Author: Molla Assefa Mengistu
Publisher:
ISBN:
Category :
Languages : en
Pages : 119

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Author: Kailash Singh Tomar
Publisher:
ISBN:
Category :
Languages : en
Pages : 68

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Author: R. Babu
Publisher:
ISBN:
Category :
Languages : en
Pages : 88

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Author: Bullo Tulu
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659147401
Category :
Languages : de
Pages : 100

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Book Description
Information on the combining ability of elite germplasm is essential to maximize their use for variety development. In the current study, sixty-six F1 crosses resulted from diallel crosses of 12 QPM inbred lines and two standard checks BHQP-542 and Melkassa-6Q were evaluated using alpha-lattice design with two replications during the 2009 cropping season at Mechara Agricultural Research Center. The objectives of the study were to determine general(GCA) and specific (SCA) combining ability for yield and yield related traits; estimate correlation among yield and yield related traits and find direct and indirect effects of yield related traits on grain yield. Analysis of variance showed that mean squares due to entries were significant to highly significant for most traits studied, indicating mean squares due to entries, crosses and crosses versus checks were non significant for stand count after thinning, leaf rolling, number of kernels per ear, plant aspect, shelling percentage, number of ears per plant and disease score. Entry and cross mean squares were non significant for stand count at harvest and ear aspect.

Author: Y.R. Aruna
Publisher:
ISBN:
Category :
Languages : en
Pages : 79

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Author:
Publisher: CIMMYT
ISBN: 9706481605
Category : Corn
Languages : en
Pages : 60

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Author: Kathryn Michel
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Maize (Zea mays L.) yield is a highly quantitative trait controlled by many loci of small effect, the environment, and genotype by environment interactions, which make it a difficult trait to study at the gene level. However, yield may be broken into components such as ear and kernel size and shape, which are more heritable than yield measured in small plots. Multiparent advanced generation intercross (MAGIC) populations and diversity panels are two types of populations that are useful for identifying quantitative trait loci (QTL) that influence phenotypes. This dissertation contains three research projects designed to investigate the control of quantitative traits impacting maize yield. First, we present the genomes of five founders of a Stiff Stalk MAGIC population. Between the reference inbred B73 and the other five inbreds, we found substantial genetic and genomic variation in addition to conservation of haplotypes from the base population from which the inbreds were selected. Second, we describe the Wisconsin-Stiff Stalk-MAGIC population, its associated resources, and demonstrate QTL mapping and genomic prediction for flowering time and plant height. Flowering time and plant height are important characteristics in hybrid maize breeding, so we measured them in both the per se population and two test-crossed hybrid populations. We found that QTL detection depended on the tester used, which was consistent with lower genomic predictive ability when training models with per se data to predict hybrid phenotypes. Third, we used a high throughput image analysis pipeline to measure yield components on four MAGIC populations and a diversity panel. We performed genetic mapping to identify candidate genes underlying ear and kernel size and shape. We found substantial overlap of our results across traits within and between populations and overlap with known metaQTL identified through previous studies. The results from these projects provide new insight into the genetic control of traits including flowering time, plant height, and the size and shape of ears and kernels, all of which impact overall maize yield.

Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 860

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Author:
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 84

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Author: W.G. Pollmer
Publisher: Springer Science & Business Media
ISBN: 9789024722891
Category : Science
Languages : en
Pages : 532

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Book Description
A Seminar in the EEC Programme of Coordination of Research on Plant Protein Improvement