Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Suppressive Effect of Bacterial Isolates from Plant Rhizosphere against Late Blight Caused by Phytophthora citrophthora on Citrus Fruits

식물근권에서 분리한 세균을 처리한 감귤열매에서 감귤 역병 억제 효과

  • Kang, So-Young (Major of Plant Resources and Environment, College of Applied Life Sciences, Jeju National University) ;
  • Jeun, Yong-Chull (Major of Plant Resources and Environment, College of Applied Life Sciences, Jeju National University)
  • 강소영 (제주대학교 생명자원과학대학 생물산업학부 식물자원환경) ;
  • 전용철 (제주대학교 생명자원과학대학 생물산업학부 식물자원환경)
  • Received : 2010.03.22
  • Published : 2010.04.01
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Abstract

Suppression effect of the 12 bacterial isolates from plant rhizosphere against late blight caused by Phytophthora citrophthora were investigated on citrus fruits. Among the bacterial isolates, THJ609-3, TRH423-3, BRH433-2, Lyso-chit and KRY505-3 presented disease suppression after wound inoculation with the fungal pathogen in vivo. The anti-fungal activity was evaluated by measuring the length of inhibition zone of the mycelium P. citrophthora adjacent to the effective bacterial isolates in which all of the 5 bacterial isolates showed antagonistic effects. However, there was no positive correlations between the efficacy of disease suppression and the antagonistic effect. On the other hand, Lyso-chit and KRY505-3 were identified as Bacillus cereus, BRH433-2 as B. circulans and TRH423-3 as Burkholderia gladioli, respectively, by analysis of rDNA sequence on the internal transcript spaces. It is suggested that the effective bacterial isolates may be useful for finding biological control agents against late blight especially on environment-friendly farm where the application of fungicide is limited.

식물근권에서 유래된 12개의 근권세균이 Phytophthora citrophthora에 의해 발생되는 감귤 역병에 대해 감귤 열매에서 병진전 억제 효과를 나타내는지 조사하였다. 조사한 근권세균 중 THJ609-3, TRH423-3, BRH433-2, Lysochit 및 KRY505-3 등에 의해 역병이 억제되는 것을 역병균의 in vivo 상처접종을 통하여 밝혀졌다. 근권세균을 P.citrophthora의 균사체와 대치 배양하여 역병균 저지대의 길이를 측정한 결과 역병 진전억제효과를 보였던 5개의 균주에서 모두 항진균활성이 나타났다. 그러나 근권세균의 균사생장억제효과와 역병억제효과 사이에 양의 상관관계는 성립되지는 않았다. 한편, 근권세균 rDNA의 internal transcript spaces(ITS)을 분석을 통해 동정 한 결과 Lysochit과 KRY505-3은 Bacillus cereus로 동정 되었고, BRH4332은 B. circulans로, TRH423-3는 Burkholderia gladiol로 동정되었다. 이 연구는 친환경 농가와 같이 농약사용이 제한된 농장에서 감귤 역병에 대해 생물적 방제를 위한 활성균을 모색하는데 매우 가치가 있을 것으로 생각된다.

Keywords

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