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頁籤選單縮合
題名 | The Effect of Magnesium Ion on the Potassium Current of Maize Radicle Protoplasts=鎂離子對玉米幼根原生質體鉀電流的影響 |
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作者 | 楊灌園; 陳聖明; 張則周; Yang, Guan-yuang; Chen, Sheng-ming; Chang, Tse-chou; |
期刊 | 醒吾學報 |
出版日期 | 20021200 |
卷期 | 25 民91.12 |
頁次 | 頁351-363 |
分類號 | 434.14 |
語文 | eng |
關鍵詞 | 玉米幼根原生質體; 鎂離子; 鉀電流; 拮抗作用; PCT; Maize radicle protoplast; Magnesium ion; Potassium current; Patch clamp technique; Antagonism; |
中文摘要 | 將臺農351號玉米幼根原生質體分別浸泡在含鉀離子10mM及鎂離子0.3與3mM的外液中,然後研究原生質膜下之鎂離子對鉀電流的影響。當外液不含鉀離子,而僅有鎂離子存在時,此時沒有顯著的鉀電流產生。若是當外液同時含有10mM的鉀與3mM的鎂離子時。上述結果顯示,鉀離子與高低濃度的鎂離子共同存在時,鎂離子並不會影響鉀離子在原生質膜上的離子電流產生。我們推測,鉀、鎂離子彼乙並不會競爭質膜同側的離子孔道,至於田間試驗的鉀、鎂離子拮抗作用應屬於根部細胞之質外體作用。 |
英文摘要 | Radicle protoplasts of corn (Zea mays L. Var. Tanionon 351) under 0.3, 3mM magnesium and 10 mM potassium ions in bath solution was used to study the effect of magnesium ion on potassium currents through plasma membrane. There are no apparent current when bath solution contained no potassium ion but magnesium ion (0.3 and 3mM). Nevertheless, there are significant currents when bath solution contained 10 mM potassium and 0.3 or 3mM magnesium ions. These currents would inhibit by barium ion, which is potassium channel inhibitor. These results indicate that magnesium ion wouldn’t affect the potassium current’s going through cell membrane. We infer that the magnesium and potassium ions do not compete with each other for the same side on plasma membrane. The antagonism phenomenon shown on field experiments data could by mostly the contribution of apoplast. |
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