Navigation Links
Core mechanism for root growth identified
Date:8/25/2014

During plant growth, dividing cells in meristems must coordinate transitions from division to expansion and differentiation. Three distinct developmental zones are generated: the meristem, where the cell division takes place, and elongation and differentiation zones. At the same time, plants can rapidly adjust their direction of growth to adapt to environmental conditions.

In Arabidopsis roots, many aspects of zonation are controlled by the plant hormone auxin and auxin-induced PLETHORA transcription factors. Both show a graded distribution with a maximum near the root tip. In addition, auxin is also pivotal for tropic responses of the roots.

Ari Pekka Mhnen with his group in the Institute of Biotechnology, University of Helsinki, Finland, and Dutch colleagues has now found out with the help of experimentation and mathematical modelling how the two factors together regulate root growth.

"Cell division in the meristem is maintained by PLETHORA transcription factors. These proteins are solely transcribed in the stem cells, in a narrow region within the meristematic cells located in the tip of the root. So PLETHORA proteins are most abundant in the stem cells," Ari Pekka Mhnen says.

Outside the stem cells the amount of PLETHORA protein in the cells halves each time the cells divide. In the end there is so little PLETHORA left in the cells that they cannot stay in the dividing mode. This is when the cells start to elongate and differentiate.

Auxin is the factor taking care of many aspects of root growth. If there is enough PLETHORA in the root cells, auxin affects the rate of root cell division. If there is little or no PLETHORA in the cells, auxin regulates cell differentiation and elongation. In addition to this direct, rapid regulation, auxin also regulates cell division, expansion and differentiation indirectly and slowly by promoting PLETHORA transcription. This dual action of auxin keeps the structure and g
'/>"/>

Contact: Ari Pekka Mähönen
aripekka.mahonen@helsinki.fi
University of Helsinki
Source:Eurekalert  

Page: 1 2

Related biology news :

