Australasian Plant Pathology (1995) 24, 57-64

J.J.C. Dennis and D.I. Guest (1995)
Acetylsalicylic-acid and beta-ionone decrease the susceptibility of tobacco to tobacco necrosis virus and Phytophthora parasitica var nicotianae
Australasian Plant Pathology 24 (1), 57-64
Abstract: Pretreatment of Nicotiana tabacum with acetylsalicylic acid and beta-ionone reduced the severity of symptoms caused by the black shank pathogen, Phytophthora parasitica var. nicotianae, and tobacco necrosis virus (TNV). Acetylsalicylic acid applied as root drenches or leaf injections (1.1 mM) reduced symptom severity following challenge with either pathogen, but foliar sprays were ineffective. beta-ionone was most effective when applied neat as leaf injections or as drops to leaf axils at least 2 weeks before challenge. Phloem injections were no more effective than control injections with water, but induced localised wounding, an increase in the number of leaves, and precocious flowering. Root drenches of 2 mM beta-ionone significantly reduced the number and size of lesions induced by TNV, but were no more effective against P. parasitica var. nicotianae than control drenches of Tween 20. Both beta-ionone and acetylsalicylic acid inhibit the growth in vitro of P. parasitica var. nicotianae at the concentrations used. Differences in the characteristics and persistence of the protection afforded by beta-ionone and acetylsalicylic acid suggest different modes of action.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): David I. Guest

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Alphanecrovirus nicotianae	Tobacco (Nicotiana tabacum)
	Phytophthora nicotianae	Tobacco (Nicotiana tabacum)