Download or read book Studies on Genetic Variability Correlation Ang Genotype X Environment Interaction in Bread Wheat Triticum Aestvum L em Thell written by Mamta Singh and published by . This book was released on 2001 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nature of Inheritance Genotype environment Interaction and Association of Selected Agronomic Characters in Crosses of Winter X Spring Wheats Triticum Aestivum L Em Thell written by P. Brajcich and published by . This book was released on 1980 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: This investigation was motivated by the apparent increase in genetic variability resulting from the systematic combining of gene pools represented by winter and spring types of wheats. It was the objective of this study to provide information regarding the nature of this genetic variability for nine agronomic characters in populations resulting from winter x spring crosses. Evaluations were made for: 1) the amount of total genetic variability; 2) the nature of the gene action making up this genetic variability using parent-progeny regression and combining ability analysis and 3) possible direct and indirect associations for traits which influence grain yield. Experimental populations which involved parents, Fl, F2 and backcross generations were grown at two locations where a spring and a winter environment could be utilized. At the winter site, the research was evaluated over a two year period. When the two experimental sites were compared, greater genetic diversity was observed at the spring site for maturity date, plant height, tillers per plant, kernel weight and grain yield. At the winter site, heading date, grain filling period, harvest index and kernels per spike were found to have more total genetic variation. From the expected mean square values, it would appear that the winter parents contributed more to the total genetic variation for most traits measured at both locations. A large genotype-location interaction was also noted suggesting that estimates of gene action and selection for adapted plant types can be done only at the specific winter or spring site. A large portion of the total genetic variation controlling the traits measured was due to additive gene action. However, at the winter site there was also a large influence of non-additive gene action associated with heading date, plant height, harvest index, tillers per plant, kernel weight, kernels per spike and grain yield. Of special interest was that at the winter site the most promising parental combinations could be predicted based on the general combining ability effects of the individual cultivars for each trait studied. Such data were not available for the spring site. Consistent and high correlations were observed between tillers per plant, kernels per spike and, to a lesser extent, kernel weight and grain yield at the winter location. Some negative associations were observed at the spring location between these traits and grain yield suggesting that yield component compensations were involved in the final expression of grain yield. The other characters measured did not reflect significant correlations with yield. When the correlation values were considered in terms of direct and indirect effects for specific traits, a large direct effect was noted for the three components and grain yield. The other traits exhibited small or no direct effects on grain yield but did have a slight influence on grain yield through tillers per plant, kernels per spike or kernel weight.
Download or read book Genetic Diversity and Effects of Selective Intermating on Genetic Variability in Bread Wheat Triticum Aestivum L Em Thell With CD Copy written by Preeti and published by . This book was released on 2018 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies on Genetic Variability Divergence and Character Association in Bread Wheat Triticum Aestivum L Em Thell written by Vikram Singh and published by . This book was released on 2000 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genotype X Environment Interaction on Bread Wheat written by Muluken Bayable Tadege and published by LAP Lambert Academic Publishing. This book was released on 2012 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stable genotype would not contribute much variation to the variance in productivity over a region. In practice, however, genotypes do usually interact with their environment and show wide variations in stability. Since crop productivity is usually subject to risk, breeders have to exploit the opportunity of genotype by environment interaction which describes how well each genotype will respond to different growing conditions. To analyze such interactions, a number of parametric and nonparametric statistical methods have been developed by different researchers. However, considerable debates of opinion still exist between the leading protagonists of the different statistical methods in identifying the best and most suitable procedure to be used for a specific data set or production environment. This Thesis work, therefore, provides information about the relationship among the various statistical methods. I hope this work will help plant breeders in judging which method will explain best for a specific data set and whether a genotype is widely or specifically adapted.
