Turgor Pressures in Phloem: Measurements on Hevea Latex.

@article{Buttery1964TurgorPI,
  title={Turgor Pressures in Phloem: Measurements on Hevea Latex.},
  author={Beresford Buttery and S G Boatman},
  journal={Science},
  year={1964},
  volume={145 3629},
  pages={285-6}
}
Hydrostatic pressures in laticiferous phloem tissues of Hevea brasiliensis trees exhibit a diurnal fluctuation, with minimum values occurring during the day. Pressure decreases with increasing height up the trunk, the gradient becoming greater under conditions of rapid transpiration. Sieve-tube turgor must be controlled independently if pressure-flow is to occur in the expected direction.