Sustained and significant negative water pressure in xylem

  title={Sustained and significant negative water pressure in xylem},
  author={W. Pockman and J. Sperry and J. W. O'leary},
  • W. Pockman, J. Sperry, J. W. O'leary
  • Published 1995
  • Chemistry
  • Nature
  • DESPITE two centuries of research, the mechanism of water transport in plants is still debated1–8.The prevailing cohesion–tension theory2,3, which states that water is pulled upwards by capillarity in cell-wall pores, remains vulnerable to challenge because its corollary is difficult to prove: that large negative pressures exist in xylem conduits4–7. Recent xylem pressure-probe and z-tube experiments suggest that cavitation limits xylem pressures to above −0.5 MPa, despite the much more… CONTINUE READING
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