QTL for Meloidogyne Incognita Root Knot Nematode Resistance and Other Traits of Interest in Carrot (Daucus Carota) PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Root-knot nematodes (RKN, Meloidogyne spp.) are major pests attacking carrots (Daucus carota) worldwide, causing galling and forking of the storage roots, rendering them unacceptable for market. Genetic resistance could significantly reduce the need for broad-spectrum soil fumigants in carrot production. In this study genetic resistance to M. incognita was mapped. Three diverse sources of resistance, from Syria (HM), Europe (SFF) and South America (Br1091) were identified. Two F2 mapping populations were developed using these parents, (Br1091xHM1) and (SFFxHM2), as well as a segregating population derived from the self-pollination of a HM plant (HM3). Analysis revealed four QTLs conditioning resistance in Br1091xHM1, three in SFFxHM2, and three in HM3. A consensus genetic map of the three populations revealed five non-overlapping QTLs for M. incognita resistance, one each on carrot chromosomes 1, 2, 4, 8, and 9. One QTL was present in all 3 populations, in the same region of chromosome 8 as Mj-1 which imparts resistance to M. javanica. Along with M. incognita RKN resistance, the Br1091xHM1 and SFFxHM2 populations were segregating for several other traits of interest. Carrot root and shoulder color have important implications for nutritional value and marketable yield. Segregation patterns for orange versus yellow exterior root color revealed one QTL in both populations, on chromosome 3, along with two additional QTL detected in the SFFxHM2 population. Segregation for purple shoulder color revealed one QTL also on chromosome 3 in both populations with two additional QTL identified in SFFxHM2. An additional QTL for green shoulder color in Br1091xHM1 co-localized with the purple shoulder color QTL. Annual flowering and vernalization are important traits that have implications for root quality since, as flowering progresses, the root quickly lignifies. Evaluating early flowering in the field, early flowering in the greenhouse, and annual growth habit allowed mapping additional QTL in the Br1091xHM1 population that behave in a manner similar to days to flowering QTL identified in other crops. These additional studies lay the foundation for future research to validate and refine the QTL.
Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Root-knot nematodes (RKN, Meloidogyne spp.) are major pests attacking carrots (Daucus carota) worldwide, causing galling and forking of the storage roots, rendering them unacceptable for market. Genetic resistance could significantly reduce the need for broad-spectrum soil fumigants in carrot production. In this study genetic resistance to M. incognita was mapped. Three diverse sources of resistance, from Syria (HM), Europe (SFF) and South America (Br1091) were identified. Two F2 mapping populations were developed using these parents, (Br1091xHM1) and (SFFxHM2), as well as a segregating population derived from the self-pollination of a HM plant (HM3). Analysis revealed four QTLs conditioning resistance in Br1091xHM1, three in SFFxHM2, and three in HM3. A consensus genetic map of the three populations revealed five non-overlapping QTLs for M. incognita resistance, one each on carrot chromosomes 1, 2, 4, 8, and 9. One QTL was present in all 3 populations, in the same region of chromosome 8 as Mj-1 which imparts resistance to M. javanica. Along with M. incognita RKN resistance, the Br1091xHM1 and SFFxHM2 populations were segregating for several other traits of interest. Carrot root and shoulder color have important implications for nutritional value and marketable yield. Segregation patterns for orange versus yellow exterior root color revealed one QTL in both populations, on chromosome 3, along with two additional QTL detected in the SFFxHM2 population. Segregation for purple shoulder color revealed one QTL also on chromosome 3 in both populations with two additional QTL identified in SFFxHM2. An additional QTL for green shoulder color in Br1091xHM1 co-localized with the purple shoulder color QTL. Annual flowering and vernalization are important traits that have implications for root quality since, as flowering progresses, the root quickly lignifies. Evaluating early flowering in the field, early flowering in the greenhouse, and annual growth habit allowed mapping additional QTL in the Br1091xHM1 population that behave in a manner similar to days to flowering QTL identified in other crops. These additional studies lay the foundation for future research to validate and refine the QTL.
Author: Mychele Batista Da Silva Publisher: ISBN: Category : Languages : en Pages : 222
Book Description
The germplasm sources highly resistant to Meloidogyne incognita (Southern root-knot nematode) in Upland cotton (Gossypium hirsutum L) contain the resistance QTLs qMI-C11 and qMi-C14. Previous research documented resistance expressed at two stages of nematode development, and later research documented an epistatic interaction between the two QTLs, both of which suggest the QTLs have different modes of action. Our experiments demonstrated that qMi-C11 reduces the number of galls and egg masses, total egg production, and eggs/egg mass whereas qMi-C14 reduces the number of egg masses, total egg production, and eggs/egg mass without reducing galling. Fusarium oxysporum f. sp. vasinfectum (Fov) interacts with M. incognita resulting in increased Fusarium wilt (FW), therefore, we tested the effect of the nematode resistance QTLs on the severity of FW. A reduction of plant growth and an increase in FW severity was seen on all genotypes regardless of nematode resistance QTLs when coinfected with Fov and M. incognita. FW has been reported more frequently in Georgia in recent years, which suggests that something affecting the disease complex may have changed. In 2015 and 2016, a survey of Georgia cotton fields was conducted. The survey showed that Fov race 1 is still the dominant race, but Fov genotypes not previously reported in Georgia were found. Additionally, many instances of FW in Georgia are due to Fov interacting with Belonolaimus longicaudatus and not M. incognita as previously believed.
Author: Willem Pieter Steyn Publisher: ISBN: Category : Dissertations, Academic Languages : en Pages : 316
Book Description
This study was conducted to establish whether genetic resistance to root-knot nematode is present in local available Amaranthus-, Spinacea oleracea-, Beta vulgaris-, Daucus carota-, and Capsicum genotypes. Host suitability trials for the relevant vegetable genotypes were conducted in separate greenhouse studies. Different nematode parameters were used to select for root-knot nematode resistance but reproduction factors values (Rf) were used as main criterion
Author: Roberto Fritsche-Neto Publisher: Springer Science & Business Media ISBN: 3642330878 Category : Science Languages : en Pages : 166
Book Description
Experience shows that biotic stresses occur with different levels of intensity in nearly all agricultural areas around the world. The occurrence of insects, weeds and diseases caused by fungi, bacteria or viruses may not be relevant in a specific year but they usually harm yield in most years. Global warming has shifted the paradigm of biotic stresses in most growing areas, especially in the tropical countries, sparking intense discussions in scientific forums. This book was written with the idea of collecting in a single publication the most recent advances and discoveries concerning breeding for biotic stresses, covering all major classes of biotic challenges to agriculture and food production. Accordingly, it presents the state-of-the-art in plant stresses caused by all microorganisms, weeds and insects and how to breed for them. Complementing Plant Breeding for Abiotic Stress Tolerance, this book was written for scientists and students interested in learning how to breed for biotic stress scenarios, allowing them to develop a greater understanding of the basic mechanisms of resistance to biotic stresses and develop resistant cultivars.
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Author: G. R. Guru Prasad
Author: Lawrence William Yarger
Author: Min Wang
Author: Mychele Batista Da Silva
Author: Leonardo Silva Boiteux
Author: Willem Pieter Steyn
Author: BABULAL LAXMAN LAD
Author: Emmanuel Boache Chamba
Author: Roberto Fritsche-Neto