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Plant mitochondrial function during anaerobiosis
Abir U Igamberdiev1, Robert D Hill
1Department of Biology, Memorial University of Newfoundland, St John's, NL, Canada, A1B 3X9.
Annals of Botany
|July 1, 2008
Summary
Plant mitochondria maintain energy production and metabolite balance during hypoxia by utilizing nitrite. This process involves nitric oxide scavenging and shifts metabolic pathways to support cell survival under anoxia.
Area of Science:
- Plant physiology
- Mitochondrial respiration
- Hypoxia response
Background:
- Plant mitochondria oxidize external NADH, NADPH, and TCA cycle substrates under hypoxia.
- Nitrite acts as an alternative electron acceptor, involving cytochrome oxidase, complex III, and alternative oxidase.
- Nitric oxide (NO) inhibits cytochrome c oxidase; excess NO is scavenged by hypoxically induced haemoglobin.
Purpose of the Study:
- To investigate the role of mitochondrial metabolism in plant anoxia survival.
- To explore the function of nitrite as an alternative electron acceptor in plant mitochondria.
- To understand the metabolic shifts occurring in plant cells under hypoxic conditions.
Main Methods:
- Mitochondrial electron transport chain activity under hypoxic conditions.
- Analysis of metabolite composition, including pyruvate, alanine, and gamma-aminobutyric acid.
- Investigation of ATP synthesis capacity using nitrite.
Main Results:
- Mitochondria retain limited ATP synthesis capacity when using nitrite.
- NADH oxidation shifts anaerobic metabolism, increasing pyruvate to alanine conversion.
- Increased involvement of transamination reactions, including gamma-aminobutyric acid formation.
Conclusions:
- Mitochondrial metabolism plays a crucial role in alleviating anoxia effects in plant cells.
- Further research is needed to fully understand mitochondrial carbon and nitrogen metabolism under anoxia.
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