Water-Transporting System in Higher Plants and Its Elements: 6. Relationship between Root Pressure and Transpiration in an Intact Plant

Water-Transporting System in Higher Plants and Its Elements: 6. Relationship between Root... Novel experimental data were adapted to a previously devised concept of water relations in plant roots. The improved concept explains the formation in the root stele of a high water potential that exceeds the water potential of the root environment. The physical basis of this phenomenon relies on active metabolism of the peripheral root zone (cortex) and, more importantly, on the unloading of assimilates from the root central cylinder (stele) to the outer cylinder (cortex). The unloading not only raises the water potential of the root stele but also increases the hydraulic resistance; these two factors account for the elevation of root pressure. The process of unloading assimilates from the root stele to the cortex is apparently promoted by the transit of the ascending water flow through the cortex. This flow, enriched with the dissolved oxygen of the root environment, stimulates the unloading and metabolic conversion of assimilates in the root symplast. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Water-Transporting System in Higher Plants and Its Elements: 6. Relationship between Root Pressure and Transpiration in an Intact Plant

Loading next page...
 
/lp/springer_journal/water-transporting-system-in-higher-plants-and-its-elements-6-s89k6n6r7S
Publisher
Kluwer Academic Publishers-Plenum Publishers
Copyright
Copyright © 2002 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1023/A:1020982100109
Publisher site
See Article on Publisher Site

Abstract

Novel experimental data were adapted to a previously devised concept of water relations in plant roots. The improved concept explains the formation in the root stele of a high water potential that exceeds the water potential of the root environment. The physical basis of this phenomenon relies on active metabolism of the peripheral root zone (cortex) and, more importantly, on the unloading of assimilates from the root central cylinder (stele) to the outer cylinder (cortex). The unloading not only raises the water potential of the root stele but also increases the hydraulic resistance; these two factors account for the elevation of root pressure. The process of unloading assimilates from the root stele to the cortex is apparently promoted by the transit of the ascending water flow through the cortex. This flow, enriched with the dissolved oxygen of the root environment, stimulates the unloading and metabolic conversion of assimilates in the root symplast.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Oct 13, 2004

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