Download or read book Hybrid Performance Among Two rowed and Six rowed Winter Varieties of Barley Hordeum Distichum L Emend Lam and H Vulgare L Emend Lam written by Shu-Ten Tseng and published by . This book was released on 1970 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hybrid Performance Among Six rowed Winter Varieties of Barley H Vulgare L Emend Lam Varying in Kernel Size written by Wayne J. Crook and published by . This book was released on 1970 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Barley Newsletter written by and published by . This book was released on 1970 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1969 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The National Union Catalogs 1963 written by and published by . This book was released on 1964 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book National Union Catalog written by and published by . This book was released on 1968 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes entries for maps and atlases.
Download or read book National Agricultural Library Catalog written by National Agricultural Library (U.S.) and published by . This book was released on 1982 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1973 with total page 1244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Dissertation Index 1861 1972 Agriculture written by Xerox University Microfilms and published by . This book was released on 1973 with total page 1226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Grain Yield of Winter Barley Hordeum Vulgare L Emend Lam Analyzed by Adjacent Row Competition Experiments written by John Thomas Green and published by . This book was released on 1969 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Grain Yield of Winter Barley Hordeum Vulgare L Emend Lam Analyzed in Bi varietal Blends written by Manope Pavakul and published by . This book was released on 1970 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Evaluation of Heterosis for Grain Yield Total Leaf Area and Malting Quality in 21 Spring Barley Crosses written by Albert Eugene Carleton and published by . This book was released on 1966 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this study was to determine the amount of heterosis in three complex traits in barley and to investigate the concept of component interaction as a means of producing heterosis. The complex traits were grain yield, total leaf area, and malting quality. Seven varieties of spring barley were crossed in all possible combinations in the spring of 1963, The following year, the 21 F1's and seven parental varieties were space planted in a replicated, randomized block design in a greenhouse groundbed on the campus of Oregon State University. Since three of the seven parents were six-rowed barleys (Hordeum vulgare L., emend. Lam) and four were two-rowed barleys (Hordeum vulgare L., emend. Lam), crosses within and between six-rowed and two-rowed barleys were included in this study. The 21 crosses were separated according to their respective parental row numbers throughout this study. The evaluation of heterosis for the complex traits was made by the component approach. The amounts of heterosis for the complex traits were related to the expression of heterosis of their components. The association between components and the complex traits and between the different components, were determined by computing simple correlation coefficients. The direct and indirect relationships of the components to the complex traits were further analyzed by path coefficient analyses. Estimates of the type of gene action present for the complex traits, as well as for their respective components, were made by computing general and specific combining ability estimates and narrow-sense heritability estimates. Heterosis may occur in a complex trait even though none of the components of the complex trait exhibit heterosis. This situation has been called component interaction. When parental varieties do not differ in the complex trait but possess large differences in the components of the complex trait, component interaction may occur in the hybrid to produce heterosis in the complex trait. Additive expressions for the components in the hybrids of such parental varieties may result in the hybrids exceeding both parents in the complex trait. Large differences in the components of the three complex traits were found to exist among the parental varieties in this study while the parental varieties were not greatly different in the complex traits. These findings would suggest that component interactions were likely to occur in the hybrids produced by crossing the parental varieties. However, in this study, the expression of heterosis for the three complex traits was limited, with only a few crosses expressing a substantial amount of heterosis. The lack of heterosis, particularly in those crosses where the largest differences in the components existed between the parental varieties, could be ascribed to the failure to obtain an additive expression in the hybrid for the most important components. The relationships between the components of the complex traits also indicated that the components were not completely independent. The lack of independence of the components could also prevent component interactions. There were several crosses which did exhibit component interaction in the expression of heterosis for the complex trait but these were relatively few in comparison to those which did not exhibit component interaction. Estimates of gene action, in general, were in agreement with the observations of heterosis. Those traits which exhibited the most heterosis were found to be controlled mainly by non-additive gene action white those traits exhibiting a slight amount of heterosis were found to have large additive gene action estimates associated with them.
