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" Multispectral Imaging and Genetic Analysis of Cultivated Chickpea Seed Traits "
Akhmetov, Zhaslan
Cook, Douglas R
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Latin Dissertation
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| Language of Document
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English
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| Record Number
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1106362
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TLpq2386391304
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| Main Entry
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Akhmetov, Zhaslan
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Cook, Douglas R
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| Title & Author
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Multispectral Imaging and Genetic Analysis of Cultivated Chickpea Seed Traits\ Akhmetov, ZhaslanCook, Douglas R
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| College
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University of California, Davis
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| Date
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2019
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| student score
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2019
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| Degree
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M.S.
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| Page No
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43
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| Abstract
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Multispectral Image Analysis of Cultivated Chickpea Seed Traits Cultivated chickpea (Cicer arietinum) is one of the world's most widely grown crops (FAO STAT 2014), with India, Australia, and Pakistan being the major producers of chickpea seeds. Genetic improvement of chickpea is constrained by low genetic diversity, resulting from a domestication and breeding bottleneck that removed >95% of genetic variation. Recently, wide-cross populations involving the domesticated species and its wild relatives, C. reticulatum and C. echinospermum, have been constructed as a pre-breeding resource (von Wettberg et al., 2018). Chickpea seed traits influence marketablitity and price. This project examined phenotypic variation and genetic control of seed coat traits (e.g., coat color and pattern) in wide cross F2 populations. Available evidence suggests that both color and pattern are the product of plant secondary metabolites, specifically flavonoid anthocyanins, produced in the maternal seed coat tissue. As seed coat color is a complex trait, seed coat reflectance was quantified using a multispectral imaging device to record nineteen wavelengths and the international standards for visual color CIE L*, a*, b*. Correlation analyses reduced this to a set of five minimally correlated wavelengths. Quantitative trait locus (QTL) mapping revealed a single major locus controlling seed patterning (spots) in both C. reticulatum and C. echinospermum, with the effect of additional epistatic loci observed but not genetically resolved. Seed coat reflectance is controlled by multiple loci. Two reflectance loci are operative across all analyzed populations, controlling near-infrared (780nm) and visual wavelengths, respectively, while several other loci were observed with population-specific effects. Analysis of genetic interactions suggests two networks of interacting genes operating to control seed coat reflectance.
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Agronomy
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Plant sciences
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