Cited by 87Photosynthetic Processes and MechanismsPlant nutrient uptake and metabolismRedox biology and oxidative stress

The redox levels and subcellular distribution of pyridine nucleotides in illuminated barley leaf protoplasts studied by rapid fractionation

Wigge, Bosse, Krömer, Silke, Gardeström, Per·1993·Physiologia Plantarum

Abstract

The redox level and compartmentation of pyridine nucleotides was studied under photorespiratory and non‐photorespiratory conditions using rapid fractionation of barley (Hordeum vulgare L. cv. Gunilla, Svalöv) leaf protoplasts. From comparative measurements of the NADPH/NADP+ ratio and the ATP/ADP ratio one acidic and one alkaline extraction medium was chosen which quenched the metabolism very efficiently. The mitochondrial NADH/NAD+ was higher under photorespiratory conditions than under non‐photorespiratory conditions. Aminoacetonitrile, an inhibitor of the photorespiratory conversion of glycine to serine, lowered the mitochondrial NADH/NAD+ ratio. This supports the hypothesis that glycine oxidation is coupled to oxidative phosphorylation to provide ATP to the cytosol. The chloroplastic NADPH/NADP+ as well as the NADH/NAD+ ratios were quite stable in saturating and limiting CO2 as well as in the presence of aminoacetonitrile, although the triosephosphate/phosphoglycerate ratios changed. Thus, the redox level in the stroma seems to be tightly regulated.

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Crossref · 10.1111/j.1399-3054.1993.tb01754.x

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  • Addition of oligomycin to barley protoplasts decreased the ATP-ADP ratio in both mitochondria and cytosol, whereas the chloroplast ATP-ADP ratio was unchanged.

    “the addition of oligomycin to barley (Hordeum vulgare) protoplasts decreased the ATP-ADP ratio in both mitochondria and cytosol, whereas the chloroplast ATP-ADP ratio was unchanged (Gardeström and Wigge, 1988; Krömer and Heldt, 1991; Wigge et al., 1993).”

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Authors
Wigge, B., Krömer, S., & Gardeström, P.
Affiliations
Umeå University (SE)
Venue
Physiologia Plantarum
Publisher
Wiley
Published
1993-05
Volume
88
Issue
1
Pages
10-18
ISSN
  • 0031-9317 (ISSN-L)
  • 1399-3054
OpenAlex
W2045055386
Cited by
87
References
40
Citations by year
2025: 2 · 2024: 2 · 2023: 2 · 2022: 2 · 2021: 6 · 2020: 7 · 2019: 2 · 2018: 2 · 2017: 2 · 2016: 2 · 2015: 1 · 2014: 1 · 2013: 5 · 2012: 1
FWCI
0.89
Type
journal article
Language
en
Open access
closed
Locations
Physiologia Plantarum (publishedVersion)
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
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
pyridine nucleotides, redox state, subcellular compartmentalization, photorespiration, NADPH/NADP+ ratio, NAD+/NADH ratio, ATP/ADP ratio, mitochondrial NADH, chloroplast stroma, glycine oxidation, aminoacetonitrile, oxidative phosphorylation, CO2 limitation

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