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Grodzinski B, Jiao J, Knowles VL, et al. Photosynthesis and carbon partitioning in transgenic tobacco plants deficient in leaf cytosolic pyruvate kinase . Plant Physiol. 1999;120(3):887-96doi: 10.1104/pp.120.3.887.
Grodzinski, B., Jiao, J., Knowles, V. L., & Plaxton, W. C. (1999). Photosynthesis and carbon partitioning in transgenic tobacco plants deficient in leaf cytosolic pyruvate kinase . Plant physiology, 120(3), 887-96. https://doi.org/10.1104/pp.120.3.887
Grodzinski, et al. "Photosynthesis and carbon partitioning in transgenic tobacco plants deficient in leaf cytosolic pyruvate kinase ." Plant physiology vol. 120,3 (1999): 887-96. doi: https://doi.org/10.1104/pp.120.3.887
Grodzinski B, Jiao J, Knowles VL, Plaxton WC. Photosynthesis and carbon partitioning in transgenic tobacco plants deficient in leaf cytosolic pyruvate kinase . Plant Physiol. 1999 Jul;120(3):887-96. doi: 10.1104/pp.120.3.887. PMID: 10398725; PMCID: PMC59328.
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Plant Physiol. 1999 Jul;120(3):887-96. doi: 10.1104/pp.120.3.887.

Photosynthesis and carbon partitioning in transgenic tobacco plants deficient in leaf cytosolic pyruvate kinase .

Plant physiology

Grodzinski, Jiao, Knowles, Plaxton

Affiliations

  1. Department of Plant Agriculture, University of Guelph, Guelph, Ontario, Canada N1G 2W1 (B.G., J.J.).

PMID: 10398725 PMCID: PMC59328 DOI: 10.1104/pp.120.3.887

Abstract

Whole-plant diurnal C exchange analysis provided a noninvasive estimation of daily net C gain in transgenic tobacco (Nicotiana tabacum L.) plants deficient in leaf cytosolic pyruvate kinase (PKc-). PKc- plants cultivated under a low light intensity (100 &mgr;mol m-2 s-1) were previously shown to exhibit markedly reduced root growth, as well as delayed shoot and flower development when compared with plants having wild-type levels of PKc (PKc+). PKc- and PKc+ source leaves showed a similar net C gain, photosynthesis over a range of light intensities, and a capacity to export newly fixed 14CO2 during photosynthesis. However, during growth under low light the nighttime, export of previously fixed 14CO2 by fully expanded PKc- leaves was 40% lower, whereas concurrent respiratory 14CO2 evolution was 40% higher than that of PKc+ leaves. This provides a rationale for the reduced root growth of the PKc- plants grown at low irradiance. Leaf photosynthetic and export characteristics in PKc- and PKc+ plants raised in a greenhouse during winter months resembled those of plants grown in chambers at low irradiance. The data suggest that PKc in source leaves has a critical role in regulating nighttime respiration particularly when the available pool of photoassimilates for export and leaf respiratory processes are low.

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