Water Potential and Stomatal Resistance of Sunflower and Soybean Subjected to Water Stress during Various Growth Stages.
Water Potential and Stomatal Resistance of Sunflower and Soybean Subjected to Water Stress during Various Growth Stages.
复制标题
向日葵和大豆在不同生长阶段遭受水分胁迫的水势和气孔阻力。
DOI：
10.1104/pp.58.4.537
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发表时间：
1976
期刊：
影响因子：
7.4
通讯作者：
P. Kramer
中科院分区：
文献类型：
--
作者：
N. Sionit;P. Kramer
两个大豆品种（Glycine max (L.)）在不同生长阶段，对Merr.)和两个向日葵品种（Helianthus annuus L.）进行了水分胁迫试验。随着胁迫的发展，测定叶片阻力和叶片水势。在黄豆叶片各水势和生育期，叶上表面的抗性均高于叶下表面。在水势较高时，上表面阻力开始增大，且增大幅度大于下表面阻力。复水4天后阻力恢复到预应力值。在向日葵各水势和生长阶段，上下叶表面的抗性基本一致。开花前胁迫的向日葵叶片抗性高于开花后胁迫的向日葵叶片抗性。-16 bar胁迫下的向日葵叶片在复水后数天内恢复了叶片抗逆性和水势，但-23 bar胁迫下的向日葵叶片死亡。大豆和向日葵的叶片在开花前受到的伤害要小于老植株，而向日葵在开花后受到的伤害要大于大豆。
Plants of two varieties of soybean (Glycine max (L.) Merr.) and two varieties of sunflower (Helianthus annuus L.) were grown in controlled environments and subjected to water stress at various stages of growth. Leaf resistances and leaf water potentials were measured as stress developed. In soybeans the upper leaf surface had a higher resistance than the lower surface at all leaf water potentials and growth stages. Resistance of the upper surface began to increase at a higher water potential and increased more than the resistance of the lower surface. Resistances returned to prestress values 4 days after rewatering. In sunflowers upper and lower leaf surfaces had similar resistances at all water potentials and growth stages. Leaf resistances were higher in sunflower plants stressed before flowering than in those stressed later. Sunflower plants stressed to -16 bars recovered their prestress leaf resistance and water potential a few days after rewatering, but leaves of sunflower plants stressed to -23 bars died. Leaves of soybean and sunflower plants stressed before flowering suffered less injury than those of older plants and sunflowers stressed after flowering suffered more injury than soybeans.