Abstract

Different concentrations of the systemic acquired resistance (SAR) elicitors, salicylic acid (SA), methylsalicylicacid (MetSA), acibenzolar-S-methyl (ASM) and 2,6-dicholoroisonicotinic acid (INA), wereprovided to tomato seedlings as root-dip or soil-drench one day before inoculation with the root-knotnematode, Meloidogyne incognita. Nematode infestation was evaluated by counting egg masses/plant(EM), eggs/plant (Pf), and sedentary forms/plant (SF) in treated and untreated plants seven weeks afterinoculation. An index of plant fitness (PF) was also calculated to assess the costs of chemically-inducedresistance and the possible phytotoxicity of the treatments. SA and ASM were found to be effectiveelicitors of resistance when applied at suitable concentrations and method of application. Soil-drenchwith SA and root-dip in ASM were the most effective treatments as they markedly reduced bothnematode reproduction (less than 50% that of untreated plants) and infestation (50e70% EM reduction).MetSA was less effective than SA in eliciting resistance because of its negative effects on plant fitnesswhen it was provided as soil-drench. INA did not reduce nematode infestation at any of the nonphytotoxicrates. The reduction of nematode infestation and reproduction by SA applied as soil-drenchwas potentiated when the soil was enriched with humic acids. Soil-drenching with SA and MetSA werethe only treatments that caused a long-lasting induction of plant defences as they inhibited the infestationby the second generation of the nematode.

Autore Pugliese

• Molinari Sergio

Tutti gli autori

• Molinari S. ; Baser N.

Titolo volume/Rivista

Crop protection

Anno di pubblicazione

2010

ISSN

0261-2194

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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