Long Ashton Research Station, University of Bristol, BS18 9AF, Bristol, UK.
Planta. 1975 Jan;124(1):25-9. doi: 10.1007/BF00390064.
Addition of an osmoticum (-12 bars) to the rooting medium of sunflowers (Helianthus annuus L.) caused an increase in the level of abscisic acid (ABA) present in xylem exudate subsequently collected from cut shoots. Using tall and dwarf plants it was shown that there was a time lag in the appearance of increased levels of ABA in tall plants when compared with dwarf plants. The results indicate that the leaves, rather than the roots are the site of synthesis of ABA present in the xylem sap of osmotically stressed sunflower plants.
向向日葵（Helianthus annuus L.）生根介质中添加渗透剂（-12 巴）会导致随后从剪下的枝条中收集的木质部渗出液中脱落酸（ABA）的水平升高。使用高株型和矮株型植物表明，与矮株型植物相比，高株型植物中 ABA 水平升高的出现存在时间滞后。结果表明，在渗透胁迫的向日葵植物中，木质部汁液中的 ABA 是在叶片中合成的，而不是在根中合成的。
