BackgroundDehydrins are known as Group II late embryogenesis abundant proteins. Their high hydrophilicity and thermostability suggest that they may be structure stabilizers with detergent and chaperone-like properties. They are localised in the nucleus, cytoplasm, and plasma membrane. We have recently found putative dehydrins in the mitochondria of some cereals in response to cold. It is not known whether dehydrin-like proteins accumulate in plant mitochondria in response to stimuli other than cold stress.ResultsWe have found five putative dehydrins in the mitochondria of winter wheat, rye and maize seedlings. Two of these polypeptides had the same molecular masses in all three species (63 and 52 kD) and were thermostable. Drought, freezing, cold, and exogenous ABA treatment led to higher accumulation of dehydrin-like protein (dlp) 63 kD in the rye and wheat mitochondria. Protein 52 kD was induced by cold adaptation and ABA. Some accumulation of these proteins in the maize mitochondria was found after cold exposition only. The other three proteins appeared to be heat-sensitive and were either slightly induced or not induced at all by all treatments used.ConclusionsWe have found that, not only cold, but also drought, freezing and exogenous ABA treatment result in accumulation of the thermostable dehydrins in plant mitochondria. Most cryotolerant species such as wheat and rye accumulate more heat-stable dehydrins than cryosensitive species such as maize. It has been supposed that their function is to stabilize proteins in the membrane or in the matrix. Heat-sensitive putative dehydrins probably are not involved in the stress reaction and adaptation of plants.
Accumulation of dehydrin-like proteins in the mitochondria of cereals in response to cold, freezing, drought and ABA treatment
G. Borovskii,I. Stupnikova,A. Antipina,S. V. Vladimirova,V. Voinikov
Published 2002 in BMC Plant Biology
ABSTRACT
PUBLICATION RECORD
- Publication year
2002
- Venue
BMC Plant Biology
- Publication date
2002-06-11
- Fields of study
Biology, Medicine, Environmental Science
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
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CLAIMS
CONCEPTS
- abiotic stress treatments
The environmental and hormonal treatments applied to seedlings, including drought, freezing, cold, cold adaptation, and exogenous ABA.
Aliases: drought, freezing, cold, cold adaptation, ABA treatment, abscisic acid treatment
- dehydrin-like proteins
A class of highly hydrophilic, thermostable proteins related to Group II late embryogenesis abundant proteins in cereal mitochondria.
Aliases: dehydrins, dehydrin-like protein
- dlp 52 kd
A 52 kilodalton dehydrin-like polypeptide detected in cereal mitochondria.
Aliases: 52 kD dlp, 52 kD protein
- dlp 63 kd
A 63 kilodalton dehydrin-like polypeptide detected in cereal mitochondria.
Aliases: 63 kD dlp, 63 kD protein
- maize seedlings
Seedlings of maize used as the cryosensitive cereal comparison in the mitochondrial assays.
Aliases: maize, corn seedlings
- plant mitochondria
The mitochondrial compartment in cereal seedlings where the dehydrin-like polypeptides were examined.
Aliases: mitochondria, mitochondrial compartment
- rye
A cold-tolerant cereal species examined for mitochondrial dehydrin-like protein accumulation.
Aliases: rye seedlings
- thermostable dehydrin-like polypeptides
Dehydrin-like proteins that retain stability after heat treatment, corresponding to the proteins reported at 63 kD and 52 kD.
Aliases: heat-stable dehydrin-like proteins, thermostable dehydrins
- winter wheat
A cold-tolerant wheat species included as one of the cereal seedling sources in the experiment.
Aliases: wheat
REFERENCES
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