Induction of Systemic Acquired Resistance in Pepper Plants by Acibenzolar-S-methyl against Bacterial Spot Disease |
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Authors: | Roberto Buonaurio Luciano Scarponi Mery Ferrara Paola Sidoti Angelo Bertona |
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Institution: | (1) Dipartimento di Arboricoltura e Protezione delle Piante, Università degli Studi di Perugia, Borgo XX Giugno, 74, 06121 Perugia, Italy;(2) Centro di Studio sulla Chimica e Biochimica dei Fitofarmaci del CNR — Borgo XX Giugno, 72-06121 Perugia, Italy;(3) Syngenta Protezione Piante S.p.A., Via S. Sofia, 21, 20122 Milano, Italy |
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Abstract: | The ability of acibenzolar-S-methyl to induce resistance in pepper plants against Xanthomonas campestris pv. vesicatoria was investigated in both growth chamber and open field conditions. Growth chamber experiments showed that acibenzolar-S-methyl (300M) treatment protects pepper plants systemically and locally against X. campestris pv. vesicatoria. Evidence for this was a reduction in the number and diameter of bacterial spots and bacterial growth in planta. Systemic protection was also exerted by the acibenzolar-S-methyl acid derivative, CGA 210007, which may be produced by hydrolysis in the plant. The efficacy of acibenzolar-S-methyl was also found in open field conditions, where both leaves and fruit were protected from the disease. The highest efficacy (about 67%) was obtained by spraying the plants 6–7 times every 8–12 days with a mixture of acibenzolar-S-methyl and copper hydroxide (2.5 + 40ghl–1 active ingredient). Persistence and translocation data obtained from the growth chamber experiments revealed a persistence of acibenzolar-S-methyl lasting five days after treatment with rapid translocation and negligible levels of acid derivative formation. Since the protection exerted by acibenzolar-S-methyl against bacterial spot disease was observed when the inducer was completely degraded, it would appear to be due to SAR activation. |
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Keywords: | acibenzolar-S-methyl Capsicum annuum persistence systemic acquired resistance translocation Xanthomonas campestris pv vesicatoria |
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