한국미생물·생명공학회지 (Microbiology and Biotechnology Letters)

  • 제30권2호
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  • Pages.135-141
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  • 2002
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  • 1598-642X(pISSN)
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  • 2234-7305(eISSN)
한국미생물·생명공학회 (The Korean Society for Microbiology and Biotechnology)
권호 표지

대파 뿌리로부터 흑색썩음균핵병균에 길항하는 Serratia plymuthica AL-1의 분리 및 Chitinase의 생산

Chitinase Production and Isolation of Serratia plymuthica AL-1 Antagonistic to White Rot Fungi from Allium fistulosum Roots.

  • 주길재 (경북대학교 농화학과) ;
  • 이익희 (상주대학교 식물자원학과) ;
  • 김진호 (상주대학교 식물자원학과)
  • 발행 : 2002.06.01
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초록

대파 뿌리로부터 근권미생물 146종을 분리하여 대파 흑색썩음균핵병균인 Sclerotium cepivorum에 길항하는 AL-1 균주를 최종선별하였다. 분리주 AL-1은 the procaryotes와 Bergey's mannual of systematic bacteriology의 방법과 16S rDNA의 부분염기서열을 결정하여 ribosomal database 에서 상동성 검색 등의 방법으로 Serratia plymuthica로 동정되었다. S. plymuthica AL-1은 흑색썩음균핵병균(Sclerotium cepivorum)에 대해서는 생육저지환의 크기가 15mm로 나타났으며, 고추 검은무늬병(Alternaria altrata)은 9 mm, 고추 탄저병균(Colletotrichum gleosporioids)은 13 ㎜, 도라지 줄기마름병균(Phoma sp.)은 10 ㎜, 고추 잘록병균 (Rhizoctonia solani)은 8 ㎜, 고추 흰별무의병균(Stemphylium solani)은 8 ㎜, 오이 균핵병균(Sclerotinia sclerotiorum)은 7 mm, 수박 덩굴쪼김병(Fusarium oxysporium niveum)은 7 ㎜로 길항력을 나타내었으나 참외 만고병균(Didymella bryoniae)에서는 길항력이 없었다. S. plymuthica AL-1는 1％ colloidal chitin을 첨가한 TSB 배지에서 분자량 10 kDa 이상의 분획에서는 chitinase(3.2 units/ml)가 유도 생산되었고 80℃에서 30분간 열처리할 경우 chitinase의 활성은 없어 졌으나 길항력(6.4 ㎜)은 남아있었다. 또한 분자량 10kDa 이하의 분획에서는 chitinase 활성은 없으나 길항력(5.2㎜)은 나타내었고, 80℃에서 열처리하여도 길항력(5.0mm)이 남아있어 효소 이외 다른 생리활성물질이 존재함을 확인하였다.

This study was carried out to isolate antagonistic bacterium against Sclerotium cepivorum causing Allium fistulosum white rot. Total of 146 strains were isolated from A. fistulosum roots. The isolates were screened for antagonism to S. cepivorum and the isolated strain No. AL-1 was selected among these bacteria. It was identified as Serratia plymuthica based on morphological and physiological characteristics according to the Bergey's mannual of systematic bacteriology and 16S rDNA sequences methods. Serratia plymuthica AL-1 showed broad spectrum of antifungal activities against plant pathogenic fungi Alternaria altrata, Colletotrichum gleosporioids, Phoma sp., Rhizoctonia solani, Sclerotinia sclerotiorum, Stemphylium solani, Fusarium oxysporium niveum but not inhibited Didymella bryoniae. When S. plymuthica AL-1 cultivated in the TSB medium containing 1％ colloidal chitin, the high molecular fraction (>10 kDa) have chitinase activity (3.2 units/ml) and the low molecular fraction (<10 kDa) have not chitinase activity. Oppositely, after heat treatment (80℃ for 30 min) of the cultivation supernatant, the high molecular fractions have not antifungal activity but the low molecular fractions have antifungal activity.

키워드

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