Resistance to Root Knot Nematode (Meloidogyne hapla Chitwood) in Carrot Is Controlled by Two Recessive Genes

Wang, M.; Goldman, Irwin L.

doi:10.1093/oxfordjournals.jhered.a022966

Cited by 31 publications

(11 citation statements)

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“…Genetic studies of host–parasite relations in cultivated plants with respect to resistance to Meloidogyne very often revealed that a limited number of genes are operating (Sidhu & Webster, 1981) and more recently the same has been shown by Roberts et al . (1996) in Vigna unguiculata , Wang & Goldman (1996) in carrot and Cap et al . (1993) in tomato.…”

Section: Discussionmentioning

confidence: 93%

Breeding for resistance to Meloidogyne exigua in Coffea arabica by introgression of resistance genes of Coffea canephora

Bertrand¹,

Anthony

Lebailly

2001

Plant Pathology

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Breeding for resistance to root-knot nematode Meloidogyne exigua in coffee may help in controlling this nematode, which causes substantial harvest losses throughout Latin America. Accessions of Coffea arabica, C. canephora and lines derived from the Timor Hybrid (wild C. arabica £ C. canephora interspecific hybrid) were tested in a greenhouse for resistance to gall formation by counting individual galls on the roots of plants inoculated with secondstage juveniles of a M. exigua population from Costa Rica. The level of introgression from C. canephora was also assessed on 28 resistant and susceptible genotypes in a molecular study with amplified fragment length polymorphism (AFLP) markers. The frequency of resistant plants was very low or even nonexistent in C. arabica and very high in C. canephora with . 78% immune plants and 100% resistant plants. Several lines derived from the interspecific hybrid revealed a high level of resistance similar to that observed in the parent C. canephora species. A molecular study of Timor Hybrid-derived lines revealed high variability for the number of markers present in the study genotypes. A larger number of introgression markers was found in the group of resistant genotypes than in the susceptible genotypes. However, there were also lines with little introgression that had retained resistance. Based on genetic distances calculated from these markers, two groups of lines were revealed: those derived from Timor Hybrid CIFC1343, and those derived from Timor Hybrids CIFC832/1 and CIFC832/2, which may indicate the existence of different resistance genes in the two groups. The segregations observed in F 1 and F 2 progeny may be explained by at least a dominant gene. The lines derived from the Timor Hybrid are a worthwhile source of resistance to M. exigua that can be exploited to improve C. arabica with the help of molecular-assisted selection.

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Section: Discussionmentioning

confidence: 93%

Breeding for resistance to Meloidogyne exigua in Coffea arabica by introgression of resistance genes of Coffea canephora

Bertrand¹,

Anthony

Lebailly

2001

Plant Pathology

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“…Severa1 dominant or semidominant resistance genes have been identified and mapped to chromosomal locations or linkage groups (Table 1). For other sources of resistance, inheritance is polygenic or in some cases recessive (Trudgill, 1991;Kreike et al, 1993;Faghihi et al, 1995;Wang and Goldman, 1996). In some cases, polygenic resistance has been resolved into major genes, which are genetically dominant, and minor genes, which may modulate the response (Kreike et al, 1994;Webb et ai., 1995).…”

Section: Host Plant Resistancementioning

confidence: 99%

Nematode pathogenesis and resistance in plants.

1996

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“…Although the genedc basis of carrot resistance to M. hapla is known (Wang & Goldman, 1996), no resistant culdvars are commercially available for temperate regions. Without commercially available, nematoderesistant, carrot cultivars, with few sustainable management strategies and conducive cropping systems, and an unknown status against parasitic variability of M. hapla in current crops, growers face many challenges in maintaining a profitable, rotation-based, carrot production.…”

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confidence: 99%

Proof-of-concept for managing Meloidogyne hapla parasitic variability in carrot production soils

Melakeberhan

Wang

2013

Nematol

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Without resistant cultivars, conducive cropping systems and heterogeneous soils, managing parasitic vadability of Meloidogyne hapla is a major challenge in carrot production. In glasshouse studies we tested a hypothesis that knowledge of carrot cultivars' degrees of host suitability to populations of M. hapla could lead to developing site-specific management strategies. 'Sitespecific' encompasses production practices, soil conditions and nematode problems. Interactions between the carrot cvs Abledo, Abundance, Enterpdse, Eufora, Prodigy, Recoleta and Sugar Snax, and four M. hapla populations, Mh 1, Mh 2, Mh 3 and Mh 4, were examined. The tomato cv. Rutgers, in which the populations were cultured, was used as a nematode viability control. The first three populations were isolated from mineral soils and the fourth one from organic (muck) soil, all soils typical of carrot and other vegetable production in the US Midwest. While the reactions varied by population and by cultivar, the carrot cultivars proved to be hosts as suitable as, or more suitable than, cv. Rutgers tomato. All of the carrot cultivars were hosts as suitable as cv. Rutgers tomato to Mh 2, all but cv. Sugar Snax to Mh 3 and all but cvs Sugar Snax and Abundance to Mh 1. However, the Mh 3 infection levels in cv. Sugar Snax were as high as the Mh 2 infection levels. The cvs Sugar Snax and Abundance were the least suitable hosts for Mh 4 and Mh 1, and cv. Prodigy for Mh 4. The results suggest that identifying the reproductive potential of a resident M. hapla population is cdtical to making decisions about what carrot cultivars to plant as well as to minimise inoculum build-up in an infested field. The implications of the results across rotation crops are discussed.

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Resistance to Root Knot Nematode (Meloidogyne hapla Chitwood) in Carrot Is Controlled by Two Recessive Genes

Cited by 31 publications

References 0 publications

Breeding for resistance to Meloidogyne exigua in Coffea arabica by introgression of resistance genes of Coffea canephora

Breeding for resistance to Meloidogyne exigua in Coffea arabica by introgression of resistance genes of Coffea canephora

Nematode pathogenesis and resistance in plants.

Proof-of-concept for managing Meloidogyne hapla parasitic variability in carrot production soils

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