Expansins: Proteins involved in cell wall softening during plant growth and morphogenesis

Expansins: Proteins involved in cell wall softening during plant growth and morphogenesis Expansins are a class of proteins first discovered as mediators of pH-dependent extension of primary cell walls. Structure, classification, activity, and functions of expansins are considered. Because of the lack of enzyme activity and owing to their reversible action on cell wall extensibility, expansins are assumed to disrupt hydrogen bonds between polysaccharides in cell walls strained mechanically by turgor pressure. Expansins are divided in four families: expansins A (EXPA), expansins B (EXPB), expansin-like proteins A, and expansin-like proteins B. Expansins A affect preferentially xyloglucan-rich type-I cell walls characteristic of dicotyledonous plants, whereas expansins B modify type-II cell walls, rich in arabinoxylans and β-glucans, characteristic of grasses. Each plant contains numerous genes coding for expansins. The transcription of these genes changes during plant growth and development and is controlled by phytohormones and environmental conditions. The most documented function of expansins is regulation of cell extension. Nevertheless, a slow retardation of growth during cell differentiation is apparently caused by the loss of cell wall sensitivity to expansins rather than by the decline in expansin activity. Expansins regulate the tip growth of root hairs and cottonseed hairs. The initiation of leaf primordia is related to local expression of expansin genes in the shoot apical meristem. Expansins are also needed for cell wall softening in ripening fruits, in the abscission zone, and in the pistil tissues. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Expansins: Proteins involved in cell wall softening during plant growth and morphogenesis

Loading next page...
 
/lp/springer_journal/expansins-proteins-involved-in-cell-wall-softening-during-plant-growth-gvbIvj0RBP
Publisher
Nauka/Interperiodica
Copyright
Copyright © 2007 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Plant Physiology; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1134/S1021443707060015
Publisher site
See Article on Publisher Site

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

Monthly Plan

  • Read unlimited articles
  • Personalized recommendations
  • No expiration
  • Print 20 pages per month
  • 20% off on PDF purchases
  • Organize your research
  • Get updates on your journals and topic searches

$49/month

Start Free Trial

14-day Free Trial

Best Deal — 39% off

Annual Plan

  • All the features of the Professional Plan, but for 39% off!
  • Billed annually
  • No expiration
  • For the normal price of 10 articles elsewhere, you get one full year of unlimited access to articles.

$588

$360/year

billed annually
Start Free Trial

14-day Free Trial