AFTEREFFECT OF WATER STRESS ON TRANSPIRATION RATE AND CHANGES IN ABSCISIC-ACID CONTENT OF YOUNG WHEAT PLANTS
AFTEREFFECT OF WATER STRESS ON TRANSPIRATION RATE AND CHANGES IN ABSCISIC-ACID CONTENT OF YOUNG WHEAT PLANTS
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DOI：
10.1111/j.1399-3054.1977.tb05548.x
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发表时间：
1977-01-01
影响因子：
6.4
通讯作者：
LARSSON, S
中科院分区：
文献类型：
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作者：
BENGTSON, C;FALK, SO;LARSSON, S
通过冷却根部，使小麦幼苗（Triticum aestivum L. cv. Weibulls Starke II）暴露在水分胁迫下 1、2 或 3 小时。在胁迫期间，植物受到持续的水分胁迫。通过这种处理，叶水势从-6.5巴降低至-11.5巴。在胁迫期和恢复期间测定叶水势、蒸腾速率和脱落酸含量。受水胁迫的植物表现出对蒸腾速率的后效应，持续 10-24 小时，具体取决于胁迫的持续时间。与对照相比，受胁迫植物中的水胁迫量定义为在胁迫期间对照植物和受胁迫植物之间叶水势的差异随时间的积分。对蒸腾作用的后效应量类似地定义为恢复期内对照植物和受胁迫植物之间蒸腾速率的差异随时间的积分。水分胁迫量与对叶片蒸腾作用的后效应量之间存在线性关系。根据胁迫持续时间，叶子的脱落酸含量增加到原始含量的 3.0 至 4.5 倍。在恢复过程中，所有 3 个应激期的脱落酸含量在 3 小时内恢复到应激前水平。因此，后效与叶子的脱落酸含量之间没有直接关系。
Young wheat plants (Triticum aestivum L. cv. Weibulls Starke II) were exposed to water stress for 1, 2 or 3 h by cooling the roots. The plants were subjected to a constant water stress during the stress periods. By this treatment the leaf water potential was lowered from -6.5 to -11.5 bars. Leaf water potential, transpiration rate and abscisic acid content were determined during the stress periods and during the recovery. The water stressed plants showed an after-effect on transpiration rate lasting for between 10-24 h depending on the duration of the stress. The amount of water stress in the stressed plants compared with the controls is defined as the difference in leaf water potential between the controls and the stressed plants during the stress period integrated over time. The amount of after-effect on transpiration in analogously defined as the difference in transpiration rate between the controls and the stressed plants during the recovery period integrated over time. There was a linear relationship between the amount of water stress and the amount of after-effect on transpiration of the leaves. The abscisic acid content of the leaves increased between 3.0 and 4.5 times the original content depending on the duration of the stress. During the recovery the abscisic acid content reattained the pre-stress level within 3 h for all 3 stress periods. There was thus no direct relationship between the after-effect and the abscisic acid content of the leaf.