摘要
以适应性广的水稻品种“汕优 6 3”为材料 ,具有较高的光合速率但适应性较差的品系“NAU30 3”为对照 ,比较了不同阶段的叶片光合机构对于干旱处理的适应性。结果表明“汕优 6 3”具有较广泛的适应性 ,在逆境条件下仍能维持较高的光合速率 ,这可能和叶片中碳酸酐酶活性对逆境的响应程度高有关。
This paper compared the adaptability of leaf photosynthetic capacity to soil drought( -40 kPa ,4 d) treatment during different leaf development phases, using rice( Oryza sativa ) var. Shanyou 63 with a wider adaptability and var. NAU303 with a higher photosynthetic capacity. The results showed that Shanyou 63 had more stable photosynthesis than NAU303(Fig.1a). After drought treatment, its photosynthetic rate declined only by 33%, while that of NAU303 declined by 76%. The lower sensibility of the former's photosynthetic rate can be explained by its larger increase in carbonic anhydrase activity under drought stress (Fig.1b) . This kind of adaptability to soil drought appeared only during the reversible decline phase of leaf photosynthetic function(Figs.1,2).
基金
国家重点基础研究专项经费资助!(No.G1998010100)
关键词
碳酸酐酸
干旱处理
适应性
水稻
光合速率
photosynthesis,carbonic anhydrase, drought stress, adaptation, rice
