Phytopathology (1996) 86, p. S5 (Jacobson et al.)

D.J. Jacobson, S.M. LeFebvre, R.S. Ojerio and E. Heikkinen (1996)
Evidence of systemic, asymptomatic infection of Albugo candida in three wild crucifer species
Phytopathology 86 (11 suppl.), S5-S5
Abstract: Field observations and published data suggested that the pathogen, Albugo candida (Ac), could exist as latent, asymptomatic systemic infections in the host. The wild species Lepidium campestre, Arabis lyrata, and Erysimum menziesii ssp. eurekense were chosen as models to test this hypothesis. Detection of the pathogen in asymptomatic host tissue was based on nested PCR amplification of ribosomal DNA internal transcribed spacer region I of Ac using primers designed to discriminate between plant and pathogen template. Asymptomatic mature field grown plants, greenhouse grown vegetative rosettes, and laboratory germinated seed of all species showed the presence of Ac in high proportions, up to 100%. For example, Ac appeared to be systemic in all 20 field plants and 10 inoculated rosettes of L. campestre. Uninoculated rosettes and seedlings showed presence of Ac suggesting seed bome transmission of the pathogen. Although the parameters affecting symptom development are still unknown, presence of the pathogen appears not to be sufficient for symptom expression.

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Albugo candida