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題名 | Enzymatic Changes During the Senescence of Field Grown Rice=老化對水稻葉片酵素活性之影響研究 |
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作者姓名(中文) | 宋濟民; | 書刊名 | 中華農學會報 |
卷期 | 139 1987.09[民76.09] |
頁次 | 頁8-16 |
分類號 | 434.113 |
關鍵詞 | 水稻; 老化; 活性; 葉片; 酵素; |
語文 | 英文(English) |
中文摘要 | 本實驗以田間生長的水稻(臺農67號)為材料,分析穀粒充實期間劍葉與第三葉葉綠素,可溶性蛋白質,蛋白質分解酵素,核酮糖二磷酸翔化酵素與葡萄糖-6-磷酸去氫酵素等,於葉片老化時的變化情形。試驗結果顯示:葉片老化時,可溶性蛋白質降低較葉綠素降低為早,但蛋白質分解酵素之活性並不伴隨著可溶性蛋白質降低而改變。在葉片老化早期,核酮糖二磷酸翔化酵素與葡萄糖-6-磷酸去氫酵素之活性(以鮮重為基礎)即急速下降,然而兩者之比活性(以蛋白質為基礎)在老化早期並沒有顯著的改變,直至老化後期其比活性才降低。因此,在檢定葉片老化時測定核酮糖二磷酸翔化酵素或葡萄糖-6-磷酸去氫酵素之活性改變(以鮮重為基礎)是可行的方法。 |
英文摘要 | Leaf senescence in field-grown rice (Oryza sativa L. cv. Tainung 67) was evaluated during the post anthesis period. The flag leaves and third leaves were measured for the chlorophyll (Chl) and soluble protein contents proteinase activity, ribulose-1, 5-bisphosphate carboxylase (RuBP Case) activity and glucose-6-phosphate dehydrogenase (G-6-P DH) activity. In general, soluble protein content in senescing leaf declined at an earlier stage than Chl content. The loss of soluble protein did not associate with the changes in proteinase activity. Both the RuBP Case and G-6-P DH activity, expressed on volume (fresh weight tissue) basis, tended to decline rapidly at the early stage of senescence. However, no significant specific activity (on soluble protein basis) decline was observed in these two enzymes until the final stage of senescence. It appears that the identification of leaf senescence by assaying the enzyme activity in RuBP Case of G-6-P DH is technically feasible, if the enzyme activity is expressed on fresh weight leaf tissue basis instead of soluble protein basis. |
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