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Hydraulic design of leaves: insights from rehydration kinetics


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Zwieniecki, MA, Brodribb, TJ and Holbrook, NM 2007 , 'Hydraulic design of leaves: insights from rehydration kinetics' , Plant, Cell and Environment, vol. 30, no. 8 , pp. 910-921 , doi: 10.1111/j.1365-3040.2007.001681.x.

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We examined the leaf hydraulic design in 10 species based on
their rehydration kinetics. In all cases, a biphasic response
described the temporal pattern of water uptake, with time
constants of ~30 to 800 s and ~800 to 8000 s. The time constants
of the fast phase were significantly shorter in the six
angiosperms (30 to 110 s) compared with the two singleveined
conifer species (>400 s) examined, while the two
multi-veined gymnosperm species, Gnetum gnemon and
Ginkgo biloba, had time constants for the fast phase of
~150 s. Among angiosperm species, the fast phase constituted
50–90% of the total water absorbed, whereas in gymnosperms
70–90% of the water uptake could be assigned to
the slow phase. In the four gymnosperms, the relative water
uptake corresponding to the fast phase matched to a good
degree the relative volume of the venation and bundle
sheath extension; whereas in the angiosperm species, the
relatively larger water influx during the fast phase was
similar in relative volume to the combined venation, bundle
sheath extension, epidermis and (in four species) the spongy
mesophyll. This suggests a general trend from a design in
which the epidermis is weakly connected to the veins (all
four gymnosperms), to a design with good hydraulic connection
between epidermis and veins that largely bypasses the
mesophyll (four of six angiosperms), to a design in which
almost the entire leaf appears to function as a single pool.

Item Type: Article
Authors/Creators:Zwieniecki, MA and Brodribb, TJ and Holbrook, NM
Keywords: venation pattern; bundle sheath extension; transpiration stream; hydraulic compartmentalization.
Journal or Publication Title: Plant, Cell and Environment
ISSN: 0140-7791
DOI / ID Number: 10.1111/j.1365-3040.2007.001681.x
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