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- 臺灣水韭景天酸代謝現象(CAM) 之研究
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題名 | 臺灣水韭景天酸代謝現象(CAM) 之研究= |
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作者 | 張永達; 楊冠政; |
期刊 | 師大生物學報 |
出版日期 | 19881000 |
卷期 | 23 1988.10[民77.10] |
頁次 | 頁157-165 |
分類號 | 378.113 |
語文 | chi |
關鍵詞 | 水韭; 代謝現象; 景天酸; 臺灣; |
中文摘要 | 臺灣特有之臺灣水韭(Isoetes taiwanensis DeVol)不論生長在夢幻湖中或溫室栽培,其葉片萃取液中蘋果酸(malic acid)之含量,早晨及黃昏有明顯的差異;早晨之含量約10-13 mg/g鮮重,黃昏約1-3mg/g鮮重。葉片萃取液的pH值(晨昏之變化在3-4及5-6之間)及可滴定酸(titrable acid)晨昏之變化在220及20ueq/g鮮重之間)亦隨蘋果酸之變化而有變化。顯然臺灣水韭是一種具有景天酸代謝(Crassulacean Acid Me - tabolism)現象之植物。球莖(corm )之可滴定酸,晨昏無明顯變化。暴露空氣中之葉片,其蘋果酸及可滴定酸晨昏之變化較小。 經研究與臺灣水韭之生長有關之環境因子,筆者認為臺灣水韭之CAM現象,有利於其對夢幻湖之日照及湖水中白天缺乏二氣化碳,晚上缺乏氧氣之適應,且有利於拓展臺灣水韭在湖中之生存領域。 |
英文摘要 | In the leaves (but not corms) of the submerged aquatic plant Isoetes taiwanensis, both in the field and greenhouse , malic acid concentration fluctuates from 10 - 13 mg / gfw in the morning to 1 - 3 mg/ gfw in the evening. Associated with this is a change in pH (a.m. pH3-4 vs. p.m. pH5-6) and titrable acidity (220 - 20 ueq / gfw change in acidity be tweenmomirg and evening) of the plant extract. It is obvious that Isoetes taiwanensi s is a CAM - like plant . The change of malic acid and titrable acidity are decreased when the leaves emerged. It is suggested that CAM in Isoetes taiwanensis may be related to the lower availability of CO2 for photosynthesis during the day than during the night, and short time high intensity light. |
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