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Relations between stomatal closure, leaf turgor and xylem vulnerability in eight tropical dry forest trees


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Brodribb, TJ, Holbrook, NM, Edwards, EJ and Gutierrez, MV 2003 , 'Relations between stomatal closure, leaf turgor and xylem vulnerability in eight tropical dry forest trees' , Plant, Cell and Environment, vol. 26, no. 3 , pp. 443-450 , doi: 10.1046/j.1365-3040.2003.00975.x.

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This study examined the linkage between xylem vulnerability,
stomatal response to leaf water potential (
), and
loss of leaf turgor in eight species of seasonally dry tropical
forest trees. In order to maximize the potential variation in
these traits species that exhibit a range of leaf habits and
phenologies were selected. It was found that in all species
stomatal conductance was responsive to
over a narrow
range of water potentials, and that
inducing 50% stomatal
closure was correlated with both the
inducing a
20% loss of xylem hydraulic conductivity and leaf water
potential at turgor loss in all species. In contrast, there was
no correlation between the water potential causing a 50%
loss of conductivity in the stem xylem, and the water potential
at stomatal closure (
) amongst species. It was concluded
that although both leaf and xylem characters are
correlated with the response of stomata to
there is
considerable flexibility in this linkage. The range of
responses is discussed in terms of the differing leaf-loss
strategies exhibited by these species.

Item Type: Article
Authors/Creators:Brodribb, TJ and Holbrook, NM and Edwards, EJ and Gutierrez, MV
Keywords: cavitation; percentage loss of conductivity; pressure–volume curve; stomatal closure; tropical dry forest trees; turgor loss point; water potential.
Journal or Publication Title: Plant, Cell and Environment
ISSN: 1365-3040
DOI / ID Number: 10.1046/j.1365-3040.2003.00975.x
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