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유용 Pseudomonas 종의 근면점유와 무우 Fusarium시들음병의 억제에 관한 생물학적 정량

Root Colonization by Beneficial Pseudomonas spp. and Bioassay of Suppression of Fusarium Wilt of Radish

초록

무우품종(Raphanus sativus L.) Saxa Nova에 시들음병을 일으키는 Fusarium oxysporum f. sp. raphani (FOR)에 대해 저항성을 증가시켜 방제효과를 얻기 위하여 식물성장을 증진시키는 것으로 알려진 Pseudomonas florescens WCS374 (WCS 374), P. putida RE10 (RE10) 및 Pseudomonas sp. EN41S (EN415)을 병원균처리 토양에 단독 또는 혼합처리하여 4주간 폿트배양한 후 무우에 나타나는 외부 및 내부병징을 조사하여 처리세균에 의한 병억제 효과를 측정하였다. 내부 및 외부병징으로 대조구는 각각 46.5% 및 21.1%를 나타내었고, RE10처리는 내외병징이 각각 12.2%와 7.8%로 발병이 억제됨을 알 수 있었다. 그러나 발병억제력이 높다고 알려진 WCS374는 내외 병징이 각각 45.6%와 27.8%로 나타났다. 한편 RE10균주를 WCS374 또는 EN415 균주와 혼합하여 처리할 경우 내외 병징이 10.0-22.1% 정도이었고 EN415와 혼합처리하면 7.8-20.2%의 병징을 나타낸다. FOR의 뿌리점유율은 뿌리에서 $2.4-5.1{\times}10^3/g$였고 토양내 분포수는 $0.7-1.3{\times}10^3/g$이었다. 대조구는 뿌리에서 $3.8{\times}10^3/g$였으며 RE10의 처리는 $2.9{\times}10^3/g$로 분포수가 적었고, 3종 세균의 혼합처리는 $5.1{\times}10^3/g$으로 많이 관찰되었으나, 처리간에 통계적 차이는 없었다. 토양에서 관찰된 FOR은 부리부분 보다 그 분포 수가 적었다. 처리된 3가지 세균은 뿌리에서 $2.3-4.0{\times}10^7/g$ 범위이고, 토양에서는 $0.9-1.8{\times}10^7/g$으로 뿌리에서 관찰된 수 보다 적게 분포하였다. 뿌리부분에서 대조구나 RE10의 처리토양은 형광성 Pseudomonas spp.의 분포수가 적고 처리간에는 통계적 차이를 나타냈으나, 토양조사에서 이세균은 큰 차이를 나타내지 않았다. 뿌리에 처리된 세균과 FOR의 분포수는 토양에 처리된 것과 대조하였을 때 많았으며, 이 실험 에 사용된 RE10과 EN415은 Fusarium시들음병에 대한 기주의 저항성을 유도하는 것으로 생각된다.

Abstract

Fusarium wilt of radish (Raphanus sativus L.) is caused by the Fusarium oxysporum f. sp. raphani (FOR) which mainly attacks Raphanus spp. The pathogen is a soil-borne and forms chlamydospores in infected plant residues in soil. Infected pathogen colonizes the vascular tissue, leading to necrosis of the vascular tissue. Growth promoting beneficial organisms such as Pseudomonas fluorescens WCS374 (strain WCS374), P. putida RE10 (strain RE10) and Pseudomonas sp. EN415 (strain EN415) were used for microorganisms-mediated induction of systemic resistance in radish against Fusarium wilt. In this bioassy, the pathogens and bacteria were treated into soil separately or concurrently, and mixed the bacteria with the different level of combination. Significant suppression of the disease by bacterial treatments was generally observed in pot bioassy. The disease incidence of the control recorded 46.5% in the internal observation and 21.1% in the external observation, respectively. The disease incidence of P. putida RE10 recorded 12.2% in the internal observation and 7.8% in the external observation, respectively. However, the disease incidence of P. fluorescens WCS374 which was proved to be highly suppressive to Fusarium wilt indicated 45.6% in the internal observation and 27.8% in the external observation, respectively. The disease incidence of P. putida RE10 mixed with P. fluorescens WCS374 or Pseudomonas sp. EN415 was in the range of 10.0-22.1%. On the other hand, the disease incidence of P. putida RE10 mixed with Pseudomonas sp. EN415 was in the range of 7.8-20.2%. The colonization by FOR was observed in the range of $2.4-5.1{\times}10^3/g$ on the root surface and $0.7-1.3{\times}10^3/g$ in the soil, but the numbers were not statistically different. As compared with $3.8{\times}10^3/g$ root of the control, the colonization of infested ROR indicated $2.9{\times}10^3/g$ root in separate treatments of P. putida RE10, and less than $3.8{\times}10^3/g$ root of the control. Also, the colonization of FOR recorded $5.1{\times}10^3/g$ root in mixed treatments of 3 bacterial strains such as P. putida RE10, P. fluorescens WCS374 and Pseudomonas sp. EN415. The colonization of FOR in soil was less than that of FOR in root part. Based on soil or root part, the colonization of ROR didn't indicate a significant difference. The colonization of introduced 3 fluorescent pseudomonads was observed in the range of $2.3-4.0{\times}10^7/g$ in the root surface and $0.9-1.8{\times}10^7/g$ in soil, but the bacterial densities were significantly different. When growth promoting organisms were introduced into the soil, the population of Pseudomonas sp. in the root part treated with P. putida RE10 was similar in number to the control and recorded the low numerical value as compared with any other treatments. The population density of Pseudomonas sp. in the treatment of P. putida RE10 indicated significant differences in the root part, but didn't show significant differences in soil. The population densities of infested FOR and introduced bacteria on the root were high in contrast to those of soil. P. putida RE10 and Pseudomonas sp. EN415 used in this experiment appeared to induce the resistance of the host against Fusarium wilt.

저자의 다른 논문

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이 논문을 인용한 문헌 (4)

  1. Woo, Sang-Min ; Woo, Jae-Uk ; Kim, Sang-Dal 2007. "Purification and Characterization of the Siderophore from Bacillus licheniformis K11, a Multi-functional Plant Growth Promoting Rhizobacterium." 한국미생물·생명공학회지 = Korean journal of microbiology and biotechnology, 35(2): 128~134 
  2. Woo, Sang-Min ; Kim, Sang-Dal 2008. "Structural Identification of $Siderophore_{AH18}$ from Bacillus subtilis AH18, a Biocontrol agent of Phytophthora Blight Disease in Red-pepper" 한국미생물·생명공학회지 = Korean journal of microbiology and biotechnology, 36(4): 326~335 
  3. Kim, Young-Sook ; Lee, Myeong-Seok ; Yeom, Ji-Hee ; Song, Ja-Gyeong ; Lee, In-Kyoung ; Yun, Bong-Sik 2011. "Screening of Multifunctional Bacteria with Biocontrol and Biofertilizing Effects" 한국균학회지 = The Korean journal of mycology, 39(2): 126~130 
  4. Kim, Young-Sook ; Lee, Myeong-Seok ; Yeom, Ji-Hee ; Song, Ja-Gyeong ; Lee, In-Kyoung ; Yeo, Woon-Hyung ; Yun, Bong-Sik 2012. "Screening of Antagonistic Bacteria for Biological control of Ginseng Root Rot" 한국균학회지 = The Korean journal of mycology, 40(1): 44~48 

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