頁籤選單縮合
題 名 | 不同耐冷品系高粱幼苗在低溫下之生理反應=Physiological Responses of Different Chilling-Tolerant Sorghum(Sorghum bicolor L.)Lines to Low Temperature |
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作 者 | 高小玲; 盧虎生; 朱鈞; | 書刊名 | 中華農學會報 |
卷 期 | 173 1996.03[民85.03] |
頁 次 | 頁28-43 |
分類號 | 434.157 |
關鍵詞 | 高粱; 耐冷性; 木質部泌出液; 葉片氣孔導度; 根部活力; Sorghum; Chilling tolerance; Leaf stomatal conductance; Xylem sap; Root TTC activity; |
語 文 | 中文(Chinese) |
中文摘要 | 本試驗以不同低溫耐性的高粱品系為材料,探討低溫處理對其生理反應之影響。試驗結果顯示,參試的品種中以2R品系的低溫耐性最強,而80A品系對低溫最敏感。2R品系在低溫下氣孔快速關閉,葉片鮮重與水分含量均可維持,植株並無明顯枯萎的現象;而不耐低溫的80A品系,低溫處理後氣孔無法快速關閉,鮮重下降,葉片明顯脫水枯萎。此外低溫下2R品系根部水分傳導能力(root hydraulic conductance)較80A為高,故仍可在低溫下維持根部吸水能力。由此可知,氣孔無法快速關閉與根部吸水能力的降低是導致80A幼苗在低溫下枯萎受害的主要原因。 |
英文摘要 | Chilling has been an environmental stress of sorghum at seedling stage in Taiwan. The objectives of this research were to study the physiological responses of sorghum seedlings to low temperature. Results showed that 2R and 80A were the most chilling tolerant and chilling sensitive line, respectively, among the materials examine. Under chilling condition, water content and fresh weight of shoots of 80A decreased rapidly and the leaves dehydrated significantly after being exposed for 1 day. However, under the same condition little water lose in 2R leaves was observed. Electrolyte leakage in leaves of 80A increased rapidly with the time of cold treatment, whereas apparent less increase was shown in 2R seedlings. The difference of leaf stomatal conductance and root hydraulic conductance between 2R and 80A were also examined. Results showed that leaf stomtal conductance of 2R reduced rapidly after being transferred to 5/5°C treatment, wherease 80A stayed at a high level similar to the control during the chilling period. In addition, 2R showed a significantly higher root TTC reductase activity and xylem exudation rate than 80A under low temperature. These results suggest that reduced stomatal conductivity, increased root activity and well maintained water balance during chilling treatment maybe the mechanism of chilling tolerant for 2R. |
本系統中英文摘要資訊取自各篇刊載內容。