The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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Influence of Soil Microbial Biomass on Growth and Biocontrol Efficac of Trichoderma harzianum

  • Bae, Yeoung-Seuk (Plant Pathology Division, National Institute of Agricultural Science and Technology) ;
  • Guy R. Kundsen (Department of Plant, Soil, and Entomological Sciences, College of Agriculture, University of Idaho, Moscow) ;
  • Louise-Marie C. Dandurand (Plant Pathology Division, National Institute of Agricultural Science and Technology, RDA, Suwon)
  • Published : 2002.02.01
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Abstract

The hyphal growth and biocontrol efficacy of Trichodemo harzianum in soil may depend on its interactions with biotic components of the soil environment. The effect of soil microbial biomass on growth and biocontrol efficacy of T. hanianum isolate ThzIDl-M3 (green fluorescent protein transformant) was investigated using artificially prepared different levels of soil microbial biomass (153,328, or 517ug biomass carbon per g of dry soil; BC). The hyphal growth of T. harzanum was significantly inhibited in the soil with 328 or 517 $\mu$g BC compared with 153 ug BC. When ThzIDl-M3 was added to the soils as an alginate pellet formulation, the recoverable population of ThzIDl-M3 varied, but the highest population occurred in 517ug BC. Addition of alginate pellets of ThzIDl-M3 to the soils (10 per 50 g) resulted in increased indigenous microbial populations (total fungi, bacterial fluorescent Pseudomonas app., and actinomycetes). Furthermore, colonizing ability of ThzIDl-M3 on sclerotia of Sclerotinia sclerotiorum was significantly reduced in the soil with high revel of BC. These results suggest that increased soil microbial biomass contributes to increased interactions between introduced T. harzianum and soil microorganisms, consequently reducing the biocontrol efficacy of 1T. harzianum.

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References

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