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Sulfur Deficiency Effects on Sulfate Uptake and Assimilatory Enzymes Activity in Rape Plants

유채에서 황 결핍이 황산염 흡수 및 동화관련 효소활력에 미치는 영향

  • Li, Lu-Shen (Chonnam National University) ;
  • Jin, Yu-Lan (BK21 Research Team for the Control of Animal Hazards using Biotechnology, College of Agriculture & Life Science, Chonnam National University) ;
  • Lee, Bok-Rye (BK21 Research Team for the Control of Animal Hazards using Biotechnology, College of Agriculture & Life Science, Chonnam National University) ;
  • Kim, Tae-Hwan (Chonnam National University)
  • Published : 2009.06.30

Abstract

To determine $SO_4^{2-}$ uptake and its assimilation in response to the exogenous $SO_4^{2-}$supply level in forage rape (Brassica napus L.), the concentration of this element in plant tissues and the activity of ATP sulfurylasc and APS reductase was measured after 25 hours of treatment (1.0 mM $SO_4^{2-}$, control; 0.1 mM $SO_4^{2-}$, S deficiency; 0 mM $SO_4^{2-}$, S deprivation). $SO_4^{2-}$ uptake and the concentration in the plant tissues significantly decreased in S-deficient and S-deprived condition, while it maintained at nearly same level in the control. The activity of ATP sulfurylase tended to increase with decreasing the exogenous $SO_4^{2-}$ supply, while that of APS reductase to decrease. A significant change in both enzymes responding to S-deprivation treatment was observed only young and middle leaves. The results indicated that $SO_4^{2-}$ assimilation in young leaf tissues would be much more sensitively responded to S-limited nutrition.

유채(Brassica napus L.)에서 외생적 황 공급이 $SO_4^{2-}$ 흡수와 동화에 대한 영향을 알아보고자 $SO_4^{2-}$ 농도를 세가지 수준(1 mM $SO_4^{2-}$, 대조구; 0.1mM $SO_4^{2-}$, 결핍; 0 mM $SO_4^{2-}$, 무공급)으로 25시간 처리한 후 식물조직내에서의 $SO_4^{2-}$ 농도, ATP sulfurylase와 APS reductase 활성을 측정하였다. $SO_4^{2-}$의 흡수와 식물조직내에서의 $SO_4^{2-}$의 농도는 결핍과 무공급 조건하에서 현저하게 감소하였다. ATP sulfurylase 활성은 외부 황 공급의 감소에 따라 증가한 반면 APS reductase 활성은 감소하였다. 황 무공급에 따른 이 두 효소 활력의 유의적인 차이는 어린잎과 중간잎에서만 고찰되었다. 이러한 결과는 한정된 황 조건하에서 특히 어린잎에서 $SO_4^{2-}$ 동화는 더욱 민감하게 반응한다는 것을 제시한다.

Keywords

References

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