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RISS 인기검색어
- 검색키워드
- 저자 : Al-Ajlouni, Zakaria Ibrahim (검색결과 3 건)
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The effect of semidwarfing genes in wheat on plant height in diverse environment in Nebraska
Al-Ajlouni, Zakaria Ibrahim The University of Nebraska - Lincoln 2008 해외박사(DDOD)
Semidwarfing genes (most commonly Rht-B1b (Rht1), Rht-D1b (Rh2), and Rht8) and other semidwarf genes (Rht4, Rht5, Rht12, and Rht13) modify plant structure; reduce plant height; decrease lodging; and can increase harvest index, biomass, and grain yield in wheat (Triticum aestivum L.). In this study, sixty adapted wheat genotypes that were common to two advanced wheat breeding nurseries; Nebraska Interstate Nursery (NIN) and Nebraska Triplicate Nursery (NTN), were grown in 2004 and 2005 at six locations in Nebraska (Alliance, Clay Center, Lincoln, Mead, North Platte, and Sidney) using an randomized complete block design to measure their plant height and grain yield. The environment, genotypic effects and their interactions were significant (P<0.05) for both traits. To determine if the semidwarf genotypes respond differently to the environment, the sixty genotypes were assayed using GA3 and molecular markers to establish the presence of Rht-B1b and, Rht-D1b (GA insensitive); Rht8, Rht4, Rht5, Rht12, and Rht13 (GA sensitive). The response to the environment was determined using stability analyses using linear regression (slope). The genotypic plant height means for semidwarf genotypes ranged from 72.5 to 89.3 cm and for nonsemidwarf genotypes from 78.6 to 94.4 cm. The correlation coefficients for plant height measurements in eastern Nebraska poorly predicted plant height in western Nebraska. The genotypic range of slope values for environmental stability for all the genotypes ranged from 0.76 to 1.33. Of the 60 genotypes, 49 were classified as the Rht-B1b which was the most common gene in our genotypes and it reduced plant height by 8.5% compared to the nonsemidwarf genotypes. There were 9 genotypes without Rht-B1b and Rht-D1b markers and they were GA-sensitive. We found no significant difference among Rht8 marker alleles, no reduction associated with the Rht5 marker, small but significant height reductions associated with the markers linked to Rht12, and Rht13 markers, and a small increase in plant height associated with the Rht4 marker indicating the markers were not diagnostic in this population.
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Al Ajlouni, Rima Ahmad Texas A&M University 2005 해외박사(DDOD)
For the purpose of cultural heritage preservation, the task of recording and reconstructing visually complicated architectural geometrical patterns is facing many practical challenges. Existing traditional technologies rely heavily on the subjective nature of our perceptual power in understanding its complexity and depicting its color differences. This study explores one possible solution, through utilizing digital techniques for reconstructing detailed historical Islamic geometric patterns. Its main hypothesis is that digital techniques offer many advantages over the human eye in terms of recognizing subtle differences in light and color. The objective of the study is to design, test and evaluate an automatic visual tool for identifying deteriorated or incomplete archaeological Islamic geometrical patterns captured in digital images, and then restoring them digitally, for the purpose of producing accurate 2D reconstructed metric models. An experimental approach is used to develop, test and evaluate the specialized software. The goal of the experiment is to analyze the output reconstructed patterns for the purpose of evaluating the digital tool in respect to reliability and structural accuracy, from the point of view of the researcher in the context of historic preservation. The research encapsulates two approaches within its methodology; Qualitative approach is evident in the process of program design, algorithm selection, and evaluation. Quantitative approach is manifested through using mathematical knowledge of pattern generation to interpret available data and to simulate the rest based on it. The reconstruction process involves induction, deduction and analogy. The proposed method was proven to be successful in capturing the accurate structural geometry of the deteriorated straight-lines patterns generated based on the octagon-square basic grid. This research also concluded that it is possible to apply the same conceptual method to reconstruct all two-dimensional Islamic geometric patterns. Moreover, the same methodology can be applied to reconstruct many other pattern systems. The conceptual framework proposed by this study can serve as a platform for developing professional softwares related to historic documentation. Future research should be directed more towards developing artificial intelligence and pattern recognition techniques that have the ability to supplement human power in accomplishing difficult tasks.
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