Journal of Plant Biotechnology

The Korean Society of Plant Biotechnology (한국식물생명공학회)
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Effects of Calcium on Nitric oxide (NO)-induced Adventitious Rooting Process in Radish (Raphanus sativus L.) Cotyledons

무 (Raphanus sativus L.) 자엽에서 산화질소 (Nitric oxide)에 의해 유도된 부정근 형성과정에 대한 칼슘의 효과

  • 진창덕 (강원대학교 자연과학대학 생명과학부)
  • Published : 2007.09.29
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Abstract

The treatment of radish cotyledons with a nitric oxide (NO)-releasing substance, sodium nitroprusside (SNP) resulted in an increased adventitious root development in a dose-dependent manner. However, this NO-mediated enhancement effect was reversed when either 0.5 mM EGTA (an extracellular $Ca^{2+}$ chelator) or 0.1 mM $LaCl_3$ (a calcium channel blocker) was applied with $50\;{\mu}M$ SNP. Our results also showed that guaiacol peroxidase (GPX) and syringaldazine peroxidase (SPX) activities, which are known to play a key role in rooting, were more largely increased during adventitious root induction in the cotyledons treated with SNP. However, the treatment of cotyledons with SNP plus $LaCl_3$ inhibited the SNP-induced increases in the activities of both GPX and SPX. Trifluoperazine (TFP), an antagonist of calmodulin (a specific calcium-binding protein), also delayed adventitious root formation and significantly reduced the root length and number of the SNP-treated cotyledons as well as the deactivation of GPX and SPX enzymes. In conclusion, our results suggest that calcium is involved in the NO response leading to induction of adventitious root through a regulation of GPX and SPX.

분리된 무 자엽 조직에 산화질소 (nitric oxide: NO) 공여체인 sodium nitroprusside (SNP) 처리 시 농도 의존방식으로 부정근의 발달을 증진시켰다. 그러나 이러한 NO 증진 효과는 세포외 칼슘 chelator인 0.5 mM EGTA 또는 세포막 칼슘채널 차단제인 0.1 mM $LaCl_3$를 각각 $50\;{\mu}M$ SNP와 함께 혼합처리 시 반전되었다. 또한, 뿌리 발생에서 중심적 역할을 수행하는 것으로 알려진 guaiacol peroxidase (GPX)와 syringaldazine peroxidase (SPX)의 활성도가 SNP 단독 처리된 자엽에서 부정근이 형성되는 동안 현저히 증가하였다. 그러나, SNP와 $LaCl_3$ 혼합처리 시 SNP에 의해 유도된 GPX와 SPX 활성도 증가가 거의 증류수 대조구 수준으로 억제되었다. calmodulin의 anatagonist인 trifuoperazine 역시 SNP로 처리된 자엽에서 부정근 형성을 억제하여 발생된 뿌리의 개수와 길이를 감소시켰으며 동시에 GPX와 SPX를 불활성화 하였다. 결론적으로, 이들 결과는 칼슘이 GPX와 SPX 활성도 조절을 통해 부정근 유도를 이끄는 NO 반응에 포함되어 있음을 나타내는 것이다.

Keywords

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