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Pentose phosphate metabolism of potato tuber discs as influenced by prior storage temperature.

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Tubers of Solanum tuberosum L. var. Russet Burbank, Kennebec, and Targhee were stored at 95% relative humidity and at 1.7, 4.4, 5.8, 7.2 or 10 C. Rates of O(2) consumption were measured periodically by removing individual tubers from storage, excising discs of pith parenchyma tissue, and incubating

Chloroplast pentose-5-phosphate 3-epimerase from potato: cloning, cDNA sequence, and tissue-specific enzyme accumulation.

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A cDNA clone encoding the chloroplast enzyme pentose-5-phosphate 3-epimerase (EC 5.1.3.1) in potato (Solanum tuberosum) was isolated and sequenced. The deduced sequence of 235 amino acids is similar to protein sequences of bacterial epimerases. Northern blot analysis showed the highest level of

Utility of pentose colorimetric assay for the purification of potato lectin, an arabinose-rich glycoprotein.

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Potato lectin (Solanum tuberosum agglutinin, STA) is an unusual glycoprotein containing approximately 50% carbohydrates by weight. Of the total carbohydrates, 92% is contributed by L: -arabinose, which are O-linked to hydroxyproline residues. The ferric chloride-orcinol assay (Bial's test), which is

Pentose Phosphate Pathway as a Major Component of Induced Respiration of Carrot and Potato Slices.

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Comparison of defense responses of transgenic potato lines expressing three different Rpi genes to specific Phytophthora infestans races based on transcriptome profiling.

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Potato late blight, one of the most devastating diseases in potato, is caused by the oomycete Phytophthora infestans. Over 20 resistance genes have been cloned including R1, R3a, and R3b. The distinctions between defense response mechanisms mediated by different

[Enzyme activities and substrate levels of carbohydrate metabolism in proliferating and suberin synthesizing potato tuber cells].

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Isolation of tissue fragments from the potato tuber can initiate either periderm formation including suberin synthesis or cell proliferation without cicatrization effects. TCA-cycle activity has been shown to develop only in causal correlation with suberin synthesis (Lange, 1970). Biochemical

The response of carbohydrate metabolism in potato tubers to low temperature.

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This work investigates the possible causes of cold-induced sweetening in potato by examining the impact of low temperature on carbohydrate metabolism in mature tubers. Metabolism in tuber discs was monitored by determining the redistribution of radiolabel following incubation in [U-(14)C]glucose.

Structure and mechanism of the amphibolic enzyme D-ribulose-5-phosphate 3-epimerase from potato chloroplasts.

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Ribulose-5-phosphate 3-epimerase (EC 5.1.3.1) catalyzes the interconversion of ribulose-5-phosphate and xylulose-5-phosphate in the Calvin cycle and in the oxidative pentose phosphate pathway. The enzyme from potato chloroplasts was expressed in Escherichia coli, isolated and crystallized. The

Pathways of starch and sucrose biosynthesis in developing tubers of potato (Solanum tuberosum L.) and seeds of faba bean (Vicia faba L.) : Elucidation by (13)C-nuclear-magnetic-resonance spectroscopy.

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Tissue slices from developing potato tubers (Solanum tuberosum L.) and developing cotyledons of faba bean (Vicia faba L.) were incubated with specifically labelled [(13)C]glucose and [(13)C]ribose. Enriched[(13)C]glucose released from starch granules was analysed by nuclear magnetic resonance (NMR).

Structural studies of the carbohydrate moieties of lectins from potato (Solanum tuberosum) tubers and thorn-apple (Datura stramonium) seeds.

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1. Methylation analysis of potato (Solanum tuberosum) lectin and thorn-apple (Datura stramonium) lectin confirmed previous conclusions that both glycoproteins contained high proportions of l-arabinofuranosides and lesser amounts of d-galactopyranosides. The arabinofuranosides are present in both

Sugar response element enhances wound response of potato proteinase inhibitor II promoter in transgenic tobacco.

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The promoter region of the potato proteinase inhibitor II (PI-II) gene was studied to identify cis-acting regulatory sequences involved in sugar response using transgenic tobacco plants. The 5' control region covering an 892 nucleotide sequence upstream from the cap site and a 32 nucleotide

A study of the rate of recycling of triose phosphates in heterotrophic Chenopodium rubrum cells, potato tubers, and maize endosperm.

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We have investigated whether starch accumulation in heterotrophic cell-suspension cultures of Chenopodium rubrum L., developing potato (Solarium tuberosum L.) tubers or maize (Zea mays L.) endosperm involves import of triose phosphates or of hexose units into the plastid, and whether there is a

A rapid and effective method for purification of a heat-resistant lectin from potato (Solanum tuberosum) tubers.

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The potato lectin has been identified to consist of two chitin-binding modules, each containing twin hevein domains. Based on the thermotolerance of the hevein polypeptide, a simple, rapid, and effective protocol for the small-scale purification of the potato lectin has been developed in this study.

Analyzing the effect of decreasing cytosolic triosephosphate isomerase on Solanum tuberosum hairy root cells using a kinetic-metabolic model.

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A kinetic-metabolic model of Solanum tuberosum hairy roots is presented in the interest of understanding the effect on the plant cell metabolism of a 90% decrease in cytosolic triosephosphate isomerase (cTPI, EC 5.3.1.1) expression by antisense RNA. The model considers major metabolic pathways

Cloning and expression of transaldolase from potato.

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We have isolated a cDNA encoding transaldolase, an enzyme of the pentose-phosphate pathway, from potato (Solanum tuberosum). The 1.5 kb cDNA encodes a protein of 438 amino acid residues with a molecular mass of 47.8 kDa. When the potato cDNA was expressed in Escherichia coli a 45 kDa protein with

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