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Book Heterosis and Combining Ability in Maize Zea Mays L A Research

Download or read book Heterosis and Combining Ability in Maize Zea Mays L A Research written by T. Sandeep Kumar and published by LAP Lambert Academic Publishing. This book was released on 2013 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Maize Breeding Research........This book is purely based on maize breeding research which deals with selection of elite parents, generating crosses and understanding the gene action involved in the expression of traits. Further, association among various yield components in final expression of yield is explained. It is helpful for a new breeder to get a preliminary understanding on plant breeding research in developing new promising hybrids. Thank you my beloved Parents

Book Estimation Of Genetic Parameters In Maize

Download or read book Estimation Of Genetic Parameters In Maize written by F. M. Ali Haydar and published by LAP Lambert Academic Publishing. This book was released on 2014-06-10 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present study was carried out to obtain information about the performance of maize inbred lines, genetic diversity, gene action and assessment of the combining ability of parental lines and their F1s by using diallel fashion. Cob length, number of kernels/row and no. of grains/cob could be the important selection criteria in the improvement of maize lines and hybrids for higher grain yield. The average inter-cluster was always higher than the average intra-cluster distance suggesting wider genetic diversity among the inbred lines of the groups. From Wr-Vr graph it has been noticed that expression of dominant and recessive alleles in the parents was influenced by environment as the same parent showed different positions on graphs. From this study, it is concluded that parents with recessive and dominant genes can also contribute towards high yield. Only 5 crosses had higher grain yield. Of these crosses, P1xP2, P2xP5, P4xP5 and P5xP6 were considered promising hybrids and will be tested in yield trials for further evaluation.

Book Heterosis Combining Ability and Gene Action in Maize Zea Mays L

Download or read book Heterosis Combining Ability and Gene Action in Maize Zea Mays L written by and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Evaluation of Progress in Recurrent Selection for Specific Combining Ability in Two Open pollinated Maize Zea Mays L Varieties

Download or read book Evaluation of Progress in Recurrent Selection for Specific Combining Ability in Two Open pollinated Maize Zea Mays L Varieties written by Ronald N. Walejko and published by . This book was released on 1976 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: To decide upon the most efficient breeding and testing procedures to improve maize populations, the plant breeder must have adequate knowledge of the type of gene action involved in yield heterosis. Two types of gene action have been postulated to account for yield heterosis in maize: dominance and overdominance. Recurrent selection of specific combining ability and for general combining ability have been proposed as methods to improve maize populations. Recurrent selection for specific combining ability uses a narow genetic base tester and originally was proposed on the assumption that overdominance is the main type of gene action responsible for yield heterosis. Conversely, selection for general combining ability uses a broad genetic base tester and assumes that dominant, favorable factors are concerned in yield heterosis. A procedure was proposed to compare the relative importance of dominance and overdominance in yield heterosis. This procedure involved recurrent relection for specific combining ability in two heterozygous source populations with a common inbred line tester. The purpose of this study was to evaluate progress in 5 cycles of recurrent slection for specific combining ability in two open-pollinated maize varieties and to determine the type of gene action involved in yield heterosis. The two source populations were the open-pollinated varieties, Kolkmeier and Lancaster, and the inbred line, Hy, was used as the common tester. After 5 cycles of recurrent selection, 6 population (C0 to C5) from (...).

Book Heterosis and Combining Ability Studies on Grain Yield and Its Component Characters in Medium Duration Selected Inbred Lines of Maize Zea Mays L

Download or read book Heterosis and Combining Ability Studies on Grain Yield and Its Component Characters in Medium Duration Selected Inbred Lines of Maize Zea Mays L written by S. V. S. R. K. Netaji and published by . This book was released on 1998 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Combining Ability And Heterosis For Polygenic Characters In Maize

Download or read book Combining Ability And Heterosis For Polygenic Characters In Maize written by Jawahar Lal Jatoth and published by LAP Lambert Academic Publishing. This book was released on 2012 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Maize (Zea mays L.) is one of the most important cereal crop. Maize is used as human food, industrial raw material and animal feed. This indicates the importance of maize in the ever-increasing demand for food and warrants the development of new high yielding varieties and hybrids of maize. This book covers the heterosis and combinig ability in maize. Hope this book would be useful to researchers, teachers engaged in in the field of genetics and plant breeding. The Combining ability analysis is an important tool to identify parents with better potential to transmit desirable characteristics to the progenies and identify the best specific cross(s) for yield.

Book Heterosis and Combining Ability Studies in Quality Protein Maize QPM Zea Mays L

Download or read book Heterosis and Combining Ability Studies in Quality Protein Maize QPM Zea Mays L written by Mural Ravi and published by . This book was released on 2009 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Study of Combining Ability Heterosis Reciprocal Cross Effects and Genotype environment Interaction for Some Important Agronomic Characters in Maize Zea Mays L

Download or read book Study of Combining Ability Heterosis Reciprocal Cross Effects and Genotype environment Interaction for Some Important Agronomic Characters in Maize Zea Mays L written by Bhalla S K. and published by . This book was released on 1977 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Combining Ability Association Mapping and Genomic Predictions for Provitamin a Carotenoid Concentrations in Tropical Maize Zea Mays L

Download or read book Combining Ability Association Mapping and Genomic Predictions for Provitamin a Carotenoid Concentrations in Tropical Maize Zea Mays L written by and published by . This book was released on 2012 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developing biofortified maize cultivars is a promising approach to overcome the widespread problem of vitamin A deficiency in the developing world. The objectives of a first study were to: (1) evaluate whether molecular marker-based genetic distance separation of maize lines into heterotic groups results in heterosis among groups that could further be developed into a useful heterotic pattern, and (2) assess gene action (general and specific combining ability, GCA and SCA) for grain yield and provitamin A concentrations among inbred lines representing putative heterotic groups. A second, association mapping study was conducted to (3) identify genes and genic regions controlling variation for carotenoid concentrations, (4) use additive linear models of selected SNP markers to predict carotenoid concentrations of lines in breeding programs, and (5) assess the suitability of association mapping analysis models using four association mapping panels. To address objectives (1) and (2), 21 lines were crossed following a modified North Carolina Design II with six sets, where sets 1-3 contained crosses between putative heterotic groups, and sets 4-6 were crosses within groups. The resultant 152 hybrids were evaluated in two-replicate trials at four environments in Mexico. Significant but small yield advantage of among versus within putative heterotic group crosses (0.4 Mg ha-1, P0.05) confirmed that genetic distance can be useful, but that further breeding work would be needed to develop these groups into a useful heterotic pattern. GCA effects were significant for both provitamin A concentration and grain yield, whereas SCA effects were significant only for grain yield, indicating that provitamin A concentration is controlled primarily by additive gene action. For objectives (3) and (4), association mapping identified the zeaxanthin epoxidase gene (R2=0.14), and a significant marker (R2=0.10) located close to the [beta]-carotene hydroxylase gene, CrtRB1, as important regions determining carotenoid phenotypes. Additive linear models using selected SNPs accurately predicted carotenoid concentrations of maize lines (r=0.8, P

Book Combining Ability and Heterosis for Economic Traits in Maize Zea Mays L

Download or read book Combining Ability and Heterosis for Economic Traits in Maize Zea Mays L written by Ravish Kumar Singh and published by . This book was released on 2012 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: