渗透胁迫下不同玉米品种叶片水分关系的研究

Study on Water Relationship of Different Maize Varieties under the Water Stress

通过盆栽及水培试验研究不同玉米品种在渗透胁下叶片的水分变化,结果表明:参试3个品种的气孔导度与光合速率、蒸腾速率均呈直线相关,但气孔导度对蒸腾速率的相关系数>气孔导度对光合速率的相关系数;品种间气孔调节能力为农大60>中单2号>陕单911;陕单911的渗透调节能力>中单2号>农大60,陕单911能通过较低的渗透势和细胞内溶质含量的增加,维持细胞吸水,从而维持叶片较高的相对含水量和叶水势,并具有较高的膨压,维持细胞的延伸生长。3个品种的耐脱水干化能力不同,失水速度为陕单911>农大60>中单2号。

Based on pot experiments and water experiments, the results showed： the relation of Gs,Pn and Tr of the varieties was linear, the correlativity between Gs and Tr was higher than that between Gs and Pn ; stoma adjustment ability was nongda 60 〉 zhong dan 2 〉 shandan 911 ; the osmosis adjust capacity was shandan 911 〉 zhongdan 2 〉 nongda 60, the excised leaf water retention capability was shandan 911 〉 nongda 60 〉 zhongdan 2