Sonnewald U (1995)
Publication Status: Published
Publication Type: Journal article
Publication year: 1995
Publisher: OXFORD UNIV PRESS
Book Volume: 36
Pages Range: 615-624
Journal Issue: 4
In an attempt to study the importance of starch synthesis in leaves with respect to sink-source interactions, we investigated daily turnover of carbohydrates in leaves of transgenic potato plants inhibited for ADP-glucose pyrophosphorylase (AGPase). Down-regulation of AGPase has been performed using two different promoters: the near-constitutive CaMV 35S promoter, and the ST-LS1 promoter which is active in photosynthetic cells only. Residual AGPase activity in leaves was between 6 and 30% in individual transformants as compared to wild-type potato plants. We found that: (i) photosynthesis is not significantly altered relative to wild-type plants; (ii) levels of starch are markedly reduced in leaves of transgenic plants; (iii) levels of soluble sugars and malate are largely unaffected by the inhibition of AGPase; (iv) the reduction of starch synthesis leads to a higher portion of assimilated carbon being transported from leaves to sink tissues during the light period; (v) altered leaf export characteristics do not change tuber yield under greenhouse conditions. Collectively, these data demonstrate a striking flexibility of the potato plant with respect to day/night rhythms of carbon export from leaves and utilization by the major storage sinks, i.e. developing tubers.
APA:
Sonnewald, U. (1995). LEAF-SPECIFIC ANTISENSE INHIBITION OF STARCH BIOSYNTHESIS IN TRANSGENIC POTATO PLANTS LEADS TO AN INCREASE IN PHOTOASSIMILATE EXPORT FROM SOURCE LEAVES DURING THE LIGHT PERIOD. Plant and Cell Physiology, 36(4), 615-624.
MLA:
Sonnewald, Uwe. "LEAF-SPECIFIC ANTISENSE INHIBITION OF STARCH BIOSYNTHESIS IN TRANSGENIC POTATO PLANTS LEADS TO AN INCREASE IN PHOTOASSIMILATE EXPORT FROM SOURCE LEAVES DURING THE LIGHT PERIOD." Plant and Cell Physiology 36.4 (1995): 615-624.
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