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Photosynthesis and Carbon Partitioning in Transgenic Tobacco Plants Deficient in Leaf Cytosolic Pyruvate Kinase1
Open accessAbstract
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 μmol 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 respiratory14CO2 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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“For example, analysis of transgenic tobacco (Nicotiana tabacum) with reduced cytosolic pyruvate kinase showed that the main role of this enzyme in leaves is associated with nocturnal respiration (Grodzinski et al., 1999).”
From Leaf Energy Balance Requires Mitochondrial Respiration and Export of Chloroplast NADPH in the Light (2019) · cites this paper as Grodzinski et al., 1999
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Cited by
Leaf Energy Balance Requires Mitochondrial Respiration and Export of Chloroplast NADPH in the Light
Shameer, S., Ratcliffe, R. G., & Sweetlove, L. J. (2019) · Plant Physiology · doi:10.1104/pp.19.00624 · Cited by 118
Metadata
- Authors
- Grodzinski, B., Jiao, J., Knowles, V. L., & Plaxton, W. C.
- Affiliations
- University of Guelph (CA)
- Departments of Biology (V.L.K., W.C.P.)
- Queen's University (CA)
- Venue
- Plant Physiology
- Publisher
- Oxford University Press (OUP)
- Published
- 1999-07-01
- Volume
- 120
- Issue
- 3
- Pages
- 887-896
- ISSN
- 0032-0889 (ISSN-L)
- 1532-2548
- PMC
- PMC59328
- OpenAlex
- W2112837924
- Cited by
- 47
- References
- 1
- Citations by year
- 2026: 2 · 2025: 2 · 2022: 2 · 2021: 2 · 2020: 2 · 2019: 1 · 2018: 2 · 2017: 1 · 2016: 1 · 2015: 2 · 2014: 2 · 2013: 3 · 2012: 2
- FWCI
- 0.81
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model (vor)
- Locations
- PLANT PHYSIOLOGY (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Natural Sciences and Engineering Research Council of Canada
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant nutrient uptake and metabolism
- Physical Sciences › Environmental Science › Global and Planetary Change › Plant Water Relations and Carbon Dynamics
- Keywords
- carbon allocation, photosynthesis, transgenic tobacco, nighttime respiration, low-light conditions, root growth
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- The paper
- Grodzinski, B., Jiao, J., Knowles, V. L., & Plaxton, W. C. (1999). Photosynthesis and Carbon Partitioning in Transgenic Tobacco Plants Deficient in Leaf Cytosolic Pyruvate Kinase1. Plant Physiology. https://doi.org/10.1104/pp.120.3.887
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Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
