Journal of Plant Biotechnology

The Korean Society of Plant Biotechnology (한국식물생명공학회)
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The Role of Nitric Oxide on the Growth Regulation of Chinese Cabbage (Brassica campestris L.) Primary Leaves

배추 (Brassica campestris L.) 제 1엽의 생장조절에 대한 Nitric Oxide의 역할

  • Ham Jeong-Hun (Department of Biological education, Graduate School, Kangwon National University) ;
  • Jin Chang-Duck (Division of Life Sciences, Kangwon National University)
  • 함정훈 (강원대학교 교육대학원) ;
  • 진창덕 (강원대학교 생명과학부)
  • Published : 2005.12.01
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Abstract

The possible role of nitric oxide (NO)-induced cell division was investigated to explain the physiologycal effects of a NO donor, sodium nitroprusside (SNP) on the growth of primary leaves in chinese cabbage seedling plants. Exogenous treatment of SNP to chinese cabbage plants for 8 days at different concentrations (0, 200, 500 and 1000 ${\mu}M$) affected the leaf growth in a concentration-dependent manner, showing a maximum growth at $200\;{\mu}M$. In accordance with leaf growth responses, the chlorophyll and soluble protein contents increased strongly to 142% and 134% of control at $200\;{\mu}M$ SNP, respectively. However, a very little decrease in chlorophyll and a 13%> decrease in protein were observed at $1000\;{\mu}M$ SNP. In addition, the content of DNA and RNA also increased maximumly to 142% and 139% of the control at $200\;{\mu}M$ SNP, respectively, whereas they decreased to 80% and 84% of the control at $1000\;{\mu}M$ SNP. With respect to the development of enzymes related to cell wall synthesis, $200\;{\mu}M$ SNP led to the maximum activities in both phenylalanine ammonia-lyase (212% of the control) and guaiacol peroxidase (134% of the control). However, the activities of both enzymes were not modified significantly at $1000\;{\mu}M$ SNP. In conclusion, these results suggest that the enhancement of leaf growth in chinese cabbage plants by SNP at the effective concentration was probably due to the NO ability in the induction of cell division.

배추 유식물 제 1엽의 생장에 미치는 sodium nitroprusside(SNP: NO 공여체)의 생리적 효과를 NO에 의한 세포 분열조절의 가능성 수준에서 조사하였다. 배추 유식물에 서로 다른 농도의 SNP (0, 200, 500 및 $1000\;{\mu}M$)를 8일간 처리하고 배양한 결과 $200\;{\mu}M$ SNP 농도에서 최대 잎 생장을 보이면서 처리농도 의존 방식으로 잎의 생장에 영향을 끼쳤다. 잎의 생장반응과 일치하여, 잎의 엽록소 및 수용성 단백질 함량은 $200\;{\mu}M$농도에서 최대로 증가하여 각각 대조구의 142%와 134%수준을 보였으나, 오히려 $1000\;{\mu}M$처리농도에서는 엽록소의 경우 미미한 감소와 그리고 단백질 함량에서는 13%의 감소가 일어났다. 게다가, 잎 조직의 DNA와 RNA 함량 역시 $200\;{\mu}M$ 처리시 최대로 증가하여 각각 대조구의 142% 및 139% 수준을 보였으나, 반면에 $1000\;{\mu}M$ 농도에서는 각각 대조구의 80% 및 84% 수준까지 감소되었다. 세포벽 합성과 관련된 효소 활성도 변화에서 phenylalanine ammonia-lyase와 guaiacol peroxidase 활성도는 $200\;{\mu}M$ SNP 처리시 대조구에 비해 각각 최대 212%와 134% 증가 하였으나, $1000\;{\mu}M$ 농도에서는 두 효소 활성도 모두 유의한 변화를 보이지 않았다. 결론적으로, 이들 결과는 효과적인 농도에서의 SNP 처리에 의한 배추 제 1엽의 생장 촉진 현상은 세포분열 유도에 대한 NO의 능력에 기인될 수 있음을 제시하는 것이다.

Keywords

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