Download or read book A Study of the Inheritance of Earliness in Certain Varieties of Spring Wheat written by Fayette Ellsworth Stephens and published by . This book was released on 1926 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Inheritance of Earliness in Certain Varieties of Spring Wheat written by Fayette Ellsworth Stephens and published by . This book was released on 1927 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Inheritance of Earliness and Other Characters in Spring Wheat written by Joseph Edgar Chevrette and published by . This book was released on 1941 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of the American Society of Agronomy written by American Society of Agronomy and published by . This book was released on 1927 with total page 1186 pages. Available in PDF, EPUB and Kindle. Book excerpt: An international journal of agriculture and natural resource sciences.
Download or read book Laboratory Papers V 1 written by Cornell University. Department of Plant Breeding and published by . This book was released on 1924 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Inheritance and Association of Earliness and Grain Yield in Four Winter X Spring Wheat Crosses Triticum Aestivum L Em Thell written by Ahmet Ertug Firat and published by . This book was released on 1977 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Parental and segregating populations derived from four winter x spring wheat crosses were investigated to obtain information concerning the inheritance and association of earliness, grain yield and yieldrelated traits. Feasibility of selecting in early generations for these characteristics was also evaluated. Four winter wheat cultivars (Hyslop, Yamhill, Bezostaia 1, and Sprague) and one spring wheat cultivar (Inia 66) were chosen on the basis of their relative maturity and contrasting agronomic characteristics. Parents, F1 s, F2' s, and reciprocal backcrosses to both parents were planted in the fall in a space-planted randomized complete block design. The two environmentally diverse locations selected were the Hyslop Agronomy Farm, Corvallis, Oregon (1000 mm of rainfall) and Sherman Experimental Station, Moro, Oregon (250 mm of rainfall). The effectiveness of early generation selection for the measured characteristics was evaluated by growing F3 lines identified as the earliest 1% and the highest yielding 1% of F2 individuals in each cross. These were grown along with the parents, F1s, BC1 s, BC2 s and F2' s under space-planted conditions at Hyslop Agronomy Farm. A study with the same populations was conducted by vernalizing and planting in the spring to gain further information on earliness. Analyses of variance were conducted for all characteristics measured. Frequency distributions for days to heading of F1, F2, backcross generations and parents were examined. From the data collected, estimates of F 1 -midparent deviations, degree of dominance, heritability in the narrow sense and genetic advance under selection were determined for each cross. The data were further analyzed by parent-progeny regression, correlation and path-coefficient analyses, polynomial and multiple regressions. Partially dominant major genes, varying in number between one to five depending on the particular cross, appeared to influence heading date. Modifying factors also seemed to affect the date of heading. The gene action involved in the inheritance of earliness was primarily additive indicating that selection for earliness would be effective as early as the F2 generation under both high and low rainfall conditions. Estimates of additive and nonadditive gene action suggested both were equally important in determining the yield components. Higher heritability estimates for the components of yield indicated that there was more genetic variability associated with the yield components than yield per se. Occurrence of additive genetic variation by location interaction implied that selection should be practiced simultaneously under different environments if wide adaptability of potential lines is desired. Since pronounced additive effect by year interactions occurred for the yield components, delayed selection for these traits may not be productive. Positive correlations were obtained between yield and the number of days to heading when all generations were combined. However, in the F2 generations, it appeared possible to select for the desired earliness with high yields as indicated by the low association between these two traits. The path-coefficient analyses suggested that tiller number had the highest direct effect on grain yield. However, because of a negative association between tiller number and kernel weight, selection pressures would have to be balanced between these two components. In most cases, linear relationships existed between grain yield and seven measured traits, respectively. The result of regression analyses also showed that grain yield may be described best as a linear function of its components.
Download or read book Journal of Agricultural Research written by and published by . This book was released on 1941 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies on the Inheritance of Earliness in Wheat written by Victor Homer Florell and published by . This book was released on 1923 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Association and Inheritance of Earliness and Winterhardiness in Four Winter X Spring Wheat Crosses Triticum Aestivum Vill Host written by Kamil Yakar and published by . This book was released on 1976 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this study was to determine the nature and amount of genetic variation and possible associations between winterhardiness and earliness in winter x spring wheat crosses. Four winter wheat cultivars selected for differences in earliness and winterhardiness were crossed with a nonhardy, day length insensitive spring wheat cultivar. The following year, experiments containing parents, F1, BC, and F2 populations were planted at two environmentally diverse sites located at the Sherman Branch Experiment Station, Moro, Oregon (250 mm of moisture) and the Hyslop Agronomy Farm, Corvallis, Oregon (1000 mm of moisture). The amount and nature of genetic variation involved were determined by obtaining broad and narrow sense heritability estimates, evaluating the degree of dominance and estimating the number of genes influencing both earliness and winterhardiness. Also frequency distributions were developed for each of the populations. Both broad and narrow sense heritability estimates for earliness were higher than those observed for winterhardiness. Both winterhardiness and earliness appeared to be conditioned by both additive and nonadditive gene action. Degree of dominance estimates for the four wheat crosses grown at two locations differed for each cross and location. Earliness was influenced by one to six genes while winterhardiness appeared to be controlled by two genes. The estimation of genetic advance indicated that the crosses with high narrow sense heritability estimates and high phenotypic variance in F2 generation would result in greater gains under selection for both traits. Based on the results of this study, it seems that Moro is a proper site to select for winterhardiness and Corvallis for earliness. However, it might be better to select for both traits at the same time at another site such as Pendleton, Oregon, where a realistic selection pressure can be applied for winter survival and drought would not influence the selection procedure. Such a site could also provide an opportunity to evaluate earliness at the same time. Correlation coefficient estimates showed the presence of a positive association between earliness and winterhardiness. The possibility of using leaf damage readings to measure the winterhardiness levels in wheat populations also appears promising.
Download or read book Technical Note written by and published by . This book was released on 1926 with total page 1072 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Research written by and published by . This book was released on 1936 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Inheritance Studies of Earliness Bunt Resistance Awns and Phenol Colour Reactions in a Spring Wheat Cross written by Frederick Gfeller and published by . This book was released on 1936 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bulletin written by Charles Franklin Noll and published by . This book was released on 1925 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bulletin written by and published by . This book was released on 1924 with total page 968 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experiment Station Record written by U.S. Office of Experiment Stations and published by . This book was released on 1933 with total page 1024 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Collected Papers of the Associate Committee on Grain Research written by National Research Council Canada. Associate Committee on Grain Research and published by . This book was released on 1935 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Inheritance of Earliness and Grain Filling Period in Spring Wheat Crosses written by Ahmed Leghari Maqbool and published by . This book was released on 1982 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
