Chromosomal identity and linkage relationships ofPto, a gene for resistance toPseudomonas syringaepv.tomatoin tomato

Pitblado, R.E.; MacNeill, B.H.; Kerr, E. A.

doi:10.1080/07060668409501590

Cited by 32 publications

(14 citation statements)

References 4 publications

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“…In tomato, resistance to /? s. tomato strains that express the avirulence gene avrffo (Ronald et al, 1992) is governed by the incompletely dominant Pto resistance locus on chromosome 5 (Pitblado et al, 1984;Carland and Staskawicz, 1993;Martin et al, 1993a). Pto was introgressed into Lycopefsicon esculentum cultivars from the sexually compatible resistant species L. pimpinellifolium (Pitblado and MacNeill, 1983).…”

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confidence: 99%

Tomato mutants altered in bacterial disease resistance provide evidence for a new locus controlling pathogen recognition.

et al. 1994

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We have employed a genetic approach to study the resistance of tomato to the phytopathogenic bacterium Pseudomonas syringae pv tomato. Resistance to I? s. tomato depends upon expression of the Pto locus in tomato, which encodes a protein with similarity to serinehhreonine protein kinases and recsgnizes pathogen strains expressing the avirulence gene avrPto. Eleven tomato mutants were isolated with altered resistance to I? s. tomato strains expressing avrPto. We identified mutations both in the Pto resistance locus and in a new locus designated Prf (for Pseudomonas resistance and fenthion sensitivity). The genetic approach allowed us to dissect the roles of these loci in signal transduction in response to pathogen attack. Lines carrying mutations in the Pto locus vary 200-fold in the degree to which they are susceptible to I? s. tomato strains expressing avrPto. The pto mutants retain sensitivity to the organophosphate insecticide fenthion; this trait segregates with Pto in genetic crosses. This result suggested that contrary to previous hypotheses, the Pto locus controls pathogen recognition but not fenthion sensitivity. Interestingly, mutations in the prf locus result in both complete susceptibility to I? s . tomato and insensitivity to fenthion, suggesting that Prf plays a role in tomato signaling in response to both pathogen elicitors and fenthion. Because pto and prf mutations do not alter recognition of Xanthomonas campestris strains expressing avrBsR an avirulence gene recognized by all tested tomato cultivars, Prf does not play a general role in disease resistance but possibly functionsspecifically in resistance against I? s. tomato.Genetic analysis of F2 populations from crosses of pto and prf homozygotes indicated that the Pto and Prf loci are tightly lin ked .

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Section: Introductionmentioning

confidence: 99%

Tomato mutants altered in bacterial disease resistance provide evidence for a new locus controlling pathogen recognition.

et al. 1994

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“…tomato is controlled by a single resistance locus, Pto (29). Pto was derived from the sexually compatible wild species Lycopersicon pimpinellifolium (28) and maps to the short arm of chromosome 5 at map position 30 (30). Our initial goals were to determine whether an avirulence gene in P. syringae pv.…”

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The cloned avirulence gene avrPto induces disease resistance in tomato cultivars containing the Pto resistance gene

et al. 1992

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“…Outbreaks that occur early in the season can decrease yields by up to 75%, and infections later in the season can greatly decrease marketability of the fruits (1,4). Host resistance to the pathogen was first identified in a wild species of tomato, Lysopersicon pimpinellifolium, and was found subsequently to be conferred by a single semidominant locus called Pto (5)(6)(7). The Pto locus has been introgressed into a numerous tomato cultivars and provides the primary and most effective control for bacterial speck disease (4).…”

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The disease-resistance gene Pto and the fenthion-sensitivity gene fen encode closely related functional protein kinases.

Loh

Martin

1995

Proc. Natl. Acad. Sci. U.S.A.

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Chromosomal identity and linkage relationships ofPto, a gene for resistance toPseudomonas syringaepv.tomatoin tomato

Cited by 32 publications

References 4 publications

Tomato mutants altered in bacterial disease resistance provide evidence for a new locus controlling pathogen recognition.

Tomato mutants altered in bacterial disease resistance provide evidence for a new locus controlling pathogen recognition.

The cloned avirulence gene avrPto induces disease resistance in tomato cultivars containing the Pto resistance gene

The disease-resistance gene Pto and the fenthion-sensitivity gene fen encode closely related functional protein kinases.

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