Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Growth Competition between Trichoderma harzianum and Fusarium solani on a Plant Residue in Non-Sterile Soil

토양 식물 잔사에서 Trichoderma harzianum에 의한 식물 병원균 Fusarium solani의 성장 저해

  • Kim, Tae Gwan (Department of Microbiology, College of Natural Sciences, Pusan National University) ;
  • Knudsen, Guy R. (Soil and Land Resources Division, Department of Plant, Soil, and Entomological Sciences, University of Idaho)
  • 김태관 (부산대학교 미생물학과) ;
  • Received : 2016.08.04
  • Accepted : 2016.10.12
  • Published : 2016.12.28
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Abstract

Plant residues serve as substrates for the proliferation and overwintering of plant pathogenic fungi in soil. Effects of the biocontrol fungus Trichoderma harzianum on the colonization of wheat straw by the plant pathogenic fungus Fusarium solani were investigated under different soil moisture regimes (-50 vs. -500 kPa) in non-sterile soil. T. harzianum ThzID1-M3 and/or F. solani were added along with wheat straw to non-sterile soils. ThzID1-M3, other Trichoderma species, and F. solani were monitored for a 21-day period using quantitative PCR. ThzID1-M3 reduced the colonization of F. solani on wheat straw (p < 0.05) under both moisture regimes, and F. solani reduced the colonization by ThzID1-M3 and other Trichoderma species (p < 0.05), thus suggesting competitive inhibition between ThzID1-M3 and F. solani. Colonization by ThzID1-M3 and generic Trichoderma was improved in the wet soil (p < 0.05), but colonization by F. solani did not differ between the two moisture conditions. Thus, the inhibitory effect of ThzID1-M3 was greater in the wet soil (p < 0.05). The growth competition between ThzID1-M3 and F. solani to colonize plant debris suggests that the biocontrol fungus T. harzianum may reduce the potential of the plant pathogen, F. solani, to survive and proliferate on crops.

토양에 존재하는 식물의 잔사는 식물 병원균의 확산 및 월동을 위한 자원으로써 역할을 수행 할 수 있다. 본 연구에서는 식물 잔사인 밀짚에서 식물 병원균인 Fusarium solani의 군락 형성에 대한 생물학적 방제균인 Trichoderma harzianum의 억제 효과를 조사하였다. 두 종류의 토양 수분 조건(-50, -500 kPa)의 멸균하지 않은 토양에서 연구를 수행하였다. T. harzianum ThzID1-M3와 F. solani를 밀짚과 함께 토양에 첨가 한 후 ThzID1-M3, Trichoderma spp. 및 F. solani를 quantitative real-time PCR을 사용하여 21일 동안 관찰하였다. 모든 토양 수분 조건에서 ThzID1-M3는 F. solani의 밀짚 점유를 감소하고(p < 0.05), 반면에 F. SOLANI는 ThzID1-M3 및 Trichoderma spp.의 밀짚 점유를 감소시켰다(p < 0.05). 이 결과는 F. solani와 ThzID1-M3 사이의 경쟁적 억제를 보여주고 있다. 높은 수분 조건의 토양(-50 kPa)에서 ThzID1-M3 및 Trichoderma spp.는 더 높은 밀짚의 점유를 보여주었다(p < 0.05), 반면에 F. solani의 밀짚 점유는 두 수분조건에서 차이가 없었다. 따라서 ThzID1-M3의 병원균 억제 효과는 높은 수분 조건의 토양에서 더 컸다(p < 0.05). 토양내 식물 잔사를 점유할 때 발생되는 ThzID1-M3와 F. solani 사이의 강력한 경쟁 관계는 생물학적 방제 균인 T. harzianum가 작물 시스템에서 식물 병원균의 생존과 증식을 감소시킬 수 있음을 시사한다.

Keywords

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