Induce Onion Plants Resistance Against Sclerotium cepivorum Berk. Mediated Through Salicylic Acid and Sil-Matrix 29% SL.

Document Type : Original Article

Authors

1 Plant Pathol. Res. Inst., ARC, Giza, Egypt.

2 Plant Pathol. Dept. Fac. of Agri., Ain Shams University, Cairo, Egypt.

Abstract

Salicylic acid (SA) and Sil-Matrix 29% SL (SM) (potassium silicate, potassium salt of silicic acid) were used to manage white rot of onion caused by Sclerotium cepivorum Berk. at the rate of 1, 2 and 3mM of SA and 1.5, 3 and 6ml/L of SM as transplants dipping followed by foliar spray by the same concentrations at 6 and 12 weeks from transplanting under greenhouse and open field conditions. The fungicide folicure 25% EC (Tebuconazole 25%) was used as comparison. All treatments reduced white rot infection compared with non-treated plants either in greenhouse or field. SA at the rate of 3mM gave the best reduction where it gave 35.0% and 26.0% infection under greenhouse and field respectively. The best treatment of SM was 6ml/L which gave 45% and 38.2% infection under greenhouse and field respectively. Compared to non-treated plants, all treatments increased onion yield, bulb weight, and plants height. SA at the rate of 3mM gave 144.3% and 160.4% increase in yield and bulb weight respectively, while SM at the rate of 6ml/L gave 24% as best increase in plants height. Soluble protein, free amino acids, reducing sugars, phenolic compounds, peroxidase and polyphenol oxidase activity increased after dipping while it varied after spraying.      

Keywords

Journal of Plant Protection and Pathology
Volume 7, Issue 11
November 2016
Pages 707-715

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