Genotype X Environment Interaction, Yield Stability and Adaption Responses of 25 Single-cross Maize (Zea Mays L.) Hybrids Grown in Michigan PDF Download
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Author: Kingstone Mashingaidze
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 372
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Author: Kingstone Mashingaidze
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 372
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Author:
Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 532
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Author: Jean Barbara Cormack
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ISBN:
Category :
Languages : en
Pages : 130
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Yield data from three experiments of maize single cross trials grown at 5 to 8 locations in 1994, 1995, and 1996 were analyzed for stability using regression methods. Only single crosses grown in all locations and years (environments) were included in the analyses. Effects for environments, genotypes, genotype x environment, heterogeneity of regression (slopes), and deviations from regression were tested for significance. Slopes and deviation from regression were calculated for each single cross and slopes were tested for equality to 0.0 and 1.0. Slopes sums of squares were subdivided into sums of squares due to concurrence and non-concurrence. Subsets of each experiment were also analyzed to examine whether stability changed in environments stratified by mean yield levels or by years. The analysis of one experiment revealed significant differences among single cross slopes and non-concurrence. The other two experiments were unusual in that the tests for heterogeneity of slopes were not significant.
Author:
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ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 1252
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Author: Kaushal Kishore Lal
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ISBN:
Category : Corn
Languages : en
Pages : 128
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![Genotype X Environment Interaction and Stability in Maize ( Zee Mays L.) Hybrids. [ with CD Copy ]. PDF](https://books.google.com/books/content/images/frontcover/oxxRewAACAAJ?fife=w80-h100)
Author: Shailendra Dadhich
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Category :
Languages : en
Pages :
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Author: Michael Cody McKee
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Category :
Languages : en
Pages :
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Maize (Zea mays L.) is one of the main crops grown in the United States. Genetic improvement over the last century has seen a shift from using open-pollinated varieties to single cross hybrids. This has resulted in major grain yield gains and improved management methodologies. However, there is still concern about reduced genetic diversity in elite corn germplasm and the potential effects this could have on future maize productivity in the presence of numerous abiotic and biotic pressures. One solution to this issue is the incorporation of exotic germplasm into existing maize improvement programs. This exotic material must be evaluated and characterized because too much or poorly matched exotic material can lead to reduced productivity. The use of multiple environments representative to the target improvement area is the best way to determine the true potential of certain material. The objectives of this research were to: i) estimate the responses of hybrids to aflatoxin and their agronomic performance across a range of environments under inoculation with Aspergillus flavus; ii) identify the hybrids within each group that exhibit the lowest levels of contamination; iii) analyze the relationship between agronomic performance and aflatoxin accumulation; and iv) determine how Genotype x Environment interactions affect these traits. Agronomic data was collected in ten Texas environments in 2005 for hybrids created from yellow, white, and Quality Protein Maize material that was crossed with one of two elite temperate inbred testers, LH195 or LH210. Response to aflatoxin was measured in eight of these environments. U.S. commercial hybrids were used as checks. Significant differences between hybrids were observed at different environments for different traits. Overall the experimental hybrids had lower aflatoxin accumulation than the commercial checks. They also yielded lower and had lower test weights and 1000 kernel weights. However, there were some hybrids that were competitive with the commercial checks for these agronomic traits. The incorporation of this material into established U.S. lines could be beneficial with regards to aflatoxin accumulation and kernel quality, which could ultimately translate to higher yields and crop quality. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/148414
Author: Zerihun Tadesse
Publisher:
ISBN: 9783846540992
Category :
Languages : en
Pages : 0
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Author: Javier Antonio Fernandez
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Category :
Languages : en
Pages : 0
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In maize (Zea mays L.), the largest staple crop in the world, nitrogen (N) represents a major limiting factor for productivity. However, improving N use efficiency (NUE) is still one of the most critical research issues to achieve food security in a context affected by climate change. This dissertation is structured in six chapters (Chapter 1, Introduction, and Chapter 6, Conclusions) outlining the agronomic and physiological traits associated with a better N utilization in US maize hybrids across Genotype x Environment x Management (G x E x M) conditions, with emphasis on the implications of long-term genetic selection. Chapter 2 presents a comprehensive meta-analysis on a diverse dataset assembled from field studies from 1983 until 2018 to compare early- versus late-season N (applied after tenth-leaf) fertilization effects on yield and N recovery efficiency. Results provided evidence for the lack of a main effect of late N application on yields but suggest the existence of crop growth conditions prone to a greater reproductive N uptake where this practice might be suitable. Throughout multiple field trials, Chapter 3-5 advanced in our understanding of how long-term genetic improvement has modified N dynamics across G x M scenarios. Chapter 3 proposes a novel N by carbon (C) framework to analyze and define key morpho-physiological traits of breeding interest that allow modern maize plants to achieve higher productivity and NUE. Results show both an earlier stem N remobilization and a decline in grain N concentration are key drivers of N utilization efficiency in modern hybrids. Chapter 4 documents the underlying fluxes of post-flowering N allocation and translocation dynamics behind genetic improvement over time in field-grown corn. This research suggests that direct selection for yield has indirectly favored N allocation to leaves in modern genotypes resulting in an improved post-flowering C accumulation. Finally, Chapter 5 explores historical changes in the contribution of grain weight and its physiological characteristics to maize genetic progress. This research evidences a significant contribution of increments in grain weight in US maize but concludes the trade-off between grain number and weight poses a challenge for future yield progress.
Author: Abdurahman Beshir Issa
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 242
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