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題 名 | 乙烯對Mesembryanthemum Crystallinum L.景天酸代謝之調節=The Regulation of Crassulacean Acid Metabolism in Mesembryanthemum Crystallinum L. by Ethylene |
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作 者 | 吳昭慧; 朱鈞; | 書刊名 | 中華農學會報 |
卷 期 | 178 1997.06[民86.06] |
頁 次 | 頁89-103 |
分類號 | 373.1 |
關鍵詞 | 景天酸代謝; 乙烯; 逆境; 磷酸烯醇丙酮羧化酶; 蘋果酸; Crassulacean aicd metabolism; Ethylene; Stress; Phosphoenolpyruvate carboxylase; Malate; |
語 文 | 中文(Chinese) |
中文摘要 | 不同的環境逆境引發MesembryanChemum crystallinum L.各種生理、生化的反應 , 不僅誘導產生獨特酵素,而且整個光合作用形式也由 C �鬥玲酮隻陵藹Q用水份的景天酸 代謝。 本試驗以 M. crystallinum 植物為材料, 澆灌 400 mM NaCl, 以及 1.37 mM ethephon 葉面噴施處理,探討乙烯對景天酸代謝調節之影響。 結果顯示外加 ethephon 處 理會抑制 NaCl 誘導 PEPCase 活性增加的效果,並且蘋果酸與可滴定酸含量減少, 日夜週 期性變化也較不顯著。而植株經 NaCl 處理,內生 ACC 含量降低其 PEPCase 活性也有增加 的情形。 進一步以 SDS-PAGE 電泳分析和西方墨點法分析,結果顯示隨著發育過程或 NaCl 處理, 其 PEPCase 蛋白質含量增加, 而 Rubisco 蛋白質含量有減少的趨勢。 然而以 ethephon 處理會抑制 PEPCase 蛋白質的累積, 促進 Rubisco 蛋白質含量增加。 因此, NaC1 誘導 M. crystallinum 由 C �鬥玲酮� CAM 型,乙烯的減少亦可能是調節原因之一。 |
英文摘要 | Different environmental stresses induce various physiological and biochemical responses in common ice plant (Mesembryanthemum crystallinum L.). The induced changes encompass not only the induction of individual enzymes, but also the switch of photosynthetic mode from C �� to crassulacean acid metabolism and increase in water use efficiency. The ice plants grown in the pots were watered with 400 mM NaCl and foliar-treated ethephon. Their influences on the CAM through the effect of ethylene were studied. The results were outlined as follows: Upon spraying ethephon, the NaCl-stressed plants exhibited a significant decrease in PEPCase activity and minimal diurnal fluctuation in total titratable acidity and malate content in the leaves. Nocturnal accumulation of total titratable acidity and malate was higher in expression was inhibited by the treatment ethephon. Endogenous ACC level was decreased and PEPCase activity was enhanced in 5-week-old plants treated with 400 mM NaCl. The results from electrophoretic and western immunoblotting stuides indicated the amount of PEPC polypeptide was incrased and the amount of Rubisco polypeptide wasdecreased during the developmental course of the plants or under NaCl stress. However, ethephon application tended to increase the amount of Rubisco polypeptide and decrease the amuount of PEPC polypeptide. It is possible that one cause of the switch of photosynthetic mode from C �� to CAM may be regulated by reduction of ethylene release in M. crystallinum. |
本系統中英文摘要資訊取自各篇刊載內容。