Download or read book Hybridization of Barley Hordeum Vulgare L Emend Lam with Its Wild Relatives written by Robert Parker Steidl and published by . This book was released on 1976 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Variety and Date of Planting on Yield and Winterhardiness Components of Winter Barley Hordeum Vulgare L Emend Lam written by Raeford G. Evans and published by . This book was released on 1969 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Inheritance of Plant Height in Barley Hordeum Vulgare L Emed LAM written by Ali Bayraktar and published by . This book was released on 1972 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Four, six-rowed, spring barley cultivars were used as parental material in this study. The parents were distinctly different in plant height. Washington-6124-62 is a standard height selection while Short Wocus and Minn. 66-102 are intermediate. The fourth parent was a dwarf selection obtained from India. The two intermediate cultivars and the dwarf cultivar were crossed to the tall parent, Wa-6124-62, with a portion of the F1 progeny backcrossed to the shorter parent. In addition, the intermediate parent, Short Wocus, was crossed to Indian Dwarf. The following generations were available for study: parents, BC1F1, F1, and F2. The purpose of this study was to obtain information concerning the inheritance of plant height and to determine when selection for this trait could be made in the breeding program most effectively. To achieve this objective heritability and the mode of gene action were studied as well as number of genes segregating for plant height. The effect of temperature on plant height was also investigated in a growth chamber utilizing two temperature levels, 19° C and 30° C. Plant height was recorded on an individual plant basis at two sites that were distinctly different environmentally and in the growth chamber. The number of nodes were counted, and the length of internodes measured for genetic interpretation of culm length. Broad sense heritability values for plant height of each cross were estimated by using the variance of parents, F1's and F2' s. Heritability values were quite high in the F2 generation ranging from 50 to 90 percent, and suggest that plant phenotype gave a relatively good indication of the genotype for plant height. Height of the F1 plants was between the mid-parent and tall parent indicating partial dominance for tall culm length. In earlier studies, many investigators found that additive gene action was the major component of genetic variability for plant height. Results obtained from this study suggest that the nature of gene action is a function of the parents used. Where large differences exist between parents, plant height appeared to be largely influenced by non-additive gene action. When the parents were similar in height the trait was controlled mainly by additive gene action. Fairly discrete height classes in the segregating populations indicated that plant height was controlled by only a few genetic factors in these populations. Ratios obtained from segregating populations suggested the presence of three recessive genetic factors for short height in the dwarf parent (Indian Dwarf). The tall parent, Wa-6124-62, and intermediate parent, Minn. 66-102, appeared to differ for plant height by one major genetic factor. Difference in height among the cultivars was mostly due to difference in internode length rather than the number of nodes. It was concluded that the rather simple inheritance of plant height in barley will allow effective selection in the F2 generation for short stature, and progress to develop semi-dwarf barley cultivars should be possible if stiffness of straw can also be obtained along with short stature. In the cross between the tall and dwarf parent, selection for intermediate plant height would be more effective if delayed for several generations of selfing due to the relatively large dominance component of genetic variance.
Download or read book Optimum Culm Number in Barley Hordeum Vulgare L Emend Lam written by John Herman Pfund and published by . This book was released on 1974 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Heterozygosity on Phenotypic Stability in Spring Barley written by Garry Austin Smith and published by . This book was released on 1968 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of heterozygosity on the phenotypic stabilities of six morphological plant characteristics was studied in hybrid crosses of two self-pollinated barley species Hordeum vulgare L., emend Lam. and Hordeum distichum L., emend Lam. Experimental material consisting of parents and their F1 diallel progeny were grown at two field locations and one greenhouse location in the spring of 1967. The phenotypic stability for plant height, kernels per spike, kernel weight, grain yield per plant and awn length was determined by the use of two statistics, the standard deviation, and the coefficient of variation. These statistics were computed on each individual plot based on measurements taken from three plants per plot. The mean coefficient of variation and standard deviation values representing the phenotypic stability of each of the entries were compared at each of three locations and across the three locations. Analyses of variance facilitated the comparison of four groups. Two of the four groups were composed of homozygous genotypes (parental groups) and two of the groups were composed of highly heterozygous genotypes (6 X 6 and 2 X 2 crosses). The associations between the phenotypic stabilities of all characteristics measured were studied by the use of linear correlations. Further, associations between the mean values of each characteristic measured and its phenotypic stability were determined. In addition, the association between the two statistics coefficient of variation and standard deviation utilized in this study as a basis of measuring phenotypic stability was determined by correlation studies. The results of this research indicated that the phenotypic stability of heterozygotes as a group was neither greater nor less than the homozygotes for any morphological characteristic when compared across the three locations. This would suggest that heterozygosity per se does not influence phenotypic stability over rather diverse environments. On the other hand heterozygosity did increase the phenotypic variation of kernel weight and plant height at the Klamath Falls field location. And, the phenotypic variation of tiller number was increased at the Corvallis field location. The phenotypic stability of heterozygotes and homozygotes was greatest for all characteristics measured under the minimal environmental stress at the greenhouse location. The phenotypic stability of kernel weight, plant height, kernels per spike and awn length were associated. Evidence also indicated associations between the phenotypic stability of plant height and the phenotypic stabilities of kernels per spike and awn length. Additional evidence indicated that the phenotypic stabilities of kernels per spike and awn length were associated. This association among the phenotypic stability of several plant characteristics may suggest a common control mechanism for phenotypic stability within the plant. If as the evidence indicated, the phenotypic stability of several plant characteristics are associated, the selection for levels of phenotypic stability of one plant characteristic could lead to increased stability for certain other plant characteristics. It was found that the parents used in a hybrid barley cross can influence the phenotypic stability of the hybrid. These results suggest the possibility of selecting parents which when crossed would result in hybrids which exhibit high phenotypic stability for particular morphological characteristics. The coefficient of variation and standard deviation were highly associated when used to measure phenotypic stability. The coefficient of variation was the most reliable of the two statistics because it was not influenced by the size of the mean as was the standard deviation.
