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Abstract
The effects of salicylic acid (SA) at three concentrations i.e. 2.5, 5 and 7 mM and plant extracts from pick tooth (Ammi visnaga), liquorice (Glycyrrhiza glabra), artemisia (Artemisia judaica), mint (Mentha viridis), clove (Syzygium aromaticum) and blue gum (Eucalyptus globulus) on the infection of rice kernel smut disease caused by Tilletia barclayana were studied. Spraying of rice plants with different concentrations of SA at seven days before infection was the most effective treatment against pathogen infection. Among all plant extract treatments, M. viridis and S. aromaticum were the most effective treatments. Additionally, our results showed increased levels of peroxidase, polyphenol oxidase, phenylalanine ammonia lyase and chitinase as well as total protein contents in the treated plants compared with the control. In conclusion, accumulations of these oxidative enzymes in plants treated with SA and plant extracts provide their role in the activation of induced resistance against T. barclayana.
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