Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 18 of 18 for “"specific combining ability"”.
-
Experimental designs for population hybridization studies
… was to obtain information about (i) the general combining ability of populations, (ii) the specific combining ability of population crosses, (iii) the general combining ability of individuals, and (iv) the specific combining ability of individual crosses. These concepts were first introduced by …
-
Combining Ability for Ear Prolificacy and Response of Prolific Maize (Zea May L.) Hybrids to Low Nitrogen Stress
… cultivars for low N tolerance locally. The combining ability approach can be used as a tool for breeding desirable cultivars. In order to improve grain yield in maize, it is important to consider ear prolificacy which is a major yield component. Therefore this study was designed to estimate …
-
Barley Yellow Dwarf of Winter Wheat: Effects on Germplasm, and Inheritance, Combining Ability, and Reciprocal Effect for Tolerance to the Barley Yellow Dwarf Virus
… outstanding tolerance, though genetic variability for tolerance to the virus exists and seems to be quantitatively inherited. Heritability of tolerance is low under both fall and spring infection, but is higher under fall than spring inoculation. An interaction of entries with time of …
-
Combining ability for yeild of imidazolinone resistant maize inbred lines under artificial and natural striga infestation
… the study showed differences in both General Combining Ability (GCA) and Specific Combining Ability (SCA) effects for grain yield. GCA effects ranged from -0.57 to 0.78. SCA effects were different within each tester. The SCA effects with tester A, ranged from - 0.67 to 0.58, with tester B from …
-
Epistasis for agronomic traits in elite maize hybrids
… used. In addition, lines not highly selected for specific combining ability may not be expected to express epistasis as a fitness advantage. Epistasis in specific crosses, however, can lead to superior productivity and may be enough cause for modifying breeding programs to accommodate accumulation …
-
Combining ability, protein, heterosis, and prediction of F₁ performance with RFLPs in a diallel of maize
… first study, diallel analyses were used to study combining ability and types of gene action important in the inheritance of protein content, grain yield, grain moisture at harvest, time to silk, kernel hardness, and density. General combining ability (GCA) and specific combining ability (SCA) …
-
Diallel analysis of diplopodia ear rot resistance in maize and an assessment of the genetic variability of Stenocarpella maydis through isozyme analysis
… DER resistance, and examining the genetic variability of the fungus from isolates collected from the U.S. and the Republic of South Africa. DER developed in maize following inoculations with a spore suspension prior to flowering in both greenhouse and field evaluations. A spore suspension gave …
-
Combining ability study for the development of resistance to Aflation contamination by Aspergillus flavus link ex fries in groundnuts
… ranged from log(10) 4.11 to 4.78 cfu g-1 soil. Combining ability estimates of the parents for aflatoxin contamination registered significant (P<0.05) negative GCA effects for 55-437(-0.77), Ah 7223 (-1.46) and Katete (-1.95), while specific combining ability effects (SCA) of the crosses for the …
-
Combining ability study for the development of resistance to Aflation contamination by Aspergillus flavus link ex fries in groundnuts
… ranged from log(10) 4.11 to 4.78 cfu g-1 soil. Combining ability estimates of the parents for aflatoxin contamination registered significant (P<0.05) negative GCA effects for 55-437(-0.77), Ah 7223 (-1.46) and Katete (-1.95), while specific combining ability effects (SCA) of the crosses for the …
-
A genetic study of resistance to kernel infection by Aspergillus flavus in maize (Zea mays L.)
… parents contained the leafy gene (Lfy). From the combining ability analysis of the five maize parents and their 20 F1s, highly significant general combining ability (GCA), specific combining ability (SCA), and reciprocal effects were found. The analysis of genetic effects showed that the parents …
-
Genetics underlying flaking grit yield from dry milled maize grain
… corn dry basis. Narrow and broad sense heritability estimates for FGY were 0.53 and 0.65, respectively, indicating the importance of additive gene action for this trait. The general combining ability (GCA) variance for FGY was twice the size of the specific combining ability variance, …
-
Inheritance of Weevil Resistance in Maize
… analysis method 2 assuming fixed effects. Heritability and relative dominance estimates were made under random effects model. General combining ability(GCA) and specific combining ability(SCA)effects were significant for number of insects and weight loss at both infestation periods. At 63 days …
-
Inheritance of Weevil Resistance in Maize
… analysis method 2 assuming fixed effects. Heritability and relative dominance estimates were made under random effects model. General combining ability(GCA) and specific combining ability(SCA)effects were significant for number of insects and weight loss at both infestation periods. At 63 days …
-
Qualitative Resistance to Exserohilum Turcicum Race 2 in Maize (Corn, Genetics)
… with the Ht(,2) gene. Resistance genes and specific combinations of genes did not condition the same response to infection in all germplasm evaluated. Analysis of three diallel crosses involving four parents each showed specific combining ability effects to be important for lesion length, …
-
Inheritance of reactions to gray leaf spot and maize dwarf mosaic virus in maize and their associations with physiological traits
… additive and highly heritable. However, a strong specific combining ability component was found, indicating that the background of the material receiving resistance genes may have a strong effect on the expression of resistance. Inbreds capable of producing high-yielding, resistant, and …
-
Genetic Environmental Effects on Silage Productivity of Corn (Zea mays L.)
… quality corn silage. Mean squares of general combining ability (GCA) and specific combining ability (SCA) were highly significant for grain and stover yields. The GCA/SCA ratio for stover yield was much higher than that of grain yield, indicating that the GCA effect was more important than SCA …
-
Characterization and potential for the genetic improvement of pigeonpea (cajanus cajan ) landraces
… nutritive attributes of pigeonpea landraces. The specific objectives of the study were to: (i) determine the genetic diversity in agro-morphological attributes (ii) determine the genetic diversity in selected nutritive attributes among pigeonpea landraces (iii) characterize the seed storage …
-
Evaluation of additive and nonadditive genetic variation in elite maize germplasm for root, shoot, and ear characteristics
… of association mapping populations and the applicability of the population to the investigation of a wide range of traits. Analysis of genetic effects for the above ground traits is presented, along with a comparison of the F1 hybrids to current commercial hybrid checks. Significant heterosis was …