Download or read book Inheritance and Genotype environmental Studies of Test Weight and Related Kernel Characteristics in Soft Winter Wheat Triticum Aestivun L written by Ardeshir Ghaderi and published by . This book was released on 1969 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Variability for Terminal Heat Tolerance in Advance Lines of Bread Wheat Triticum Aestivum L em Thell written by Lalit Kumar and published by . This book was released on 2021 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies on Methods of Creating Variability and Genetic Analysis of Yield and Its Component Traits in Bread Wheat Triticum Aestivum L em Thell written by Sada Ram Verma and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1990 with total page 1842 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetics and Breeding for Crop Quality and Resistance written by Eucarpia. Congress and published by Springer Science & Business Media. This book was released on 1999 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book highlights the state of research in plant genetics and breeding and the results and applications of biotechnology procedures: i.e. achievements and perspectives of molecular biology and genetic engineering in the improvement of quantitative, qualitative and nutritional characters of crops, including their resistance to pests and diseases and their adaptation to different ecosystems. The book is divided into seven chapters. The first six are focused on the research aimed at improvement of resistance to Fungi, Bacteria, Nematode, Virus and Insect, and improvement of Quality. The latter was assigned two keynote lectures, respectively on agro-food quality and on quality of wood plants. Each chapter begins with a keynote paper. The seventh chapter includes the special lectures which opened and closed the Congress.
Download or read book Genetic Diversity and Heat Stress Tolerance Studies on Bread Wheat Tritivum Aestivum L em Thell With CD Copy written by Rutuparna Pati and published by . This book was released on 2022 with total page 0 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 1998 with total page 1212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Agriculture with Subject Index written by and published by . This book was released on 1987 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Diversity Studies for Some Physical and Yield and Its Component Traits in Bread Wheat Triticum Aestivum L Em Thell Under Late Sown Conditions written by M. S. Khumkar and published by . This book was released on 1999 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies on Genetic Variability for Drought Tolerance in Advance Lines of Wheat Triticum Aestivum L Em Thell With CD Copy written by Nithya P Arun and published by . This book was released on 2021 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Mutation and Hybridization on Variability in Bread Wheat Triticum Aestivum L Em Thell Under Normal and Salt Affected Soils written by Surat Singh Grakh and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genotype environment Interaction and Phenotypic Stability of Selected Winter Wheats Triticum Aestivium L Em Thell written by Mark J. Larson and published by . This book was released on 1997 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Extensive research has been devoted to evaluating potential genotype-environment interactions. However, plant breeders are still in need of a simple way to describe how genotypes respond to different locations and years. In an environmentally diverse state like Oregon, significant genotype-environment interactions do occur The resulting lack of association between actual and genotypic potential yield performance makes it difficult to select genotypically superior lines. This study was prompted to evaluate the extent of such an interaction and compare various yield stability models. A significant genotype-environment interaction encompassing lines, environments, and years was discovered for each individual year analyzed and for the combined analysis of 1992, 1994 and 1995, and 1989 through 1994. Most lines evaluated during 1992, 1994 and 1995 were adapted to low yielding environments. However, two genotypes (OR880172 and OR880525) exhibited broad adaptation. Stephens and Mac Vicar were less adapted to the relatively high yielding Chambers site than the other genotypes tested during 1992, 1994 and 1995 due to Septoria tritici infections. The most stable genotypes during the combined 1992, 1994 and 1995 and 1989-1994 seasons were OR870831, Madsen and OR8500933H. Gene was the most desirable genotype based on stability and yield for both the combined 1992, 1994 and 1995 and 1989-1994 seasons. Due to an inability to adapt to higher yielding environments, the cultivar Rohde was the least stable genotype during the same combined periods. High and low temperatures and precipitation had minor yet significant effects on yield responses at all three sites during various periods identified. Advanced winter wheat selections and cultivars were grown in three diverse environments and compared over different time periods. Due to trial design and the objective of identifying superior genotypes from a set tested in target environments a combination of two methods, stability variance and a selection index, emerged as the most appropriate techniques. These approaches are considered the most appropriate because they use the mean of the trial as a gauge for measuring stability.
