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Association And Inheritance Of Several Agronomic Characters In Four Wheat Crosses
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Book Synopsis Association and Inheritance of Several Agronomic Characters in Four Wheat Crosses by : Mohammad M. El-Ajlouni
Download or read book Association and Inheritance of Several Agronomic Characters in Four Wheat Crosses written by Mohammad M. El-Ajlouni and published by . This book was released on 1986 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Inheritance mechanisms for fifteen plant characters of wheat (Triticum durum) Desf. were studied in the F2, F3, and F4 generations in four crosses derived from four parents grown in Jubeiha, University of Jordan Campus during 1984 and 1985 seasons. The parents are Hourani, Mexicali 75, Yamuna, and Njoro 227. Phenotypic associations between grain yield and its components were high, while the morpho-physiological traits have poor positive association with grain yield and its components. Estimates of broad sense heritability indicated low to high values for all traits except number of spikelets/spike, spike length, and flag leaf area which showed low to medium values. High heritability coupled with high genetic advance for some characters such as total seed number/plant, plant height, and main spike seed number and weight indicated that selection for these traits will be valuable. Some characters showed high values for additive gene action in some crosses which mean that selection for these characters could be practiced in early generation. In Hourani x Mexicali 75 cross, heritability values were high in most of the characters. This cross also showed strong association between grain yield and other characters."--Page iv.
Download or read book Agrindex written by and published by . This book was released on 1995 with total page 822 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Journal of Agricultural Research by :
Download or read book Journal of Agricultural Research written by and published by . This book was released on 1948 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Inheritance and Association of Earliness and Grain Yield in Four Winter X Spring Wheat Crosses (Triticum Aestivum L. Em Thell.) by : Ahmet Ertug Firat
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 Dirāsāt written by and published by . This book was released on 1987 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Biology and Utilization of Grasses by : V Younger
Download or read book The Biology and Utilization of Grasses written by V Younger and published by Elsevier. This book was released on 2012-12-02 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Biology and Utilization of Grasses reviews current knowledge about grass biology, and it highlights the important role of grasses in human existence. It discusses many fundamental aspects of grass biology, including evolution and genetics, morphology, physiology, and ecology, with emphasis on the relationship of these basic concepts to the use of grasses for forage, turf, and rangelands. Comprised of 28 chapters, this volume begins with an overview of the evolution and genetics of the grass family, followed by a discussion on practical grass-breeding problems. The reader is also introduced to vegetative growth and development of seedlings and mature plants; the ecological aspects of grasses; soils and mineral nutrition in relation to grass growth; the effects of defoliation (moving or grazing); carbohydrate reserves; physiology of flowering; and grass seed production and culture treatments. Other chapters consider the role of polyploidy in the evolution and distribution of grasses; selection and breeding of grasses for forage and other uses; seedling vigor and seedling establishment; environmental modification for seedling establishment; the microclimate of grass communities; effects on turf grass of cultural practices in relation to microclimate; and competition within the grass community. This book will be of benefit to plant breeders, ecologists, botanists, and biologists.
Book Synopsis A checklist of academic theses produced with support from CIMMYT 1966-2000 by : John E. Woolston
Download or read book A checklist of academic theses produced with support from CIMMYT 1966-2000 written by John E. Woolston and published by CIMMYT. This book was released on 2000 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agronomy written by and published by . This book was released on 1967 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Association and Inheritance of Earliness and Winterhardiness in Four Winter X Spring Wheat Crosses (Triticum Aestivum Vill., Host) by : Kamil Yakar
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.
Book Synopsis Journal of the American Society of Agronomy by : American Society of Agronomy
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.
Book Synopsis Fungal wheat diseases: Etiology, breeding, and integrated management, volume II by : Maria Rosa Simon
Download or read book Fungal wheat diseases: Etiology, breeding, and integrated management, volume II written by Maria Rosa Simon and published by Frontiers Media SA. This book was released on 2023-08-16 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Mode of Inheritance of Agronomic Characters in a Cross Between Hope and Federation Wheats with Emphasis on Linkage Relationships by : Joseph LaMar Chapman
Download or read book The Mode of Inheritance of Agronomic Characters in a Cross Between Hope and Federation Wheats with Emphasis on Linkage Relationships written by Joseph LaMar Chapman and published by . This book was released on 1948 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agriculture Handbook written by and published by . This book was released on 1949 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Set includes revised editions of some issues.
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1976 with total page 1732 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nature of Inheritance and Association of Time, Duration and Rate of Grain Filling and Subsequent Grain Yield in Crosses of Winter and Spring Wheats (Triticum Aestivum L. Em Thell) by : Byung Han Choi
Download or read book Nature of Inheritance and Association of Time, Duration and Rate of Grain Filling and Subsequent Grain Yield in Crosses of Winter and Spring Wheats (Triticum Aestivum L. Em Thell) written by Byung Han Choi and published by . This book was released on 1983 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: The nature of inheritance and possible associations for traits influencing earliness and grain yield were investigated using a four parent diallel of winter and spring wheat cultivars. More genetic variability was observed for the traits measured in segregating populations resulting from crosses between winter and spring type wheats in contrast to spring x spring or winter x winter crosses. The one exception was plant height where more genetic variability resulted from spring x spring crosses. Narrow sense heritability estimates were high for time and duration of heading, anthesis, grain filling and physiological maturity and for plant height. Smaller values were noted for rate of grain filling, kernel number, harvest index, tiller number, kernel weight, whole plant dry weight and grain yield. Estimates of the coefficient of heritability and the parent-offspring correlation coefficient were similar in magnitude except for the traits grain yield, tiller number, kernel weight and whole plant dry weight where large variations due to the environment were encountered. Using the Jinks-Hayman model, no maternal effects were noted nor were any nonallelic interactions observed for total duration of grain filling and lag period. The actual grain filling period was influenced to some degree by such interactions. The spring cultivars also appeared to have more dominant genes for longer total duration of grain filling and lag period. In contrast the winter parents had more dominant genes for the longer actual grain filling period. Estimates of general and specific combining ability provided similar evidence in terms of the nature of gene action. Both additive and nonadditive gene action was present for all traits, the relative magnitudes depending on the specific trait. Based on individual combining ability effects, the winter x spring cross Yamhill x Siete Cerros would appear to provide the highest proportion of desired segregates when combining earliness and acceptable grain yield. From the direct and indirect associations of grain yield, it would appear that a shorter duration of grain filling along with a shorter lag period from heading to anthesis are important for higher rates of grain filling if negative associations between earliness and grain yield are to be avoided.
Download or read book Oats written by and published by . This book was released on 1978 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Genomic selection and characterization in cereals by : Muhammad Abdul Rehman Rashid
Download or read book Genomic selection and characterization in cereals written by Muhammad Abdul Rehman Rashid and published by Frontiers Media SA. This book was released on 2023-05-10 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt:
