TITLE:
Induction of Anthracnose Disease Resistance on Chili Fruit by Treatment of Oligochitosan—Nanosilica Hybrid Material
AUTHORS:
Pham Dinh Dzung, Le Thanh Hung, Le Si Ngoc, Hoang Dac Hiet, Bui Van Le, Nguyen Tien Thang, Dang Van Phu, Nguyen Ngoc Duy, Nguyen Quoc Hien
KEYWORDS:
Oligochitosan, Nanosilica, Chili Fruit, Colletotrichum gloeosporioides, Anthracnose
JOURNAL NAME:
Agricultural Sciences,
Vol.8 No.10,
October
23,
2017
ABSTRACT:
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.