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• W2036846516 abstract "산화질소(nitric oxide: NO) 공여체인 <TEX>$100{mu}M$</TEX> sodium nitroprusside (SNP)를 배추 잎에 전처리한 후 이어서 <TEX>$2{mu}M$</TEX> paraquat (PQ)처리 시, PQ에 의해 유도된 산화적 손상에 대한 잎의 내성이 효과적으로 증진되었다. 24 시간 광 배양기간 동안 PQ 단독 처리구 잎에서는 생체량, 엽록소 및 단백질 함량이 현저하게 감소하였으나 PQ 노출 전에 3시간 SNP 전처리로 이들 잎 손상이 의미 있게 완화되었다. 게다가 PQ 처리에 기인된 malondialdehyde (MDA)와 <TEX>$H_2O_2$</TEX> 함량 증가도 SNP 전처리에 의해 유의하게 억제되었다. 잎에서 이들 PQ 독성에 대한 SNP의 방어효과와 관련하여 ascorbate-glutathione 회로 구성 효소의 활성도 변화를 조사하였다. PQ 단독 처리구에서 APX, DHAR 및 GR 효소 활성도는 배양 6시간후에 급격히 감소되어 대조구 잎과 비교 시 각각 대조구의 19%, 50%, 39% 수준의 활성도 값을 보였다. 그러나, 이들 효소 활성도 값 감소는 SNP 전처리에 의해 현저하게 억제되어 6시간 배양 후에 PQ 단독처리구 보다 각각 5배, 2배, 1.5배 높은 값을 나타내었다. 또한, 그 이후 24시간 배양 때까지 PQ 단독 처리구보다 계속 높은 활성도를 보이면서 점차로 감소하였다. 이들 결과로부터, PQ에 노출된 배추 잎에서 SNP 전처리에 의한 ascorbate-glutathione 회로의 활성화가 <TEX>$H_2O_2$</TEX>의 축적을 억제하며 그로인해 PQ에 의해 유도된 산화스트레스로부터 잎을 방어하는 것으로 생각되었다. 동시에 이 들 결과는 산화질소가 배추 잎에서 PQ 스트레스에 대한 항산화 방어자로서의 역할을 하는 것을 의미한다. Pretreatment of chinese cabbage leaves with <TEX>$100{mu}M$</TEX> sodium nitroprusside (SNP), a nitric oxide (NO) donor, effectively improved their tolerance to subsequent <TEX>$2{mu}M$</TEX> paraquat (PQ)-induced oxidative damage. The fresh weight, and chlorophyll and protein contents in primary leaves treated with PQ alone were noticeably reduced over 24 h light incubation. However, these leaf injury symptoms were significantly alleviated with <TEX>$100{mu}M$</TEX> SNP pretreatment for 3 h prior to PQ exposure. In additions, the increase of the contents of malondialdehyde (MDA) and <TEX>$H_2O_2$</TEX> due to PQ exposure were significantly inhibited by SNP pretreatment. Together with the protective effects of SNP against PQ toxicity in leaves, the changes of ascorbate-glutathione cycle enzymes activities were examined. In the PQ alone treatment, the activities of APX, DHAR, and GR after 6 h incubation were rapidly reduced and showed 19%, 50% and 39% respectively, compared with those of the control. However, the decreases in these enzyme activities were significantly inhibited by SNP pretreatment. As a result, their activities were higher than those of PQ alone treatment by 5 times, 2 times, and 1.5 times, respectively, at 6 h incubation. Thereafter, these enzymes decrease their activities gradually showing high levels than those of PQ alone. Based on the above results, it can be assumed that the activation of ascorbate-glutathione cycle by SNP pretreatment in chinese cabbage leaves exposed to PQ can prevent <TEX>$H_2O_2$</TEX> accumulation, thereby leading to protection against PQ-induced oxidative stress. Also, these results indicate that NO acts as an protectant against PQ stress in the leaves of chinese cabbage." @default.
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• W2036846516 date "2014-06-30" @default.
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• W2036846516 title "Effects of nitric oxide on ascorbate-glutathione cycle enzymes activities in chinese cabbage leaves under paraquat-induced oxidative stress" @default.
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• W2036846516 doi "https://doi.org/10.5010/jpb.2014.41.2.73" @default.
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