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Metabolic response of potato plants to an antisense reduction of the P-protein of glycine decarboxylase
Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).ORCID iD: 0000-0001-5900-7395
2001 (English)In: Planta, ISSN 0032-0935, E-ISSN 1432-2048, Vol. 212, no 5-6, 880-887 p.Article in journal (Refereed) Published
Abstract [en]

Potato (Solanum tuberosum L. cv. Desire) plants with reduced amounts of P-protein, one of the subunits of glycine decarboxylase (GDC), have been generated by introduction of an antisense transgene. Two transgenic lines, containing about 60-70% less P-protein in the leaves compared to wild-type potato, were analysed in more detail. The reduction in P-protein amount led to a decrease in the ability of leaf mitochondria to decarboxylate glycine. Photosynthetic and growth rates were reduced but the plants were viable under ambient air and produced tubers. Glycine concentrations within the leaves were elevated up to about 100-fold during illumination. Effects: on other amino acids and on sucrose and hexoses were minor. Nearly all of the glycine accumulated during the day was metabolised during the following night. The data suggest that the GDC operates far below substrate saturation under normal conditions thus allowing a flexible and fast response to changes in the environment.

Place, publisher, year, edition, pages
2001. Vol. 212, no 5-6, 880-887 p.
Keyword [en]
antisense effects, glycine decarboxylase, photorespiration, photosynthesis, Solanum (glycine decarboxylase), transgenic potato
URN: urn:nbn:se:umu:diva-44659ISI: 000168399700029OAI: diva2:434111
Available from: 2011-08-12 Created: 2011-06-09 Last updated: 2015-04-29

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Gardeström, Per
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