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題 名 | Presoaking with Nitric Oxide Donor SNP Alleviates Heat Shock Damages in Mung Bean Leaf Discs=用一氧化氮釋放劑SNP預浸泡可緩解熱激對綠豆葉圓片的傷害 |
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作 者 | 楊甲定; 雲建英; 張銅會; 趙哈林; | 書刊名 | Botanical Studies |
卷 期 | 47:2 民95.04 |
頁 次 | 頁129-136 |
分類號 | 434.27 |
關鍵詞 | 抗氧化酶活性; 熱激; 膜完整性; 綠豆; 一氧化氮; 光化學活性; Antioxidant enzyme activity; Heat shock; Membrane integrity; Mung bean; Phaseolus radiatus; Nitric oxide; Photochemical efficiency; |
語 文 | 英文(English) |
中文摘要 | 本研究主要是探討外源施用的一氧化氮(NO)是否對熱激脅迫下的綠(Phaseolus radiatus)葉圓片具有一定的保護作用。綠豆葉圓片在蒸餾水和150μM的一氧化氮釋放劑SNP中分別預浸泡60分鐘,然後在45°C黑暗下熱激處理90分鐘。對照材料用蒸餾水預浸泡並放置在室溫(25°C)。以葉綠素螢光參數、細胞膜完整性、過氧化氫含量和抗氧化酶[catalase (CAT), guaiacol peroxidase (POD)與superoxide dismutase (SOD)]的活性為考察指標。與蒸餾水預浸泡-熱激處理的葉圓片相比較,SNP預浸泡可顯著提高光系統II的最大量子產率(Fv/Fm)、使熱激導致的電解質滲漏減少48%、使膜脂過氧化程度和過氧化氫含量保持在對照水準、因熱激而受抑的抗氧化酶活性也因SNP預浸泡而不同程度地恢復。另一方面,SNP預浸泡的這些作用能被牛血紅蛋白(一種有效的NO清除劑)所完全或部份去除,表明SNP的保護性作用應主要歸因於所釋放的NO。本實驗顯示,外源施用的NO釋放劑SNP能提高綠豆葉圓片在熱激下的光化學活性和細胞膜完整性,該作用可能是由於所釋放的NO恢復了熱激下受抑的抗氧化酶的活性,從而減輕了氧化傷害。 |
英文摘要 | The objective of this study was to examine whether exogenously applied nitric oxide (NO) have some protective role on mung bean (Phaseolus radiatus) leaf discs under hear shock. Leaf discs were presoaked in distilled water and sodium nitroprusside (SNP, a NO donor) solution (150μM) for 60 min respectively, then submitted to a heat shock at 45°C for 90 min in dark. Control materials were presoaked with distilled water and laid under room temperature (25°C). The chlorophyll a fluorescence parameters, membrane integrity, hydrogen peroxide (H2O2) content and activities of antioxidant enzymes [catalase (CAT), guaiacol peroxidase (POD) and superoxide dismutase (SOD)] were assayed. Compared with heat-shocked leaf discs, the maximal quantum yield of photosystem II (PSII) (measured as Fv/Fm) was significantly increased, electrolyte leakage due to heat shock was reduced by 48%, lipid peroxidation and H2O2 content were kept at control level by SNP presoaking. The suppressed activities of antioxidant enzymes by heat shock were all recuperated by SNP presoaking. On the other hand, these role of SNP presoaking were reversed fully or partially by bovine hemoglobin (a powerful NO scavenger), suggesting that protective effect by SNP is attributable to released NO. In conclusion, it appears that the exogenously applied NO donor SNP can promote higher leaf photochemical activity and cell membrane integrity in mung bean leaf discs under heat shock. This role is putatively due to that the released NO can recuperate suppressed activities of anti-oxidant enzymes, thus eliminating oxidative damage under heat shock tress. |
本系統中英文摘要資訊取自各篇刊載內容。