Induction of Anthracnose Disease Resistance on Chili Fruit by Treatment of Oligochitosan—Nanosilica Hybrid Material

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Oligochitosan (OC) with molecular weight Mw of 5000 g/mol was prepared by gamma Co-60 ray irradiation of chitosan solution. Nanosilica (nSiO2 ) with the size of 10 - 30 nm was synthesized by calcination of acid treated rice husk. The mixture of 1% OC - 1% nSiO2  was prepared by dispersion of nSiO2  in OC solution. The morphology of nSiO2  in the mixture of OC-nSiO2  was measured from images of transmission electron microscopy (TEM). The effect of foliar application of the mixture of OC-nSiO2 on the induction of resistance against anthracnose disease caused by Colletotrichum gloeosporioides fungus on chili fruits was investigated. Results indicated that foliar application of OC-nSiO2  with the concentration of 60 mg/l - 60 mg/l was found to be as the optimal treatment that reduced the disease severity on chili fruits to 22.2% compared with 90.0% of the control. Thus, OC-nSiO2  hybrid material could be considered as an effective biotic elicitor to prevent anthracnose disease infection for chili fruits. Furthermore, the prepared OC-nSiO2  hybrid material can also be used as an environmentally friendly agrochemical product for sustainable development of agriculture.

Authors: 
Pham Dinh Dzung
Authors: 
Le Thanh Hung
Authors: 
Le Si Ngoc
Authors: 
Hoang Dac Hiet
Authors: 
Bui Van Le
Authors: 
Nguyen Tien Thang
Authors: 
Dang Van Phu
Authors: 
Nguyen Ngoc Duy
Authors: 
Nguyen Quoc Hien
Publisher: 
Agricultural Sciences
Year: 
2,017