Featured Research

from universities, journals, and other organizations

Getting to the root of nutrient sensing

Date:
June 14, 2010
Source:
Cell Press
Summary:
New research reveals how plants modify their root architecture based on nutrient availability in the soil.

New research published by Cell Press in the June 15th issue of the journal Developmental Cell, reveals how plants modify their root architecture based on nutrient availability in the soil.

Related Articles


Plants obtain most necessary nutrients by taking them up from the soil into their roots. Although plants cannot move to a new environment when nutrient availability is less than favorable, they can modify their development to favor root colonization of soil areas where nutrients are abundant. Therefore, plants perceive the availability of external nutrients, like nitrogen, and couple this nutrient sensing to an appropriate adaptive response.

In Arabidopsis, the 'lab rat' of the plant world, lateral root growth is induced in nitrate-rich patches of soil. "Nitrate is the main nitrogen source for these plants and a signaling molecule that regulates growth and metabolism," explains senior study author Dr. Alain Gojon from the Plant Biochemistry and Molecular Physiology Department in Montpellier, France. "In Arabidopsis, the NRT1.1 nitrate transporter is crucial for nitrate signaling stimulating root growth."

Dr. Gojon's group was interested in investigating how NRT1.1-dependent stimulation of lateral root growth works. They discovered an unexpected connection between NRT1.1 and auxin, a plant hormone that plays a key role in root development. The researchers found that in addition to transporting nitrate, NRT1.1 also facilitates auxin transport. When external nitrate concentrations are low, NRT1.1 represses auxin accumulation in lateral roots and inhibits lateral root growth. A high nitrate concentration or disruption of the NRT1.1 gene suppresses NRT1.1-dependent auxin transport and auxin accumulates in lateral roots, which then grow out into the soil.

Taken together, the results indicate that NRT1.1 regulates root branching by exerting nitrate-dependent control of auxin accumulation in lateral roots. "We propose that NRT1.1 represses lateral root growth at low nitrate availability by promoting auxin transport out of lateral root tips and towards the base of the root. Thus, high nitrate availability stimulates lateral root growth by inhibiting NRT1.1-dependent auxin transport and allowing auxin accumulation in root tips," says Dr. Gojon. "This defines a mechanism connecting nutrient and hormone signaling during organ development."

The researchers include Gabriel Krouk, UMR 5004 CNRS/INRA/SupAgro-M/UM2, Institut de Biologie Integrative des Plantes, Montpellier, France; Benoiˆt Lacombe, UMR 5004 CNRS/INRA/SupAgro-M/UM2, Institut de Biologie Integrative des Plantes, Montpellier, France; Agnieszka Bielach, Ghent University, Gent, Belgium; Francine Perrine-Walker, UMR 5004 CNRS/INRA/SupAgro-M/UM2, Institut de Biologie Integrative des Plantes, Montpellier, France; Katerina Malinska, Academy of Sciences of the Czech Republic, Prague, Czech Republic; Emmanuelle Mounier, UMR 5004 CNRS/INRA/SupAgro-M/UM2, Institut de Biologie Integrative des Plantes, Montpellier, France; Klara Hoyerova, Academy of Sciences of the Czech Republic, Prague, Czech Republic; Pascal Tillard, UMR 5004 CNRS/INRA/SupAgro-M/UM2, Institut de Biologie Integrative des Plantes, Montpellier, France; Sarah Leon, UMR 5004 CNRS/INRA/SupAgro-M/UM2, Institut de Biologie Integrative des Plantes, Montpellier, France; Karin Ljung, Swedish University of Agricultural Sciences, Umea, Sweden; Eva Zazimalova, Academy of Sciences of the Czech Republic, Prague, Czech Republic; Eva Benkova, Ghent University, Gent, Belgium; Philippe Nacry, UMR 5004 CNRS/INRA/SupAgro-M/UM2, Institut de Biologie Integrative des Plantes, Montpellier, France; and Alain Gojon, UMR 5004 CNRS/INRA/SupAgro-M/UM2, Institut de Biologie Integrative des Plantes, Montpellier, France.


Story Source:

The above story is based on materials provided by Cell Press. Note: Materials may be edited for content and length.


Journal Reference:

  1. Gabriel Krouk, Benoξt Lacombe, Agnieszka Bielach, Francine Perrine-Walker, Katerina Malinska, Emmanuelle Mounier, Klara Hoyerova, Pascal Tillard, Sarah Leon, Karin Ljung, Eva Zazimalova, Eva Benkova, Philippe Nacry, Alain Gojon. Nitrate-Regulated Auxin Transport by NRT1.1 Defines a Mechanism for Nutrient Sensing in Plants. Developmental Cell, 2010; 18 (6): 927-937 DOI: 10.1016/j.devcel.2010.05.008

Cite This Page:

Cell Press. "Getting to the root of nutrient sensing." ScienceDaily. ScienceDaily, 14 June 2010. <www.sciencedaily.com/releases/2010/06/100614121600.htm>.
Cell Press. (2010, June 14). Getting to the root of nutrient sensing. ScienceDaily. Retrieved October 26, 2014 from www.sciencedaily.com/releases/2010/06/100614121600.htm
Cell Press. "Getting to the root of nutrient sensing." ScienceDaily. www.sciencedaily.com/releases/2010/06/100614121600.htm (accessed October 26, 2014).

Share This



More Plants & Animals News

Sunday, October 26, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Deep Sea 'mushroom' Could Be Early Branch on Tree of Life

Deep Sea 'mushroom' Could Be Early Branch on Tree of Life

Reuters - Innovations Video Online (Oct. 24, 2014) — Miniature deep sea animals discovered off the Australian coast almost three decades ago are puzzling scientists, who say the organisms have proved impossible to categorise. Academics at the Natural History of Denmark have appealed to the world scientific community for help, saying that further information on Dendrogramma enigmatica and Dendrogramma discoides could answer key evolutionary questions. Jim Drury has more. Video provided by Reuters
Powered by NewsLook.com
Black Bear Cub Goes Sunday Shopping

Black Bear Cub Goes Sunday Shopping

Reuters - Light News Video Online (Oct. 23, 2014) — Price check on honey? Bear cub startles Oregon drugstore shoppers. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Dances With Wolves in China's Wild West

Dances With Wolves in China's Wild West

AFP (Oct. 23, 2014) — One man is on a mission to boost the population of wolves in China's violence-wracked far west. The animal - symbol of the Uighur minority there - is under threat with a massive human resettlement program in the region. Duration: 00:41 Video provided by AFP
Powered by NewsLook.com
Breakfast Debate: To Eat Or Not To Eat?

Breakfast Debate: To Eat Or Not To Eat?

Newsy (Oct. 23, 2014) — Conflicting studies published in the same week re-ignited the debate over whether we should be eating breakfast. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins