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Author: William Zebulun Rehrig Publisher: ISBN: 9781321363784 Category : Languages : en Pages :
Book Description
A major problem for the pepper (Capsicum annuum) industry is the root and crown rot disease caused by Phytophthora capsici (Pc), to which all commercial varieties suffer yield losses despite good management practices and available landraces with high levels of resistance. Introgression of genetic resistance from pepper landraces to cultivated varieties would benefit the growers and environment through reduced pesticide applications and increased crop value. Genetic linkage maps and a physical genomic map were employed to identify resistance loci and candidate genes conferring resistance. Pepper recombinant inbred lines (RILs) have been systematically screened for Pc resistance against a set of isolates collected from Mexico, New Mexico, New Jersey, California, Michigan and Tennessee. Quantitative Trait Loci (QTL) associated with effective resistance across isolates have been identified and validated with SNP markers across additional segregating populations. RNA-Seq data were also compared in resistant and susceptible bulks to evaluate differential expression leading to resistance. By leveraging transcriptomic and genomic information, we describe several candidate genes responsible for the major QTL on chromosome P5 for resistance to Pc. SNP markers for the resistant allele were validated to facilitate gene pyramiding schemes for recurrent selection in pepper.
Author: William Zebulun Rehrig Publisher: ISBN: 9781321363784 Category : Languages : en Pages :
Book Description
A major problem for the pepper (Capsicum annuum) industry is the root and crown rot disease caused by Phytophthora capsici (Pc), to which all commercial varieties suffer yield losses despite good management practices and available landraces with high levels of resistance. Introgression of genetic resistance from pepper landraces to cultivated varieties would benefit the growers and environment through reduced pesticide applications and increased crop value. Genetic linkage maps and a physical genomic map were employed to identify resistance loci and candidate genes conferring resistance. Pepper recombinant inbred lines (RILs) have been systematically screened for Pc resistance against a set of isolates collected from Mexico, New Mexico, New Jersey, California, Michigan and Tennessee. Quantitative Trait Loci (QTL) associated with effective resistance across isolates have been identified and validated with SNP markers across additional segregating populations. RNA-Seq data were also compared in resistant and susceptible bulks to evaluate differential expression leading to resistance. By leveraging transcriptomic and genomic information, we describe several candidate genes responsible for the major QTL on chromosome P5 for resistance to Pc. SNP markers for the resistant allele were validated to facilitate gene pyramiding schemes for recurrent selection in pepper.
Author: Jareerat Chunthawodtiporn Publisher: ISBN: 9781369615227 Category : Languages : en Pages :
Book Description
Bell pepper (Capsicum annuum) is a highly consumed vegetable in the U.S. However, it is also highly susceptible to many diseases. Phytophthora capsici is one of the major pathogens of bell pepper production. Introgression of sources of genetic resistance into commercial varieties is an effective approach for disease management. In this study, resistance loci for different isolates in a pepper recombinant inbred line (RIL) population, along with some desirable traits such as fruit size and unfavorable traits associated with the resistant parent, were identified. Quantitative trait loci (QTL) analysis identified the major components of P. capsici resistance, as well as components of resistance that were isolate-specific. QTL for organ (fruit and leaf) size clustered into a few loci in the pepper genome. The linkage map and correlation study revealed relationships among the traits. Genetic and physical genomic maps were used to investigate the candidate genes for all traits. R-gene complexes were proposed to contain the candidate genes for the resistance at the major QTL, whereas three genes on chromosomes 1, 2 and 3 were suggested for organ size. Combining the phenotypic and genotypic data from all traits, a RIL was selected for the resistant parent and crossed to bell-type varieties to develop marketable bell pepper lines containing broad genetic resistance for P. capsici.
Author: Michelle Renee Curtis Publisher: ISBN: 9781321608335 Category : Languages : en Pages :
Book Description
Root rot disease, caused by Phytophthora capsici, is a major disease of pepper (Capsicum annuum), an important vegetable crop. P. capsici is widespread in the US and increasingly in other pepper production areas of the world. Breeding of resistant pepper varieties with acceptable horticultural attributes has been difficult due to the quantitative nature of resistance, negative traits in resistant donor lines, and the genetic diversity of the pathogen. The main goals of this study were to locate P. capsici resistance QTL that are effective against diverse P. capsici isolates and determine linkage relationships among QTL for horticultural traits and resistance QTL. An F6 recombinant inbred line (RIL) population (n = 257), derived from an intraspecific Capsicum annuum F1 cross between P. capsici resistant Criollo de Morellos-334 and an elite dihaploid ancho breeding line, was evaluated in multiple disease screens using five different P. capsici isolates and in the field for horticultural traits (fruit length, fruit width, fruit shape, 10-fruit weight, and maturity). Twenty-five significant QTL (P
Author: Byoung-Cheorl Kang Publisher: CRC Press ISBN: 1466577452 Category : Science Languages : en Pages : 184
Book Description
Peppers and eggplants are two leading vegetable crops produced and consumed worldwide. To facilitate the breeding for agronomical traits such as disease resistance and quality, diverse molecular genetic studies have been carried out. Recent achievements on pepper genome sequencing and trait-linked marker development have enabled the cloning of genes involved in useful traits. This book explores the agronomical and evolutionary characteristics of peppers and eggplants and the results of molecular genetic studies. Topics include molecular linkage maps and candidate gene approaches in capsicum and the structure of the pepper genome.
Author: Gregory Martin Vogel Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Phytophthora blight, caused by the oomycete pathogen Phytophthora capsici, is a devastating disease of various vegetable crops, including squash (Cucurbita pepo) and pepper (Capsicum annuum). Options for host resistance to Phytophthora blight vary dramatically between these two crops. In squash, no sources of complete resistance have been described, although variation for quantitative disease resistance exists in both commercial and unadapted germplasm. In pepper, on the other hand, landraces demonstrating complete or near-complete disease resistance have been identified and used in breeding. However, varieties with durable resistance to diverse pathogen isolates have not been developed. In order to contribute to genetic solutions for disease control in these two crops, genetic variation in squash associated with quantitative disease resistance as well as genetic variation in P. capsici associated with virulence on distinct pepper genotypes were characterized. In squash, two quantitative trait locus (QTL) mapping approaches were used in a zucchini _ gray zucchini population, resulting in the discovery of six QTL, representing the first reported for Phytophthora blight resistance in C. pepo. In order to identify genetic variants in P. capsici associated with virulence on pepper, a collection of 252 pathogen isolates, predominantly from vegetable production regions of New York state, was genotyped at over 100,000 single-nucleotide polymorphism (SNP) loci using genotyping-by-sequencing. The utility of this isolate collection as a genetic resource was demonstrated by the successful identification of SNPs associated with mating type and sensitivity to the fungicide mefenoxam via a genome-wide association study (GWAS). Inoculation of 117 genetically distinct isolates onto a panel of 16 pepper accessions revealed a significant effect of inter-species genotype-genotype interactions on disease outcomes. However, the only SNP associated with virulence in a GWAS demonstrated an effect that was consistent across pepper genotypes, suggesting that genes involved in host-specific virulence may be of smaller effect and more challenging to map. The results of these genetic experiments - conducted on both pathogen and host - are expected to inform efforts to breed vegetable crops with durable Phytophthora blight resistance.
Author: Orarat Mongkolporn Publisher: CRC Press ISBN: 0429958935 Category : Science Languages : en Pages : 164
Book Description
Capsicum, more commonly as chili or chili pepper, is an important global vegetable and spice crop. Anthracnose disease, caused by a complex of Colletotrichum species, is the major biotic stress limiting chili production in tropical and subtropical countries. Anthracnose disease mainly manifests itself as a post-harvest disease, resulting in large necrotic lesions on the fruit. This disease is mainly controlled by the application of a "cocktail" of fungicides as commercial resistant cultivars are not available. In recent years, insights into the complexity of the pathogen and the genomics of the host have been accomplished using cutting-edge molecular technologies. The author has been at the forefront of this technology revolution in Capsicum breeding through her research to understand the host and pathogen which has led to the development of new anthracnose resistant genotypes. Capsicum: Breeding Strategies for Anthracnose Resistance is structured based on a review of the origin and evolution of Capsicum, Capsicum genetic diversity and germplasm resources, the latest research in the biology and taxonomy of Colletotrichum pathogens of Capsicum, and the classic and molecular breeding for resistance in Capsicum to the suite of Colletotrichum pathogens that infect Capsicum globally. This book brings together knowledge on both the pathogen and the host, which is often overlooked when reviewing the breeding and genetics of a crop plant. It informs the facts behind breeding for resistance from both the host and pathogen perspectives.
Author: Paul W. Bosland Publisher: Elsevier ISBN: 0443152799 Category : Science Languages : en Pages : 310
Book Description
Breeding Disease-Resistant Horticultural Crops is a complete and comprehensive resource for understanding the concept of breeding disease resistant crops, especially horticultural crops. Breeders of horticultural crops face distinct challenges that are different from agronomy/row crops, and these crops do not benefit from the vast body of literature available for agronomic crops. This book covers the basic theories that underpin breeding for disease resistance and features extensive real-world examples. Both classical and biotechnical breeding methods are covered, with an emphasis on how these methods are adapted for horticultural species. Presented in a logical flow for the reader, this book addresses historical perspectives and context as it relates to breeding for disease resistance. It highlights treatments of resistance in the context of the phenotype, the genotype, the pathogen, the environment interaction, sources of resistance, and the deployment of resistance to obtain a durable resistance. Explores the definition of horticultural "resistance", how it is inherited, and how resistance can be manipulated through breeding Highlights the importance of the interaction among crops, pathogens, and environmental elements Provides the latest references and insights as a foundation for further research
Author: William Zebulun Rehrig
Author: William Zebulun Rehrig
Author: Jareerat Chunthawodtiporn
Author: Michelle Renee Curtis
Author: Byoung-Cheorl Kang
Author: Gregory Martin Vogel
Author: Wing Yee Liu
Author: Linda Marie Donnelly
Author: Mojtaba Massoudi
Author: Orarat Mongkolporn
Author: Paul W. Bosland