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Induction of resistance to downy mildew (Peronospora parasitica) in cauliflower by DL-β-amino-n-butanoic acid (BABA)
Article first published online: 6 FEB 2002
Volume 51, Issue 1, pages 97–102, February 2002
How to Cite
Silué, D., Pajot, E. and Cohen, Y. (2002), Induction of resistance to downy mildew (Peronospora parasitica) in cauliflower by DL-β-amino-n-butanoic acid (BABA). Plant Pathology, 51: 97–102. doi: 10.1046/j.1365-3059.2002.00649.x
- Issue published online: 6 FEB 2002
- Article first published online: 6 FEB 2002
- Accepted 6 August 2001
- induced local and systemic resistance;
- pathogenesis-related (PR) proteins, priming
Of the three isomers of aminobutyric acid, only the β isomer (BABA) was effective in inducing resistance against Peronospora parasitica, the causal agent of downy mildew, in cauliflower (Brassica oleracea var. botrytis). A single foliar spray applied to 7-day-old seedlings protected the plants against Peronospora parasitica for at least 15 days. Of the enantiomers (R and S), only the R was effective. Resistance was accompanied by a hypersensitive-like reaction (necrotic spots) which was evident before inoculation. BABA was systemically effective when applied to the roots, but failed to protect cotyledons adjacent to treated ones. Unlike other chemical inducers, BABA was effective when applied several hours postinoculation. It had no effect on P. parasitica spore germination. In cauliflower seedlings, BABA did not induce the accumulation of the pathogenesis-related protein PR-1, PR-2, PR-3, PR-5 and PR-9. Only treated and challenged seedlings accumulated PR-2.