Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Plant Growth Promotion Activity of Endophytic Fungi Isolated from the Roots of Calystegia soldanella

갯메꽃 뿌리로부터 분리된 내생진균의 식물생장촉진활성

  • You, Young-Hyun (Department of Life Sciences and Biotechnology, Kyungpook National University) ;
  • Yoon, Hyeok-Jun (Department of Life Sciences and Biotechnology, Kyungpook National University) ;
  • Woo, Ju-Ri (Department of Life Sciences and Biotechnology, Kyungpook National University) ;
  • Seo, Yeong-Gyo (Department of Life Sciences and Biotechnology, Kyungpook National University) ;
  • Shin, Jae-Ho (School of Applied Biosciences, Kyungpook National University) ;
  • Choo, Yeon-Sik (Department of Biology, College of National Sciences, Kyungpook National University) ;
  • Lee, In-Jung (School of Applied Biosciences, Kyungpook National University) ;
  • Kim, Jong-Guk (Department of Life Sciences and Biotechnology, Kyungpook National University)
  • Received : 2011.09.19
  • Accepted : 2011.11.09
  • Published : 2011.12.28
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Abstract

Eight endophytic fungal strains were isolated from the roots of Calystegia soldanella from the western coast of South Korea. The culture filtrate of the eight endophytic fungi were applied to waito-c rice seedlings in order to verify potential plant growth promotion activities. The results of bioassay indicated that the Cs-9-7 fungal strain possessed the highest plant growth promotion activity. Fungal culture filtrates were analyzed to verify secondary metabolites using gas chromatography and mass spectroscopy with selected ion monitoring (GC/MS-SIM). The culture filtrate of the Cs-9-7 fungal strain was confirmed to contain gibberellins GA3 (1.229 ng/mL), GA4 (3.535 ng/mL), GA7 (1.408 ng/mL) and GA12 (0.378 ng/mL). Polymerase chain reactions (PCR) were performed so as to determine the internal transcribed spacer (ITS) regions for the identification of isolated strains with universal primers ITS-1 and ITS-4. The Cs-9-7 fungal strain, isolated from the root of C. soldanella, has been named Aspergillus tubingensis Cs-9-7.

서해안에 자생하는 갯메꽃의 뿌리로부터 8종의 내생진균을 분리하였다. 그리고 식물생장촉진검정을 확인하기 위하여 분리된 내생진균의 배양여액을 난장이벼에 처리하였다. Cs-9-7 균주의 배양여액 처리구에서 난장이벼의 생장촉진활성이 가장 높았다. 그리고 Cs-9-7 균주의 배양여액은 GC/MS-SIM을 사용하여 이차대사산물을 분석하였을 때, $GA_3$(1.229 ng/mL), $GA_4$(3.535 ng/mL), $GA_7$(1.408 ng/mL) 그리고 $GA_{12}$(0.378 ng/mL)의 지베렐린이 확인되었다. 그리고 분리된 내생진균의 동정을 위하여, 유니버샬 프라이머 ITS1과 ITS4를 사용하여 ITS 영역의 염기서열을 결정하였다. Cs-9-7 균주의 동정결과 A. tubingensis와 99%의 유사성이 확인되었으며, A. tubingensis Cs-9-7라고 명명하였다.

Keywords

References

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