Table of Contents
International Scholarly Research Notices
Volume 2014, Article ID 925131, 7 pages
http://dx.doi.org/10.1155/2014/925131
Research Article

L-Asparaginase Activity of Fungal Endophytes from Tabernaemontana heyneana Wall. (Apocynaceae), Endemic to the Western Ghats (India)

Department of Studies in Botany, University of Mysore, Manasagangotri, Mysore, Karnataka 570 006, India

Received 11 July 2014; Accepted 25 November 2014; Published 14 December 2014

Academic Editor: Rajesh Jeewon

Copyright © 2014 Chandramouli Manasa and Monnanda Somaiah Nalini. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

“Endophytes,” the microbes residing within the plant tissues, are important sources of secondary metabolites. Tabernaemontana heyneana Wall., a medicinal tree, endemic to the Western Ghats with rich ethnobotanical history and unique chemical diversity, was selected to study fungal endophytes and evaluate them for L-asparaginase activity. Healthy plant parts were selected for the isolation of endophytes following standard isolation protocols. A total of 727 isolates belonging to 20 taxa were obtained. The isolates comprised of bark (11%), twig (22%), leaf (43%), fruit (12.0%), and seeds (12%). Endophytes such as Colletotrichum, Curvularia, Fusarium, Phomopsis, Verticillium, and Volutella colonized T. heyneana plant parts. Fusarium sp., Phomopsis spp., isolate Thlf01, and Fusarium solani were the dominant genera of bark, twig, leaf, fruits, and seed samples, respectively. The endophytes were screened for their ability to utilize L-asparagine by plate assay method. Fusarium spp. exhibited a high level of activity among the nine endophytes tested positive for L-asparaginase activity. Studies underline the potentials of endophyte-derived fungal L-asparaginases as sources of chemotherapeutic agents.