Abstract
Pretreatment of Nicotiana tabacum with acetylsalicylic acid and β-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. β-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 β-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 β-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 β-ionone and acetylsalicylic acid suggest different modes of action.
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Dennis, J.J.C., Guest, D.I. Acetylsalicylic acid and β-ionone decrease the susceptibility of tobacco to tobacco necrosis virus and Phytophthora parasitica var. nicotianae . Australasian Plant Pathology 24, 57–64 (1995). https://doi.org/10.1071/APP9950057
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DOI: https://doi.org/10.1071/APP9950057