Download or read book The Inheritance of Winterhardiness Plant Height and Other Agronomic Characters in a Spring X Winter Barley Cross Hordeum Vulgare L Emend Lam written by Rashad Ahmed Abo-Elenein and published by . This book was released on 1965 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Inheritance of Cold Tolerance Plant Height Maturity and Other Characters in a Spring winter Barley Cross written by and published by . This book was released on 1967 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Publications of the Faculty and Staff written by University of Texas at Austin and published by . This book was released on 1964 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Plant Breeding Abstracts written by and published by . This book was released on 1967 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Inheritance of Cold Tolerance Plant Height Maturity and Other Characters in a Spring winter Barley Cross written by and published by . This book was released on 1967 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Faculty Publications written by Texas A & M University and published by . This book was released on 1964 with total page 120 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 1965 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissertation Abstracts written by and published by . This book was released on 1965 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstracts of dissertations and monographs in microform.

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 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 B written by and published by . This book was released on 1967 with total page 60 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 Bulletin written by and published by . This book was released on 1966 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissertation Abstracts International written by and published by . This book was released on 1970 with total page 1776 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 Influence on Grain Yields and Yield Components of Leaf Rust of Wheat and Crown Rust of Oats written by Charley V. Wootan and published by . This book was released on 1966 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Estimates of Genetic Variance and Heterosis in F1 Winter X Spring Barley Crosses Hordeum Vulgare L written by Moncef Mohamed Harrabi and published by . This book was released on 1977 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Four winter and four spring barley cultivars along with their F1 hybrids were grown on the Hyslop Agronomy Farm near Corvallis, Oregon, a high rainfall site (over 1000 mm annually) located in the Willamette Valley. The experiment consisted of four replications. Ten seeds of each F1 and parents were seeded in a three meter row. Plants were spaced 30 cm between and within the rows. Investigations were made to evaluate the presence of hybrid vigor when hybridizing winter and spring barley. Gene action estimates contributing to yield and its components were obtained. Additional information concerning the inheritance and the association of 12 agronomic traits and yield were also evaluated. The data were analyzed by using the factorial technique, analysis of variance, correlations, path-coefficient, parent-progeny regressions, and by polynomial and multiple regressions. The traits measured were: (1) total yield per plant, (2) kernel weight, (3) tiller number per plant, (4) kernel number per spike, (5) heading date, (6) plant height, (7) flag leaf area, (8) flag leaf width, (9) flag leaf length, (10) culm diameter, (11) head length, and (12) head extrusion. Heterobeltiosis was observed in all of the hybrids except in the cross between Adair and Short Wocus. The absence of hybrid vigor in this cross may be attributed to the fact that these two parents are closely related. Combining ability analysis as well as narrow sense heritability estimates indicated that additive gene action is more predominant in the expression of heading date, plant height, tiller number, head length, culm diameter, flag leaf width and kernel weight. Heterobeltiosis and high SCA estimates were observed in most of the hybrids for yield per plant and kernel number per spike. This implies that most of the genetic variation associated with these two traits resulted from non-additive gene action. The high SCA estimate observed for head extrusion indicates that this trait appeared to be controlled by non-additive gene action. Both additive and nonadditive gene action are important for the expression of flag leaf area and flag leaf length. When the 12 traits were correlated and the r values partitioned into direct and indirect effects it was observed that tiller number, kernel weight and kernel number per spike exerted the highest direct effect on yield. Plant height had a small positive direct effect, but an indirect effect on yield through kernel weight. It was further observed that a negative association exists between tiller number and kernel weight. This indicates that, in this barley population, it would be difficult to select for a plant containing large grain type and short stature, but it may be easy to select short plants with a relatively large number of tillers and high kernel number per spike. Path coefficient analysis indicated further that flag leaf area has a negative direct effect on yield and the remaining six traits have a negligible or no direct effect on yield, indicating that these traits can not be used as selection criteria. More genetic variability for tiller number and kernel number per spike was noted in the winter barley while more genetic variability for kernel weight was found in the spring barley. The results of this study suggest that increases in yield could be achieved by selecting plants with relatively high tiller number and high kernel weight. Selection for a high kernel number per spike can be accomplished by selecting for large culms and longer peduncle. By this procedure the breeder can take advantage of the additive genetic variance associated with tiller number and kernel weight and by the positive correlation that exists between culm size and peduncle length with kernel number per spike.