实验原理:植物在土壤-植物-大气连续系统中,根不断从土壤中吸收水分,而叶片又不断向周围环境散失水分,在这种水势梯度系统中,植物根-茎-叶也存在水势梯度,使木质部导管中的细小水柱受空气水势的负压影响,形成水分向上运输的拉力。当植物枝条或叶片被切下时,导管中这种被拉紧的水柱断裂,水柱会从切口向上端内侧收缩。将切下的材料装入仪器的压力室,使切口一端伸出室外密封起来,加压使枝条或叶片内的张力重新平衡,把小水柱推回恰到切口表面时为止,所加的压力的负值即为植物的水势值。 实验目的:测定水稻叶片的水势。
关键词: 水分, 水势梯度, 叶片张力
材料与试剂
仪器设备
实验步骤
注意事项
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