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題名 | Drought Stress Effects on Photosynthetic Rate and Leaf Gas Exchange of Wheat=乾旱逆境對小麥光合作用速率與葉片氣體交換之影響 |
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作者 | Siddique,M. R. B.; Hamid,A.; Islam,M. S.; | 書刊名 | Botanical Bulletin of Academia Sinica |
卷期 | 40:2 1999.04[民88.04] |
頁次 | 頁141-145 |
分類號 | 434.11 |
關鍵詞 | 乾旱逆境; 光合作用; 葉片氣體交換; 小麥; Drought stress; Leaf gas exchange; Photosynthesis; Triticum aestivum L.; |
語文 | 英文(English) |
中文摘要 | 於半控制的條件下對小麥四種栽培品種 , 進行乾旱逆境影響光合作用速率與葉片氣體交換之評估。 四種栽培品種 kanchan 、 Sonlika 、 kalymosa 及 C306 皆種植於盆內以進行四個層次的水分逆境處理 , 在所有的栽培品種 ,kalymosa 於營養生長及開花時表現最高的光合作用速率。將植物曝露於乾旱逆境下 ,造成光合作用速率減少、氣孔及葉肉之導電度下降、以及細胞間二氧化碳濃度增加。植物於營養生長早期受乾旱處理 , 而後再生長於良好的灌溉條件下,發現其生理特性與未處理的對照組類似。光合作用速率減 少通常伴隨氣孔導電度的下降,然而此種弱關聯性亦顯示非受氣孔限制的光合作用似乎已經在運作。 |
英文摘要 | Drought stress effects on photosynthetic rate and leaf gas exchange characteristics of four wheat cultivars were evaluated under semi-controlled conditions. Four cultivars-Kanchan, Sonalika, Kalyansona, and C306, grown in pots-were subjected to four levels of water stress. Among the cultivars, Kalyansona showed the highest photosynthesis rates both at vegetative and at anthesis. Exposure of plants to drought stress led to noticeable decrease in photosynthesis rate, stomatal conductance and mesophyll conductance and a concomitant increase in intercellular CO2 concentration. Plants subjected to drought at the early vegetative stage displayed similar physiological characters subsequently under well-watered conditions as compared with control. Photosynthesis rates decreased with decrease in stomatal conductance, but a weak relationship between them implied that non-stomatal limitations to photosynthesis might have been in operation. |
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