Ψl at peak foliage ABA level corresponds to
Ψtlp
In the angiosperm species U. californica mean turgor loss point
(Ψtlp) in never-before stressed plants was -3.66 ± 0.18
MPa (Figure 8). In leaves collected from plants approximately 10 d after
peak foliage ABA level, when Ψl had declined to -6 MPa,
Ψtlp was not significantly lower than never-before
stressed plants (t5.06, = 1.2042, p = 0.2817), with a mean
Ψtlp of -3.58 ± 0.20 MPa (Figure 8). Similarly, in the
conifer species C. rhomboidea , mean Ψtlp in
never-before stressed plants was -2.83 ± 0.34 MPa (Figure 8), which was
not significantly different than mean Ψtlp in branches
of plants that had experienced drought for at least 10 d after peak
foliage ABA levels (-3.04 ± 0.16 MPa, t7.98 = -1.69, p = 0.1296).