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Summary of Biotechnology doctoral thesis: Study to produce oligochitosan-silica nano and investigate the induced systemic resistance against anthracnose disease caused by Colletotrichum spp. on hot chilli (Capsicum frutescens L.)

The objectives of the thesis: Identify the pathogenicity potential and classificate at species level of Colletotrichum spp. isolated from hot chilli in Vietnam; produce stable oligochitosan-silica nano, which potentially highly induced effectively the systemic resistance against anthranose disease on hot chilli, based on the combination of low molecular weight chitosan with nano silica. | MINISTRY OF VIETNAM ACADEMY EDUCATION AND OF SCIENCE AND TRAINING TECHNOLOGY GRADUATE UNIVERSITY SCIENCE AND TECHNOLOGY ---------------------------- PHAM DINH DUNG Study to produce oligochitosan-silica nano and investigate the induced systemic resistance against anthracnose disease caused by Colletotrichum spp. on hot chilli Capsicum frutescens L. Major Biotechnology Code 9 42 02 01 SUMMARY OF BIOTECHNOLOGY DOCTORAL THESIS Ho Chi Minh City 2020 The thesis was completed at Graduate University of Science and Technology - Vietnam Academy of Science and Technology Supervisor 1 Assoc. Prof. Dr. NGUYEN TIEN THANG Supervisor 2 Assoc. Prof. Dr. BUI VAN LE Reviewer 1 Reviewer 2 Reviewer 3 The thesis shall be defended in front of the Thesis Committee at Academy Level at Graduate University of Science and Technology - Vietnam Academy of Science and Technology At. hour. date. month. year 20. The thesis can be found at - The National Library - The Library of Graduate University of Science and Technology 1 INTRODUCTION 1. The necessity of the thesis Hot chili Capsicum sp. is a spice plant grown in the tropics and consumed around the world due to its high economic value. However diseases caused by fungi viruses and bacteria are the major constraints to hot chili production. Among the diseases on hot chilli pathogenic fungus is one of the main reasons cause of loss 10-80 hot chilli production in Vietnam India Thailand Korea Common diseases on hot chili are caused by Rhizoctonia solani Colletotrichum spp. Botrytis cinerea Fusarium oxysporum Phythopthora capsica anthracnose disease caused by Colletotrichum spp. is one the most destructive diseases restricting hot chili production. Colletotrichum spp. mainly causes anthracnose disease in hot chili. This fungus damages on branches leaves flowers and fruits. The symptoms of anthracnose are circular or angular sunken lesions on hot chili fruits and shaped brown spots with dark brown edges on leaves with concentric rings of acervuli. .