Abstract
Injection of viable Peronospora tabacina Adam sporangia into stems of tobacco plants (Nicoliana tabacum L. cv. Kentucky 14) resulted in 50- to 600-fold increases in levels of endogenous β-ionone in green, uninfected stem tissues adjacent to necrotic lesions. Administration of exogenous β-ionone via stem injection to both greenhouse- and field-grown tobacco plants resulted in changes in plant growth, morphogenesis and susceptibility to blue mold resembling those elicited by stem inoculation with viable P. tabacina sporangia. Plant height increase was accelerated by an average of 20–30%, flowering was markedly accelerated and apical dominance was weakened. Leaves of both β-ionone-treated plants and plants systemically protected against blue mold by stem infection with P. tabacina had reduced lesion development and markedly reduced sporulation after foliar challenge with P. tabacina. Plants treated with abscisic acid, on the other hand, displayed generally increased susceptibility to blue mold, stunting, and retardation of flowering.
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