1. UMN and NYBC research finds potential MERS transmission mechanism between bats and humans
2. Scientists discover biochemical mechanisms contributing to fibromuscular dysplasia
3. Scientists discover new, noncommittal mechanism of drug resistance
4. Molecular mechanisms underlying the prevention of autoim-munity by Roquin revealed
5. Novel type of bird pollination mechanism discovered in South America
6. New technology reveals insights into mechanisms underlying amyloid diseases
7. Mechanism that prevents lethal bacteria from causing invasive disease is revealed
8. New from Garland Science -- now available: Cell Signaling: Principles and Mechanisms
9. The colon has a safety mechanism that restricts tumor formation
10. Researchers develop genetic control mechanism for major livestock pest
11. LSTM researchers identify the complex mechanisms controlling changes in snake venom
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Core mechanism for root growth identified
(Date:10/18/2014)... with undiagnosed, suspected genetic conditions, a certain type of ... diagnostic yield than traditional molecular diagnostic methods, according to ... is being released to coincide with the American Society ... sequences the protein­coding region of the genome (the complete ... cell or organism), has been rapidly applied in research ...
(Date:10/17/2014)... from the University of Copenhagen have shown for the ... lungs of Cystic fibrosis patients, giving them the opportunity ... in chronic infections. , The study also discovered the ... (CF) patients was halted or slowed down by the ... all the oxygen and helped "suffocate" the bacteria, forcing ...
(Date:10/16/2014)... Virginia Institute of Marine Science have received a ... to identify the streams and wetlands most vulnerable ... help local governments and citizens conserve these important ... dataset of tidal-marsh observations first gathered by VIMS ... baseline can today,s researchers accurately map the slow ...
Breaking Biology News(10 mins):Study examines type of exome sequencing and molecular diagnostic yield 2Study examines type of exome sequencing and molecular diagnostic yield 3Scientists opens black box on bacterial growth in cystic fibrosis lung infection 2EPA grant will help localities conserve headwater wetlands 2EPA grant will help localities conserve headwater wetlands 3
... (February 28, 2012) Abstracts are now being accepted ... Infectious Diseases Society of America (IDSA), the Society for ... (HIVMA), and the Pediatric Infectious Diseases Society (PIDS). ... 17-21, 2012, in San Diego, CA. With the theme ...
... a world-leading provider of scientific, technical and medical ... scientist, Professor Dr. Manfred T. Reetz (Emeritus) of ... Professor at Philipps-Universitt, Marburg, has been awarded the ... Organic Chemistry. The Executive Board of ...
... from The University of Nottingham have demonstrated how a ... potentially immortal. The discovery, published in the ... part of a project funded by the Biotechnology and ... (MRC) and may shed light on the possibilities of ...
Cached Biology News:Leading German Researcher awarded Elsevier's 2011 Tetrahedron Prize 2Immortal worms defy aging 2Immortal worms defy aging 3
(Date:10/22/2014)... and BOSTON , Oct. ... ), a leading global specialty pharmaceutical company, and Rhythm, ... granted an exclusive option to acquire Rhythm,s wholly owned ... a peptide ghrelin agonist, for the treatment of diabetic ... Rhythm has completed a successful Phase 2 trial of ...
(Date:10/22/2014)... 22, 2014 Involution Studios , ... of a new infographic, Understanding Ebola . ... beautifully designed, easy to follow informative tool for anyone ... outbreak, symptoms and prevention. , "As the news has ... 2014 Ebola outbreak represents not only a healthcare crisis ...
(Date:10/22/2014)... Rock Hill, SC (PRWEB) October 22, 2014 ... the expansion of its cardiovascular pharmacogenetics menu, which ... improved patient outcomes. With PCLS’s evidence-based results, ... individual needs and optimize their therapy, while minimizing ... , In the U.S., according to the FDA ...
(Date:10/22/2014)... NEW YORK , Oct. 22, 2014 ... Diabetes Federation, approximately 400 million people worldwide are living ... 552 million people by 2030.  The global market for ... In 2012 approximately 330,000 people worldwide died from pancreatic ... of death due to cancer in the ...
Breaking Biology Technology:Actavis Signs Option to Acquire Rhythm Subsidiary and its GI Development Product, Relamorelin 2Actavis Signs Option to Acquire Rhythm Subsidiary and its GI Development Product, Relamorelin 3Actavis Signs Option to Acquire Rhythm Subsidiary and its GI Development Product, Relamorelin 4Actavis Signs Option to Acquire Rhythm Subsidiary and its GI Development Product, Relamorelin 5Involution Studios' Ebola Infographic Provides Key Disease Information and Statistics at a Glance 2PCLS Announces Expansion of Cardiovascular Pharmacogenetic Testing Menu 2PCLS Announces Expansion of Cardiovascular Pharmacogenetic Testing Menu 3Nuvilex Brief Analyst Report: Thinking Outside the Box by BrokerBank Securities, Inc. 2
... Contributed by James V. Anderson and Charles L. Guy, The,University of Florida, Institute ... Introduction , ... , Glucose Regulated Proteins) are ER-luminal proteins ... 1 BiPs are associated with the transport and folding process , ...
... Contributed by Alan T. Bakalinsky Department of Food Science and Technology, ... , Abstract , ... cerevisiae were , compared to those of ... supported previous genetic findings that two of the wine strains are aneuploid , ...
... Marie Nguyen and William Strong, Bio-Rad Laboratories, Inc.,6000 James ... , Introduction , ... is an established technique employed for protein separation. However, ... manual steps and several , hours to ...
Cached Biology Technology:A Rapid Method for the Purification of Analytical Grade Proteins From Plants Using Preparative SDS-PAGE and Preparative IEF 2A Rapid Method for the Purification of Analytical Grade Proteins From Plants Using Preparative SDS-PAGE and Preparative IEF 3A Rapid Method for the Purification of Analytical Grade Proteins From Plants Using Preparative SDS-PAGE and Preparative IEF 4A Rapid Method for the Purification of Analytical Grade Proteins From Plants Using Preparative SDS-PAGE and Preparative IEF 5Electrophoretic Karyotypes of Wine Strains of Saccharomyces cerevisiae 2Electrophoretic Karyotypes of Wine Strains of Saccharomyces cerevisiae 3Electrophoretic Karyotypes of Wine Strains of Saccharomyces cerevisiae 4Electrophoretic Karyotypes of Wine Strains of Saccharomyces cerevisiae 5Electrophoretic Karyotypes of Wine Strains of Saccharomyces cerevisiae 6Performance Comparison of the Experion Automated Electrophoresis System and a Competing Automated System for Protein Analysis, Rev A 2Performance Comparison of the Experion Automated Electrophoresis System and a Competing Automated System for Protein Analysis, Rev A 3Performance Comparison of the Experion Automated Electrophoresis System and a Competing Automated System for Protein Analysis, Rev A 4Performance Comparison of the Experion Automated Electrophoresis System and a Competing Automated System for Protein Analysis, Rev A 5Performance Comparison of the Experion Automated Electrophoresis System and a Competing Automated System for Protein Analysis, Rev A 6Performance Comparison of the Experion Automated Electrophoresis System and a Competing Automated System for Protein Analysis, Rev A 7Performance Comparison of the Experion Automated Electrophoresis System and a Competing Automated System for Protein Analysis, Rev A 8Performance Comparison of the Experion Automated Electrophoresis System and a Competing Automated System for Protein Analysis, Rev A 9Performance Comparison of the Experion Automated Electrophoresis System and a Competing Automated System for Protein Analysis, Rev A 10Performance Comparison of the Experion Automated Electrophoresis System and a Competing Automated System for Protein Analysis, Rev A 11Performance Comparison of the Experion Automated Electrophoresis System and a Competing Automated System for Protein Analysis, Rev A 12Performance Comparison of the Experion Automated Electrophoresis System and a Competing Automated System for Protein Analysis, Rev A 13
... preparations are prepared from customers high-copy ... to multi-gram scales. Each preparation is ... glycerol stocks are maintained to facilitate ... (Clonal selection includes screening colonies for ...
... channels for automated gigaseal patch clamping. ... voltage-gated ion channels, such as hERG and ... The four pipette heads afford more efficient ... drug discovery. The glass-coated tunnels of ...
... be able to handle larger sample volumes, automate ... as interface with telemetry systems. The AccuSampler ... dogs, pigs, and primates. The system may ... the computer can be located outside the animal ...
... The GST•Tag™ Antibody Plate is ... GST•Tag Monoclonal Antibody. This antibody (mouse ... S. japonicum glutathione-S-transferase (GST), ... virtually any GST•Tag fusion protein in ...
Biology Products: