Study on the diversity of endophytic communities from rice ( Oryza sativa L.) and their antagonistic activities in vitro

Endophytic populations were isolated from 2400 segments of Oryza sativa collected from Bhadra River Project Area, Southern India during December 2005 (Winter) and April 2006 (Summer). Overall colonization rates from surface sterilized tissues were 40.3% in roots and 25.83% in leaves during winter se...

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Bibliographic Details
Published in:Microbiological research 2009, Vol.164 (3), p.290-296
Main Authors: Naik, B. Shankar, Shashikala, J., Krishnamurthy, Y.L.
Format: Article
Language:English
Subjects:
Antagonism
Antibiosis
Bacteria - classification
Bacteria - isolation & purification
Bacterial Physiological Phenomena
Biodiversity
Chaetomium globosum
Cladosporium cladosporioides
Diversity
Dual culture
Endophytes
Freshwater
Fungi - classification
Fungi - isolation & purification
Fungi - physiology
Fusarium oxysporum
India
Oryza - microbiology
Oryza sativa
Penicillium chrysogenum
Plant Leaves - microbiology
Plant Roots - microbiology
Rice
Streptomyces
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Summary:Endophytic populations were isolated from 2400 segments of Oryza sativa collected from Bhadra River Project Area, Southern India during December 2005 (Winter) and April 2006 (Summer). Overall colonization rates from surface sterilized tissues were 40.3% in roots and 25.83% in leaves during winter season, 20.15% in roots and 8.66% in leaves during summer season. Nineteen different fungal taxa, a Streptomyces sp. and bacterial species were isolated. Streptomyces sp., Chaetomium globosum, Penicillium chrysogenum, Fusarium oxysporum and Cladosporium cladosporioides were dominant endophytes in this study. Frequency of colonization between the sites, seasons and rice varieties were found to differ significantly. Dual culture studies revealed that C. globosum, P. chrysogenum and Streptomyces sp. are suitable candidates for extraction of biologically active compounds. Rice harbors many endophytic organisms and some of them have antagonistic properties against fungal pathogens.
ISSN:0944-5013
1618-0623
DOI:10.1016/j.micres.2006.12.003