Venturia Inaequalis (Cke.) Wint. I. A Groundwork for Genetic Studies

Keitt, G. W.; Langford, M. H.

doi:10.1002/j.1537-2197.1941.tb11011.x

Cited by 38 publications

(2 citation statements)

References 19 publications

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“…Tools for the dissection of the V. inaequalis-Malus interaction at the molecular level are available. The pathogen can be cultured easily and, as mentioned above, induced to sexually cross in vitro (Keitt and Langford, 1941;Keitt and Palmiter, 1938).…”

Section: Introductionmentioning

confidence: 99%

Venturia inaequalis: the causal agent of apple scab

Bowen

Mesarich

Bus

et al. 2010

Molecular Plant Pathology

159

117

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Teleomorph: Venturia inaequalis Cooke (Wint.); Kingdom Fungi; Phylum Ascomycota; Subphylum Euascomycota; Class Dothideomycetes; Family Venturiaceae; genus Venturia; species inaequalis. Anamorph: Fusicladium pomi (Fr.) Lind or Spilocaea pomi (Fr.). LIFE CYCLE: V. inaequalis is a hemibiotroph and overwinters as pseudothecia (sexual fruiting bodies) following a phase of saprobic growth in fallen leaf tissues. The primary inoculum consists of ascospores, which germinate and penetrate the cuticle. Stromata are formed above the epidermal cells but do not penetrate them. Cell wall-degrading enzymes are only produced late in the infection cycle, raising the as yet unanswered question as to how V. inaequalis gains nutrients from the host. Conidia (secondary inoculum) arise from the upper surface of the stromata, and are produced throughout the growing season, initiating multiple rounds of infection. VENTURIA INAEQUALIS AS A MODEL PATHOGEN OF A WOODY HOST: V. inaequalis can be cultured and is amenable to crossing in vitro, enabling map-based cloning strategies. It can be transformed readily, and functional analyses can be conducted by gene silencing. Expressed sequence tag collections are available to aid in gene identification. These will be complemented by the whole genome sequence, which, in turn, will contribute to the comparative analysis of different races of V. inaequalis and plant pathogens within the Dothideomycetes.

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Section: Introductionmentioning

confidence: 99%

Venturia inaequalis: the causal agent of apple scab

Bowen

Mesarich

Bus

et al. 2010

Molecular Plant Pathology

159

117

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The Relationship of Genes for Pathogenicity and Certain Other Characters in Venturia Inaequalis (Cke.) Wint

Williams

Shay

1957

Genetics

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EiVTURIA inaequalis (Cke.) Wint., the ascomycetous pathogen of apple scab, Yhas been shown to have adaptations similar to the eight-spored Neurospora species for use in genetic analyses (KEITT and LANGFORD 1941;SHAY and KEITT 1945;KEITT et al. 1948;BOONE and KEITT 1956). I t has, in addition, two very important advantages over Neurospora: 1) I t is pathogenic and can be studied in vivo; and 2) it is uninucleate in its vegetative stage and, thus, is free from the confounding effects of heterocaryosis. Pathogenicity in V . iizaequalis is variable and each instance of virulence that has been studied adequately has been shown to be controlled primarily by a single gene (KEITT 1952;SHAY and HOUGH 1952; SHAY and WILLIAMS 1956). Many physiological races could be recognized on the basis of pathogenicity on apple varieties, but, so far, there has been no advantage in naming more than three (SHAY and WILLIAMS 1956). The purpose of this paper is to present the relationships of the pathogenicity genes differentiating the three recorded races of the organism. A preliminary account has been published (SHAY and WILLIAMS 1953).

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