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Dissertation/Thesis Abstract

Utilizing Wild Capsicum annuum Germplasm for Breeding Resistance to Beet curly top virus (genus: Curtovirus, family: Geminiviridae) in Cultivated Pepper (Capsicum annuum L.)
by Jimenez, Randi Catherine, Ph.D., University of California, Davis, 2018, 155; 10981748
Abstract (Summary)

Geminiviruses are the largest family of plant viruses and cause some of the most economically important diseases of crops. Beet curly top virus (BCTV) is the type species of the genus Curtovirus. BCTV affects more than 300 plant species and causes curly top disease in several economically important crops such as pepper, common bean, sugar beet, tomato and spinach. Curly top disease can be a major constraint of pepper production in the western and southern United States as well as northcentral and western Mexico where the disease has been documented for over a century. BCTV infection in pepper can result in yield losses ranging from 17-48%, depending on the stage of growth plants are infected. Breeding for resistance to BCTV is complicated by the diversity of BCTV strains and their prevalence, virulence, and host specificity. Only a few poorly characterized potential sources of moderate resistance to BCTV have been reported by researchers at New Mexico State University based on screening of various germplasm collections. In the present study, agroinoculation and beet leafhopper transmission methods were used to identify resistant wild pepper germplasm. Pepper F2 populations were systematically screened and genetically characterized for BCTV resistance against an isolate of the pepper-infecting BCTV strain BCTV-Pepper curly top [US-Cal-BV3-Tom-09] (BCTV-PeCT-BV3). Disease screening of three populations indicated a two-loci model for the resistance. Bulk segregant analysis of genotyping-by-sequencing data from one of these resistant populations indicated five QTL linked to the resistance trait. Identification and introgression of genetic resistance to BCTV from wild pepper accessions to cultivated varieties would benefit crop producers and the environment through reduced pesticide applications and costs, and reduced crop loss.

Indexing (document details)
Advisor: Van Deynze, Allen, Gilbertson, Robert L.
Commitee: Walker, M. Andrew
School: University of California, Davis
Department: Horticulture and Agronomy
School Location: United States -- California
Source: DAI-B 81/2(E), Dissertation Abstracts International
Subjects: Plant sciences, Plant Pathology, Genetics
Keywords: Agroinoculation, Beet curly top virus, Bulk segregant analysis, Capsicum annuum, Germplasm, Quantitative trait loci
Publication Number: 10981748
ISBN: 9781085722568
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