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題 名 | Ecotypic Variation of Imperata Cylindrica Populations in Taiwan(2)--Physiological and Biochemical Evidence=白茅族群的生態變異(2)--生理及生化的證據 |
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作 者 | 張英峯; 周昌弘; | 書刊名 | Botanical Studies |
卷 期 | 47:2 民95.04 |
頁 次 | 頁175-184 |
分類號 | 377.2124 |
關鍵詞 | 白茅; 酒精去氫酵素; 脯胺酸; 鈉; Alcohol dehydrogenase; Imperata cylindrica; Proline; Sodium; |
語 文 | 英文(English) |
中文摘要 | 白茅(Imperata cylindrical var. major)是一種常見的禾本科雜草,在臺灣各地都有分布,且為一屬一種。尤其它生長在淡水紅樹林沼澤地。紅樹林環境相當特殊,不僅是鹽分地,又有週期性的淹水。作者分析野外環境下各地區白茅之酒精去氫酵素活性、脯胺酸與鈉含量。結果顯示在野外環境下竹圍白茅之酒精去氫酵素活性、脯胺酸與鈉含量比其它非紅樹林地區(沙崙及內湖)之白茅來得高。此外,將野外採得之白茅植於盆栽中並置於溫室內利用水耕實驗以缺氧及不同濃度之鹽分處理,以觀察並測試不同地區之白茅幼苗對缺氧之鹽分處理之生理反應。在缺氧處理下竹圍白茅可以忍受0ppm的缺氧逆境。其葉中之酒精去氫酵素活性比其它地區之白茅來得高。在鹽分處理下竹圍白茅可以忍受1%的鹽分逆境。其葉中之脯胺酸及根、莖中累積之鈉含量比其它地區之白茅來得高。這些生理及生化之分析顯示白茅生態期間之差異,以及竹圍生態型之獨特性。 |
英文摘要 | Cogon grass [IMperata cylindrical (I. cylindrical) L. Beauv. var. major], one of the top ten weeds in the world, is genus and one species in Taiwan. In the field, the alcohol dehydrogenase (ADH) activity, proline, and sodium content in tissues of I. cylindrical showed variation between the wetland (Chuwei) ecotype and the other two non-wetland ecotypes (Neihu and Sarlun). Moreover, in the greenhouse, flooding and salt treatment on the vegetative shoot of I. cylindrical showed that the Chuwei ecotype has higher survivability to flood and salt. A three-month flooding treatment led to a differential increase of ADH activity in leaf tissues of plantlet of Chuwei and Sarlun ecotypes. In addition, a four-day salt treatment led to a significant accumulation of proline in leaf tissues of Chuwei ecotype plantlets, yet to a significant amount of sodium accumulation in root and stem tissues of the Chuwei ecotype following an eight-day (short-term) and two-month (long-term) treatment. These physiological and biochemical differences revealed the ecotypic variation among among I. cylindrical ecotypes, and the wetland ecotype in Chuwei is physiologically distinct. |
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