Predominance of a single major gene for resistance to Phakopsora pachyrhizi in a population of Glycine argyrea

Jarosz, A. M.; Burdon, Jeremy J.

doi:10.1038/hdy.1990.43

Cited by 52 publications

(21 citation statements)

References 18 publications

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“…However, this is a t Expected ratios of resistant to susceptible individuals, assuming independent segregation of known resistance factors. the presence of single resistance genes in the host population generated simple resistance-susceptibility profiles dominated by two or three phenotypes only (Parker 1988;Jarosz and Burdon 1990). In the third study, more complex and diverse phenotypic patterns of resistance and susceptibility were encountered (Burdon 1987b).…”

Section: Distribution Of Genes For Race-specificmentioning

confidence: 99%

“…A second problem that arises in understanding the evolutionary dynamics of host-pathogen interactions in natural communities is the question of the origin of these resistance genes. The resistance structure of populations ranges in complexity from those containing just one or two resistance genes (e.g., Amphicarpaea bracteata, Parker 1988; Glycine argyrea, Jarosz and Burdon 1990) to others in which many genes are present (e.g., Dinoor 1977;Burdon 1987b;Bevan et al 1993). The origin of the genes in the latter situations is a particularly intriguing problem, especially in species like L. marginale that typically occur in relatively small, discrete populations.…”

Section: The Evolutionary Origin Ofresistance Genesmentioning

confidence: 99%

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The Distribution and Origin of Genes for Race-Specific Resistance to Melampsora lini in Linum marginale

Burdon¹

1994

Evolution

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The genetic basis of resistance in wild flax (Linum marginate) to its host-specific pathogen Metampsora lini was investigated in seven lines collected from a single population growing at Kiandra, New South Wales and in an additional ten lines collected more widely across southeastern Australia. All lines showed different phenotypic patterns of resistance and susceptibility. Genetic analyses indicated the presence of single dominant genes for race-specific resistance in all but one of these lines. That particular line appeared to carry two linked dominant genes for resistance. Intercrosses between lines in each of these groups of L. marginate detected substantially more linkage between the resistance genes in the Kiandra population sample than between those in the broader geographic collection. This result is interpreted to indicate a possible mechanism whereby resistance genes are generated in natural populations.

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Section: Distribution Of Genes For Race-specificmentioning

confidence: 99%

Section: The Evolutionary Origin Ofresistance Genesmentioning

confidence: 99%

The Distribution and Origin of Genes for Race-Specific Resistance to Melampsora lini in Linum marginale

Burdon¹

1994

Evolution

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“…Empirical studies to test these predictions have yet to be carried out. To date, studies of natural plant-pathogen systems have documented the existence of variability for both resistance in host plants (Dinoor, 1970(Dinoor, , 1977Burdon et aI., 1983;Hunt and Van Sickle, 1984;Burdon, 1987b; Jarosz and Burdon, 1990) and, to a much lesser extent, , Present address: Department of Botany and Plant Pathology, Michigan State University, East Lansing, MI 48824-1312 USA. virulence in pathogens (Oates et aI., 1983).…”

mentioning

confidence: 99%

Host-Pathogen Interactions in Natural Populations of Linum marginale and Melampsora lini: II. Local and Regional Variation in Patterns of Resistance and Racial Structure

Jarosz¹,

Burdon²

1991

Evolution

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Spatial variation in the resistance structure of Linum marginale (wild flax) populations to the rust fungus Melampsora lini, and in the racial structure of this pathogen, was investigated by sampling 10 populations distributed throughout the Kosciusko National Park, New South Wales, Australia. Considerable differences were found among populations in the structure of both host and pathogen. Host populations were divided into three broad categories: (1) populations susceptible to all testing races; (2) populations containing a strictly limited number ofresistant phenotypes; and (3) populations with a considerable diversity ofresistant phenotypes. The pathogen populations also showed a range ofdiversity. The major differences between these populations were determined by the occurrence and frequency of four common races of pathogen (races A, E, K., and N). These differences were apparent both at a regional spatial scale (over the 100 km separation of the most distant populations) and at a local scale where major differences were detected between two populations only 300 m apart. The distribution of the four common races of M. lint was consistent with the hypothesis that a fitness cost was associated with unnecessary virulence. In general, however, differences in the structure of pathogen populations from genetically very similar host populations implied that, in addition to host resistance genes, other evolutionary forces are also important in determining the genetic structure of individual pathogen populations.

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“…Intraspecific genetic variation in plant defense to biological control agents (both pathogens and arthropods) can exist, and in cases has been detected with molecular markers (e.g. Jarosz & Burdon 1990; Bruckart et al . 2004; Goolsby et al .…”

Section: Introductionmentioning

confidence: 99%

Invasion of Lepidium draba (Brassicaceae) in the western United States: distributions and origins of chloroplast DNA haplotypes

Gaskin

Zhang

Bon³

2005

Molecular Ecology

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Advances in phylogeography are of great value for understanding the population structure and origins of invasive genotypes. Such insights provide constructive information for current or future biological control research efforts. In this study, we investigated a highly variable chloroplast DNA (cpDNA) marker for populations of the weed Lepidium draba (Brassicaceae) in its native Eurasian and invasive US ranges. We sequenced DNA from 684 individuals from Eurasia and the US and found 41 different haplotypes. Our comparative study between the native and invasive ranges showed a 33% reduction in allelic richness (A) and a 7% reduction in haplotype diversity (h) since introduction into the US. Most genetic variation in the native range was observed within geographical regions and populations, not between regions, and this result was similar for the invasive range. Assignment tests indicated the most likely origins of many invasive haplotypes. Some of these occurred in western Europe, supporting an expanded native range that had been proposed for the species. Exact locations were identified for a diverse set of invasive haplotypes which can be used in ongoing host-specificity tests of potential biological control agents.

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Predominance of a single major gene for resistance to Phakopsora pachyrhizi in a population of Glycine argyrea

Cited by 52 publications

References 18 publications

The Distribution and Origin of Genes for Race-Specific Resistance to Melampsora lini in Linum marginale

The Distribution and Origin of Genes for Race-Specific Resistance to Melampsora lini in Linum marginale

Host-Pathogen Interactions in Natural Populations of Linum marginale and Melampsora lini: II. Local and Regional Variation in Patterns of Resistance and Racial Structure

Invasion of Lepidium draba (Brassicaceae) in the western United States: distributions and origins of chloroplast DNA haplotypes

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