Do increases in xylem sap pH and/or ABA concentration mediate stomatal closure following nitrate deprivation?

@article{Dodd2003DoII,
  title={Do increases in xylem sap pH and/or ABA concentration mediate stomatal closure following nitrate deprivation?},
  author={Ian C. Dodd and Lay Poh Tan and Jie He},
  journal={Journal of experimental botany},
  year={2003},
  volume={54 385},
  pages={1281-8}
}
Stomatal conductance (g(s)) of pepper (Capsicum annuum L.) plants decreased during the second photoperiod (day 2) after withholding nitrate (N). Stomatal closure of N-deprived plants was not associated with a decreased shoot water potential (Psi(shoot)); conversely Psi(shoot) was lower in N-supplied plants. N deprivation transiently (days 2 and 3) alkalized (0.2-0.3 pH units) xylem sap exuded from de-topped root systems under root pressure, and xylem sap expressed from excised shoots by… CONTINUE READING
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