Journal of Experimental Botany, Vol 50, 735-743, Copyright © 1999 by Oxford University Press
A Kingston-Smith, R Walker and C Pollock
The distribution and activity of invertase in mature source leaves is
discussed in relation to the anabolic and catabolic processes that occur in
such tissues. Anomalously high levels of extractable activity are not, at
first sight, consistent with the perceived anabolic function of leaves. The
mechanisms of sucrose breakdown in leaves are discussed with particular
reference to the ways in which in vivo activity could
be modulated by factors such as product inhibition or developmental
control. The possible roles of invertase in leaves are discussed in
relation to (a) the metabolism of sucrose in heterotrophic tissues
(epidermis and vasculature); (b) sensing changes in assimilate abundance
and transducing these into altered patterns of gene expression and the
metabolism of oligosaccharides based upon sucrose. Evidence is presented
that indicates a significant degree of tissue-level compartmentation in the
activity of invertase.Keywords: Sucrose, leaves,
invertase, regulation, compartmentation.
ARTICLES
Review article. Invertase in leaves: conundrum or control point?
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberstywyth, SY23 3EB, UK; Department of Animal and Plant Sciences, The University of Sheffield, Sheffield, S10 2TN, UK; Corresponding author; Fax: +44 1970 820212; E-mail: Chris.Pollock@bbsrc.ac.uk
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