Dynamic changes in root hydraulic properties in response to nitrate availability

GLOSER, Vít, Maciej ZWIENIECKI, Colin ORIANS and Michelle HOLBROOK. Dynamic changes in root hydraulic properties in response to nitrate availability. Journal of Experimental Botany. 2007, vol. 58, No 7, p. 2409-2415. ISSN 0022-0957.

Basic information

• Original name: Dynamic changes in root hydraulic properties in response to nitrate availability
• Name in Czech: Dynamické změny hydraulických vlastností kořenů v reakci na dostupnost nitrátových iontů
• Authors: GLOSER, Vít (203 Czech Republic, guarantor), Maciej ZWIENIECKI (840 United States of America), Colin ORIANS (840 United States of America) and Michelle HOLBROOK (840 United States of America).
• Edition: Journal of Experimental Botany, 2007, 0022-0957.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 10600 1.6 Biological sciences
• Country of publisher: United Kingdom of Great Britain and Northern Ireland
• Confidentiality degree: is not subject to a state or trade secret
• Impact factor: Impact factor: 3.917
• RIV identification code: RIV/00216224:14310/07:00022982
• Organization unit: Faculty of Science
• UT WoS: 000250644400002
• Keywords in English: hydraulic resistance;nitrate;Helianthus anuus
• Tags: Helianthus anuus, hydraulic resistance, nitrate
• Tags: International impact, Reviewed

Abstract

We explored in detail changes in root hydraulic resistance in response to alterations in nitrate supply as a potential mechanism that allows plants to respond rapidly to changes in their environment. Sunflower (Helianthus anuus cv. Holiday) plants grown in hydroponics with limited nitrate availability served as our model. The response was rapid, with a decrease of about 20% occurring within the first hour after addition of 5mM nitrate. We also showed that the magnitude of this effect was dependent on nitrate concentration. The change in root hydraulic resistance was largely reversible, although the temporal dynamics of the response to nitrate addition versus nitrate withdrawal differed, raising the possibility that the underlying mechanisms may also differ. We present evidence that the observed changes in root hydraulic properties, presumably due to changes in the activity of aquaporins, are linked with a reduction in nitrate concentration in root cells. We propose that a rapid decrease in root hydraulic resistance in the presence of increased nitrate availability is an important trait that could enhance a plants ability to compete for nitrate in the soil.

Abstract (in Czech)

Změna hydraulických vlastností kořenů rostlin slunečnice po změně koncentrace nitrátů v okolí kořenů byla rychlá a pravděpodobně souvisí s asimilací nitrátů v buňkách.

Links

• 1P05ME793, research and development project: Name: Je tok vody klíčem k porozumění interakcím mezi rostlinami a půdním prostředí?

Investor: Ministry of Education, Youth and Sports of the CR, Roots, water, and the rhizosphere: Flushing out a new paradigm for belowground biology