

Genetika ◽  
2018 ◽  
Vol 50 (2) ◽  
pp. 379-394
Author(s):  
Sanja Mikic ◽  
Ankica Kondic-Spika ◽  
Ljiljana Brbaklic ◽  
Dusan Stanisavljevic ◽  
Dragana Trkulja ◽  
...  
Keyword(s):  
Population Structure ◽  
Microsatellite Markers ◽  
Association Analysis ◽  
Agronomic Traits ◽  
Inbred Lines ◽  
Linkage Disequilibrium Mapping ◽  
Heterotic Groups ◽  
Local Conditions ◽  
Maize Inbred Lines ◽  
Trait Associations

Association analysis or linkage disequilibrium mapping is a method for identification of quantitative trait loci (QTLs) in a panel of divergent unrelated individuals based on historical recombinations during a crop?s domestication and selection. It should account for the population structure, which can be the result of adaptation to local conditions or selection, to reduce the possibility of declaring false-positive associations. The aim of this study was to determine potentially significant and consistent associations between markers and agronomic important maize (Zea mays L.) traits using association analysis in a diverse breeding material that can be ultimately implemented in maize selection. To this end, 96 maize inbred lines were evaluated in field trials at three locations in Serbia for eleven agronomic traits and analysed with microsatellite markers. Twenty five microsatellites were used to assess the population structure using Bayesian model-based clustering method and to test the significance of associations between the markers and the traits with general (GLM) and mixed linear (MLM) models. The cluster analysis divided maize inbred lines in four subpopulations, corresponding to the BSSS (Iowa Stiff Stalk Synthetic), LSC (Lancaster Sure Crop), Iodent heterotic groups and exotic and independent germplasm. The models identified associations between twenty five microsatellite markers and eleven agronomic traits, resulting in 133 and 71 associations across the environments for GLM and MLM, respectively. Some of the identified marker-trait associations were significant and consistent in several environments. The associations stable in several environments were identified between the markers bnlg1067 and two flowering traits; nc005 and bnlg434 and plant height, bnlg434 and ear height; bnlg1643 and umc1127 and leaf number, bnlg1360 and ear diameter; umc1019 and umc1506 and number of rows per ear; bnlg2305 and bnlg1451 and ear length, and between bnlg1175 and thousand-kernel weight. The results of this study indicate that these microsatellites could be used in marker-assisted selection of inbred lines, after validation of the marker-trait associations and testing combining abilities of the inbreds during hybrid development.

scholarly journals Genetic Diversity and Heterotic Orientation of South Africa Maize Inbred Lines Towards Tropical and Temperate Testers

2021 ◽  
Author(s):  
Siphiwokuhle Funani Shandu ◽  
John Derera ◽  
Kingston Mashingaidze ◽  
Edmore Gasura
Keyword(s):  
South Africa ◽  
Genetic Diversity ◽  
Grain Yield ◽  
Combining Ability ◽  
Molecular Genetic ◽  
Inbred Lines ◽  
Genetic Distances ◽  
Specific Combining Ability ◽  
Heterotic Groups ◽  
Maize Inbred Lines

Abstract An efficient hybrid breeding program defines and utilizes few heterotic groups. The objectives of this study were to determine genetic diversity and alignment of South Africa maize inbred lines collection towards tropical and temperate testers. Forty-two maize inbred lines were genotyped with 56110 single nucleotide polymorphism (SNP) DNA markers, using the Illumina MaizeSNP50 Bead chip. The 42 lines were crossed to two tropical and two temperate inbred line testers. The testcrosses were evaluated across seven environments, in South Africa, during 2014-2016. Genotypes and specific combining ability (SCA) effects of hybrids were significantly different (P<0.05) for grain yield. There was a weak correlation between molecular genetic distances and both grain yield mean and specific combining ability effects of hybrids, indicating that productivity of maize inbred lines could not be reliably determined based on molecular genetic distances. The SCA data was capable of classifying these maize inbred lines into three heterotic groups with respect to both tropical and temperate testers. Only a few lines could not be grouped on the basis of SCA data. The study also indicated high level of diversity among the maize inbred lines, which was shown by both the dendogram and molecular genetic distances. The SNP marker data classified the inbred lines into 11 clusters that could be simplified into three major groups of normal maize endosperm and two groups of quality protein maize (QPM) endosperm types. However, the SNP data indicated that maize lines were more aligned towards tropical than temperate inbred testers. This information would be useful for simplifying heterotic classification of the lines with profound implications for breeding progress.

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