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Changes in leaf hydraulic conductance during leaf shedding in seasonally dry tropical forest

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Brodribb, TJ and Holbrook, NM (2003) Changes in leaf hydraulic conductance during leaf shedding in seasonally dry tropical forest. New Phytologist, 158 (2). pp. 295-303. ISSN 0028-646X

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Abstract

• The hydraulic conductance of leaves (
k
leaf
) was examined to determine whether
this little understood component of the water transport pathway plays a role
in governing leaf phenology of two deciduous dry forest trees (
Calycophyllum
candidissimum
and
Rhedera trinervis
).

k
leaf
was monitored in parallel with stem hydraulic conductivity (K
stem
) during the
transition from wet to dry season. The relationships between declining photosynthetic
quantum yield during senescence and declining
k
leaf
and K
stem
were compared.
• Divergent patterns were observed in the response of K
stem
to seasonal drying;
however, the behaviour of
k
leaf
was essentially similar in both species. Large (five- to
ten-fold) decreases in leaf hydraulic conductance occurred before, and during the
later stages of leaf senescence. During senescence, declining
k
leaf
, which continued
until leaves were ultimately shed, was associated with a concomitant decline in
quantum yield.
• We conclude that, in these species, the loss of hydraulic conductance of the leaf
vascular system is linked to, and possibly responsible for, the loss of photosynthetic
capacity during leaf senescence.

Item Type: Article
Journal or Publication Title: New Phytologist
Page Range: pp. 295-303
ISSN: 0028-646X
Identification Number - DOI: 10.1046/j.1469-8137.2003.00736.x
Additional Information:

The definitive version is available at www.blackwell-synergy.com

Date Deposited: 30 Nov 2007 03:29
Last Modified: 18 Nov 2014 03:25
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