Please use this identifier to cite or link to this item:
Title: Actinomycetes and fungi isolated from plant-parasitic nematode infested soils: Screening of the effective biocontrol potential, indole-3-acetic acid and siderophore production
Authors: Pornthip Ruanpanun
Nuchanart Tangchitsomkid
Kevin D. Hyde
Saisamorn Lumyong
Keywords: Biochemistry, Genetics and Molecular Biology
Immunology and Microbiology
Issue Date: 11-Feb-2010
Abstract: Root-knot nematodes are serious pathogens that severe damage to major crops. They damage plant root system that caused significant yield losses. Moreover, the predisposition of nematode-infected plants is secondary infection from fungal plant pathogen that additional adverse effects on plant growth. Our target is to find the antagonist for control nematode, and secondary infection agents and stimulate plant growth. Twenty-three plant-parasitic nematode infested soils were taken from some provinces in the northern and center of Thailand and actinomycetes and fungi were isolated. Eighty-three isolates belong to actinomycete and 67 isolates were fungi. The predominant actinomycete taxa was Streptomyces (97.6%). The predominant fungal taxa were Penicillium (37.3%) and Fusarium (32.8%). All actinomycete and fungal isolates were subjected for primary screening in vitro for their effects on egg hatching and juvenile mortality of Meloidogyne incognita. Secondary screening was evaluated for antagonist effect on plant pathogenic fungi collected from nematode-infected plant, plant growth hormone (indole-3-acetic acid; IAA) and siderophore production. From primary screening, 7 actinomycete and 10 fungal isolates reduced egg hatching and kill juveniles of M. incognita after 7 days incubation. In secondary screening, 10 nematophagous microbes produced IAA and 9 isolates produced hydroxamate siderophore. Streptomyces sp. CMU-MH021 was selected as a potential biocontrol agent. It reduced egg hatching rate to 33.1% and increased juvenile mortality rate to 82% as contrasted to the control of 79.6 and 3.6%, respectively. This strain had high activity to against tested fungi and high ability on IAA (28.5 μg ml-1) and siderophore (26.0 μg ml-1) production. © 2010 Springer Science+Business Media B.V.
ISSN: 09593993
Appears in Collections:CMUL: Journal Articles

Files in This Item:
There are no files associated with this item.

Items in CMUIR are protected by copyright, with all rights reserved, unless otherwise indicated.