The antimicrobial activity of King of Bitters, Andrographis paniculata (Burm f.) wall. ex Nees.

Date

12-2011

Degree

Bachelor of Science in Agriculture

Major Course

Major in Plant Pathology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Orajay, Joey I.

Abstract

Aqueous extract of Andrographis paniculata, an herbaceous plant used in traditional Chinese, Thai and Indian medicine, was investigated for its antimicrobial activity against 15 plant pathogenic fungi (Bipolaris maydis, Colletotrichum gloeosporioides, Alternaria alternata, Curvularia inequalis, Aspergillus oryzae, A. niger, A. flavus, Fusarium oxysporum, Rhizoctonia solani, Rhizopus stolonifer, Sclerotium rolfsii, Lasiodiplodia theobromae, Thielaviopsis sp., Penicillium sp., and Phomopsis vexan) and three plant pathogenic bacteria (Xanthomonas oryzae pv. oryzae, Pectobacterium carotovorum and Ralstonia solanacearum). Results showed that the aqueous extract did not inhibit growth of any of the pathogens tested on agar media as no zone of inhibition was observed. However, significant reduction in spore germination of three fungal pathogens (B. maydis, C. gloeosporioides and C. inequalis) was observed when treated with the plant extract for 4 days. Based on these results, it can be concluded that the crude extract of A. paniculata may inhibit spore germination of certain plant pathogens, and therefore, warrants further investigation.

Language

English

Location

UPLB Main Library Special Collections Section

Call Number

Thesis

Document Type

Thesis

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