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| 題 名 | Comparative Sensitivity of Two Moroccan Wheat Varieties to Water Stress: The Relationship between Fatty Acids and Proline Accumulation=兩種摩洛哥小麥對水逆境之不同敏感度:脂肪酸和脯氨酸累積量之相關性 |
|---|---|
| 作 者 | Kaoua, Mimoun EL; Serraj, Rachid; Benichou, Mohamed; Hsissou, Driss; | 書刊名 | Botanical Studies |
| 卷 期 | 47:1 民95.01 |
| 頁 次 | 頁51-60 |
| 分類號 | 434.11 |
| 關鍵詞 | 水逆境; 光合作用能力; 脂質; 脯氨酸; Lipids; Photosynthetic; Capacity; Proline; Triticum aestivum; Water stress; |
| 語 文 | 英文(English) |
| 中文摘要 | 細胞膜脂,過氧化,乙型-胡蘿蔔素,脯氨酸累積,及光合作用都分別於兩種摩洛哥小麥(Triticum aestivum L.)品種,Nasma(適應於灌溉區)及Tigre(適應於半乾旱區),測定。供試植物在實驗室分別於供水及乾旱條件下生長於塑膠盆內。缺水30天後(相當於產量潛能之8%),葉中之脂肪酸含量(尤其是18C3雙鍵,即18:3 Δ9, 12, 15;此乃主要的不飽和脂肪酸)顯著地減少。減少程度Nasma比Tigre明顯。半乳糖脂,磷脂,及乙型-胡蘿蔔素含量在乾旱條件下於兩種小麥品種中都減少,但中性脂肪含量却增加。脂質之過氧化(以 malondialdehyde 量評估)於乾旱時增加(增率於Nasma及Tigre分別為41%及19%)。兩種小麥品種葉子於離體滲壓逆境時脯氨酸之累積量可添加18C脂肪酸及18C2雙鍵脂肪酸予以抑制。當培養基內添加上述兩種脂肪酸時,光合作用之受滲透逆境造成之抑制程度可減緩。脯氨酸之累積和膜安定度兩者間具正相關。本文討論這些生理反應和水逆境之關係。 |
| 英文摘要 | Membrane lipids, peroxidation, β-carotene content, proline accumulation, and photosynthetic activity were analyzed in two Moroccan wheat (Triticum aestivum L.) varieties, Nasma (adapted to irrigated zone) and Tigre (adapted to semi-arid zone). Plants were grown in plastic pots under laboratory irrigation and water stress conditions. One set of plants was subjected to regular water irrigation and another to water stress conditions created by water deprivation. After 30 days of water shortage (corresponding to 8% of field capacity), the leaves' fatty acid contents, especially that of Octadecatrienoic acid (18:3 Δ□), i.e. the major unsaturated fatty acid, significantly decreased. The decrease was more pronounced in Nasma varieties than in Tigre. The amount of galactolipids, phospholipids, and β-carotene decreased in droughted plants of both local wheat varieties while the content of neutral lipids increased. Lipid peroxidation, assessed as the content of malondialdehyde (MDA), was found to be augmented under stress. (The rate of increase was 41% and 19% in Nasma and Tigre respectively). The amount of proline accumulated in leaf segments of both varieties subjected in vitro to osmotic stress was suppressed by addition of octadecanoic or octadecadienoic acids. The inhibition of photosynthetic capacity under osmotic stress was reduced when fatty acids were added in medium. A positive relationship was observed between proline accumulation and membrane stability. The mechanisms of these physiological responses to water stress are discussed. |
本系統中英文摘要資訊取自各篇刊載內容。