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Madore M, Grodzinski B. Effect of Oxygen Concentration on C-Photoassimilate Transport from Leaves of Salvia splendens L. Plant Physiol. 1984;76(3):782-6doi: 10.1104/pp.76.3.782.
Madore, M., & Grodzinski, B. (1984). Effect of Oxygen Concentration on C-Photoassimilate Transport from Leaves of Salvia splendens L. Plant physiology, 76(3), 782-6. https://doi.org/10.1104/pp.76.3.782
Madore, M, and Grodzinski, B. "Effect of Oxygen Concentration on C-Photoassimilate Transport from Leaves of Salvia splendens L." Plant physiology vol. 76,3 (1984): 782-6. doi: https://doi.org/10.1104/pp.76.3.782
Madore M, Grodzinski B. Effect of Oxygen Concentration on C-Photoassimilate Transport from Leaves of Salvia splendens L. Plant Physiol. 1984 Nov;76(3):782-6. doi: 10.1104/pp.76.3.782. PMID: 16663924; PMCID: PMC1064373.
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Plant Physiol. 1984 Nov;76(3):782-6. doi: 10.1104/pp.76.3.782.

Effect of Oxygen Concentration on C-Photoassimilate Transport from Leaves of Salvia splendens L.

Plant physiology

M Madore, B Grodzinski

Affiliations

  1. Department of Horticultural Science, University of Guelph, Guelph, Ontario N1G 2W1 Canada.

PMID: 16663924 PMCID: PMC1064373 DOI: 10.1104/pp.76.3.782

Abstract

Partitioning and transport of recently fixed photosynthate was examined following (14)CO(2) pulse-labeling of intact, attached leaves of Salvia splendens L. maintained in an atmosphere of 300 microliters per liter CO(2) and 20, 210, or 500 milliliters per liter O(2). Under conditions of increasing O(2) (210, 500 milliliters per liter), a smaller percentage of the recently fixed (14)C in the leaf was allocated to starch, whereas a greater percentage of the fixed (14)C appeared in amino acids, particularly serine. The increase in (14)C in amino acids was reflected in material exported from source leaves. A higher percentage of (14)C in serine, glycine, and glutamate was recovered in petiole extracts when source leaves were maintained under elevated O(2) levels. Although pool sizes of these amino acids were increased in both the leaves and petioles with increasing photorespiratory activity, no significant changes in either (14)C distribution or concentration of transport sugars (i.e. stachyose, sucrose, verbascose) were observed. The data indicate that, in addition to being recycled intracellularly into Calvin cycle intermediates, amino acids produced during photorespiration may also serve as transport metabolites, allowing the mobilization of both carbon and nitrogen from the leaf under conditions of limited photosynthesis.

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