Mode of dispersal and variation in population of white root fungus Rigidoporus microporus as revealed by mycelial incompatibility

Suwandi, Suwandi (2007) Mode of dispersal and variation in population of white root fungus Rigidoporus microporus as revealed by mycelial incompatibility. In: Proceedings of International Workshop on White Root Disease Hevea Rubber. Indonesian Rubber Research Institute, Salatiga, Indonesia, pp. 68-75. ISBN 978-979-25-3284-5

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      Abstract

      Management of the white root disease in Indonesia and other tropical regions has been developed without any knowledge of population of the causal fungus. We determined 33 mycelial compatibility groups (MCGs) out of 62 isolates collected from 11 plant species in South Sumatra and Bangka Island. Mycelial incompatibility in R. microporus is characterized by formation of demarcation line and/or sparse aerial mycelial growth along the zone of interaction of genetically different mycelia. Failure to anastomosis between incompatible mycelia induced abnormal, spiral-like of hyphal growth. Most of isolates colonizing the stumps were somatically compatible with isolates from either a nearby stump or living trees, which suggested the evidence of stump-to-tree or stump-to-stump clonal growth of the fungus. Each study site was occupied by at least one MCG which indicated that local population of R. microporus consists of different genotypes (genetic individual) which spread clonally to form patches of mycelial networks. A territorial clone covered large area (up to 52 m across) that encompassed both old trees (Hevea brasiliensis, Artocarpus integra and Arenga pinata) and recent non-woody plants (Languas galangal and Musa paradisiaca). All of isolates occurring on different location have different MCG. This indicated that no evidence of clonal (vegetative) spread between separate locations. Most of isolates of R. microporus were strongly pathogenic on rubber seedlings. These isolates belonged to different MCG and showed strongly laccase activity as compared to the less pathogenic isolates.

      Item Type: Book Section
      Subjects: S Agriculture > SB Plant culture
      Divisions: Faculty of Agriculture > Department of Plant Pests and Diseases
      Depositing User: Dr. Suwandi
      Date Deposited: 13 Feb 2012 08:52
      Last Modified: 05 Mar 2012 03:14
      URI: http://eprints.unsri.ac.id/id/eprint/422

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