Metabolic activity of plant mitochondria in hypertonic sucrose solutions

Metabolic activity of plant mitochondria in hypertonic sucrose solutions This study deals with effects of hypertonic sucrose solutions on respiration and oxidative phosphorylation of intact mitochondria isolated from sugar beet (Beta vulgaris L.) taproots and etiolated pea (Pisum sativum L.) seedlings. Mitochondria from plants, like those of animals, showed a trend to inhibition of oxidative phosphorylation in hypertonic sucrose solutions. The increase in sucrose concentration from 0.5 to 1.0 M suppressed malate oxidation in the presence of glutamate in state 3 by a factor of 2.5–3.5 and diminished the respiratory control ratio by a factor of 1.5–2.0. Plant mitochondria turned out remarkably resistant to osmotic stress; they retained significant respiratory control and high ADP/O ratios in a hypertonic 1 M sucrose solution. Although the origin of the observed phenomenon remains unresolved and warrants further studies, it is evident that elevated resistance of plant mitochondria to osmotic stress might be significant for energy supply under extreme environmental conditions (upon drought and salinity) when the plant organism experiences dehydration with a concomitant increase in the cytoplasmic osmolarity. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Metabolic activity of plant mitochondria in hypertonic sucrose solutions

Loading next page...
 
/lp/springer_journal/metabolic-activity-of-plant-mitochondria-in-hypertonic-sucrose-WRD96pQwMg
Publisher
SP MAIK Nauka/Interperiodica
Copyright
Copyright © 2008 by MAIK Nauka
Subject
Life Sciences; Plant Sciences ; Plant Physiology
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1134/S1021443708030084
Publisher site
See Article on Publisher Site

Abstract

This study deals with effects of hypertonic sucrose solutions on respiration and oxidative phosphorylation of intact mitochondria isolated from sugar beet (Beta vulgaris L.) taproots and etiolated pea (Pisum sativum L.) seedlings. Mitochondria from plants, like those of animals, showed a trend to inhibition of oxidative phosphorylation in hypertonic sucrose solutions. The increase in sucrose concentration from 0.5 to 1.0 M suppressed malate oxidation in the presence of glutamate in state 3 by a factor of 2.5–3.5 and diminished the respiratory control ratio by a factor of 1.5–2.0. Plant mitochondria turned out remarkably resistant to osmotic stress; they retained significant respiratory control and high ADP/O ratios in a hypertonic 1 M sucrose solution. Although the origin of the observed phenomenon remains unresolved and warrants further studies, it is evident that elevated resistance of plant mitochondria to osmotic stress might be significant for energy supply under extreme environmental conditions (upon drought and salinity) when the plant organism experiences dehydration with a concomitant increase in the cytoplasmic osmolarity.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: May 15, 2008

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve Freelancer

DeepDyve Pro

Price
FREE
$49/month

$360/year
Save searches from
Google Scholar,
PubMed
Create lists to
organize your research
Export lists, citations
Read DeepDyve articles
Abstract access only
Unlimited access to over
18 million full-text articles
Print
20 pages/month
PDF Discount
20% off