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Books > Medicine > Pre-clinical medicine: basic sciences > Medical genetics
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Gene Conservation and Exploitation - 20th Stadler Genetics Symposium (Paperback, Softcover reprint of the original 1st ed. 1993)
Loot Price: R4,274
Discovery Miles 42 740
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Gene Conservation and Exploitation - 20th Stadler Genetics Symposium (Paperback, Softcover reprint of the original 1st ed. 1993)
Series: Stadler Genetics Symposia Series
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The potato (Solanum tuberosum L. ) tuber is a major food source in
many countries of the world, and subsequently potato has been the
target of a good deal of effort directed at engineering disease and
herbicide tolerance, and improvements in various crop
characteristics. Consequently investigations into the regulation of
gene expression in tubers is relevant to these endeavours, as
tubers are the main target organ for modification of gene
expression. We have been interested in the regulation of genes in
tubers for these reasons. Morphologically tubers are modified
stems, which have enlarged radially by limited cell division and
substantial expansion. At the molecular level, tuber development is
characterised by a massive increase in starch deposition and the
synthesis of a limited number of abundant proteins. These include
proteinase inhibitors and a 40kd group of proteins called patatin,
which are acyl hydrolases. Together these proteins account for over
50% of tuber proteins (reviewed by Bevan, 1991). The synthesis of
these proteins has parallels to the synthesis of other somatic
storage proteins, especially the VSP proteins of soybean. In both
potato and soybean, removal of the sink for these proteins (tubers
and pods, respectively) causes deposition in other tissues
(Staswick, 1990). It is hypothesised that transcriptional control
of the genes encoding these proteins is regulated in part by
source-sink relationships of metabolites or other factors. In the
case of VSPs, both amino acid levels and jasmonic acid play a major
regulatory role (Staswick et aI.
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