作物学报2000，Vol.26Issue(5)：605-608,4.
光照和水流阻力对小麦蒸腾波动的影响
The Effect of Light Intensity and Water Flow Resistance on Transpiration Oscillation in Young Wheat Leaves
廖建雄 1王根轩1
作者信息
- 1. 兰州大学干旱农业生态国家重点实验室,甘肃,兰州,730000
- 折叠
摘要
Abstract
The transpiration oscillation phenomena of young wheat leaves were observed in a plant growth chamber. When photon flux density (PFD) decreased, transpiration oscillations occurred and its period was relative to the mount of decrease. During oscillation under 100 μmol m-2s-1 illumination, the frequency and amplitude decreased after PFD was decreased to 30 μmol m-2s-1. When an external pressure was applied to the leaf sheath xylem vessels near the leaf base of young wheat, a resistance to water flow at the deformation site was achieved and transpiration oscillation was induced under steady environment. After the root system of young wheat was cut below the water surface, no oscillation was observed when changed the light intensity. All the phenomena show: water flow resistance is the important prerequisite to cause transpiration fluctuation, and the latter can be the result of stomatal oscillation.关键词
小麦/光子流密度/水流阻力/蒸腾波动Key words
Wheat/Photon flux density/Water flow resistance/Transpiration oscillation分类
农业科技引用本文复制引用
廖建雄,王根轩..光照和水流阻力对小麦蒸腾波动的影响[J].作物学报,2000,26(5):605-608,4.
