Article

[Diversity of actinomycetes associated with root-knot nematode and their potential for nematode control].

Institute of Microbiology, Chinese Academy of Sciences, Beijing 100080, China.
ACTA MICROBIOLOGICA SINICA 09/2006; 46(4):598-601. pp.598-601
Source: PubMed

ABSTRACT Twenty actinomycetes were isolated from root-knot nematode eggs and females collected from 11 plant root samples infested by Meloidogyne spp.. The isolates were assigned to the genera Streptomyces, Nocardia and Pseudonocardia respectively, based on analysis of morphological characteristics, cell-wall DAPs and 16S rRNA gene sequences. 80% of them were streptomycetes. Biocontrol potential of the isolates against Meloidogyne hapla was evaluated in liquid culture in vitro. The average percentages of egg parasitism, egg hatching, and juvenile mortality were 54.1, 40.4 and 26.2, respectively. Three Streptomyces strains and one Nocardia strain with high pathogenicity in vitro were selected to determine their ability to reduce tomato root galls in greenhouse. The results demonstrated good biocontrol efficacy (31.4%-56.4%) of the strains.

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Keywords

16S rRNA gene sequences
 
average percentages
 
cell-wall DAPs
 
galls
 
genera Streptomyces
 
juvenile mortality
 
liquid culture
 
morphological characteristics
 
Nocardia
 
Nocardia strain
 
Pseudonocardia
 
root-knot nematode eggs
 
samples
 
strains
 
Streptomyces strains
 

Hong-Li Luo