The Korean Journal of Pesticide Science (농약과학회지)

The Korean Society of Pesticide Science (한국농약과학회)
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Rice Plant Growth Promotion and Induced Systemic Resistance Against Rice strip tenuivirus by a Selected PGPR, Bacillus amyloliquefaciens

PGPR균 EXTN-1 처리에 의한 벼의 생육촉진 및 벼줄무늬잎마름병(RSV)에 대한 유도저항성 발현

  • Park, Jin-Woo (Applied Microbiology Laboratory, Agricultural Microbiology Team, NAAS, RDA) ;
  • Park, Kyung-Seok (Applied Microbiology Laboratory, Agricultural Microbiology Team, NAAS, RDA) ;
  • Lee, Key-Woon (Applied Biology and Chemistry Division, Kyungpook National University)
  • 박진우 (농촌진흥청 국립농업과학원 농업미생물팀) ;
  • 박경석 (농촌진흥청 국립농업과학원 농업미생물팀) ;
  • 이기운 (경북대학교 응용생명과학부)
  • Received : 2011.12.01
  • Accepted : 2011.12.19
  • Published : 2011.12.31
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Abstract

In previous reports, the treatment of Bacillus amyloliquefaciens strain EXTN-1 showed a broad diseasecontrolling spectrum to the plant diseases caused by viral, bacterial, and fungal pathogens as well as the promotion of plant growth. In mechanisms of EXTN-1, treatment of EXTN-1 increased oxidative burst in early stage and induced the expression of resistance genes, PR-1a, PDF1.2. Mechanism involved in induced systemic resistance by EXTN-1 was revealed as simultaneous activation of SA and JA or ethylene metabolic pathways. The purpose of this study was to determine whether B. amyloliquefaciens EXTN-1 has a similar effect on rice plant against Rice stripe tenuivirus (RSV) under greenhouse conditions. When rice seeds were soaked in B. amyloliquefaciens strain EXTN-1, rice plants showed significant systemic resistance against RSV as well as promoted growth. In the case of plant growth, in 30-day old plants treated with B. amyloliquefaciens EXTN-1, the heights, weights, and lengths of roots increased by 12.6%, 9.8%, and 16.0%, respectively confirming the effects of PGPR. When the induced systemic resistance to RSV was examined, in 20-day old plants were treated with B. amyloliquefaciens EXTN-1, the heights, weights, and lengths of roots increased by 8.4%, 10.9%, and 4.8%, respectively compared to the control. Induced systemic resistance was more prominent in susceptible cultivars - Chucheong and Ilpum compared to the resistant cultivar, Nakdong.

Bacillus amyloliquefaciens strain EXTN-1 처리에 의해 생육촉진 효과와 함께 광범위한 식물 병 방제효과가 보고되었다. EXTN-1의 PGPR 효과는 생육초기에 PR-1a, PDF1.2 등의 저항성 관련 유전자 발현에 의한 oxidative burst의 증가나 SA, JA나 ethylene 대사에 의한 유도저항성의 발현에 기인한다. 이 연구의 목표는 B. amyloliquefaciens EXTN-1가 기존에 보고된 다른 작물의 경우에서와 마찬가지로 벼의 생육촉진이나 벼줄무늬잎마름병에 대한 저항성에 관여하는지를 확인하기 위해 수행되었다. 벼 종자를 B. amyloliquefaciens EXTN-1에 침지한 후 파종하였을 때 생육촉진 효과와 병에 대한 저항성 발현이 확인되었다. B. amyloliquefaciens EXTN-1을 처리한 30일묘에서 벼의 초장, 생물중, 뿌리길이는 무처리구에 비해 각각 12.6%, 9.8%, 16.0% 증가하여 PGPR 효과가 나타남을 확인할 수 있었다. RSV 접종구에서도 B. amyloliquefaciens EXTN-1 20일묘는 초장, 생물중, 뿌리길이는 무처리구에 비해 각각 12.6%, 9.8%, 16.0% 증가하였다. 유도저항성 발현효과는 감수성 품종에서 저항성 품종에서 상대적으로 뚜렷하게 나타났다.

Keywords

References

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