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題名 | In Vivo Leaf Blade and Petiole Nitrate Reductase Activity, and Nitrate Content of Selected Vegetables During Vegetative Growth=蔬菜在營養生長期中葉片和葉柄硝酸態氮含量及其還原酵素活力的初步比較 |
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作者 | 朱昌祺; |
期刊 | 中華農學會報 |
出版日期 | 19910900 |
卷期 | 155 1991.09[民80.09] |
頁次 | 頁40-45 |
分類號 | 435.2 |
語文 | eng |
關鍵詞 | 生長; 含量; 活力; 氮; 硝酸態; 葉片; 葉柄; 酵素; 蔬菜; 營養; 還原; |
中文摘要 | 植物葉柄中的硝酸態氮還原酵素活力,一般認為很低而不予重視。本文報告在溫室栽培的44種蔬菜中,這種酵素活力的測定結果。測定時係用簡易的in vivo方法,同時分析硝酸態氮含量及其還原酵素的活力。結果指出,在營養生長期時,葉柄中有顯著的硝酸態氮還原酵素的活力。測定的44種蔬菜中,有11種其葉柄硝酸態氮還原酵素的活力和葉片中的活力相若,有3種且超過葉片的活力。以此推論,葉柄硝酸態氮還原酵素對某些植物氮素新陳代謝作用,可能有實質上的貢獻。 |
英文摘要 | Petioles of plants are not generally considered to be major sites of nitrate reductase activity (NRA). Studies were conducted to determine the significance of petiole NRA from 44 greenhouse-grown vegetables from 10 families and 34 genera. An in vivo assay with endogenous nitrate-N only was used to compare petiole NRA and leaf blade NRA. In addition, nit4rate-N content of the plant materials was determined. Results indicated substantial petiole in vivo NRA in moset species / cultivars when plant were grown vegetativly, and that 14 species/cultivars had rates either similar to or higher than leaf blades. It is concluded that petiole NRA may contribute substantially to plant N metabolism in some species. |
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