Navigation Links
Scientists unveil mechanism for 'up and down' in plants
Date:10/28/2008

Versatile hormone

It is known for a long time that the plant hormone auxin is transmitted from the top to the bottom of a plant, and that the local concentration of auxin is important for the growth direction of stems, the growth of roots, the sprouting of shoots. To name a few things; auxin is also relevant to, for instance, the ripening of fruit, the clinging of climbers and a series of other processes. Thousands of researchers try to understand the different roles of auxin.

In many instances the distribution of auxin in the plant plays a key role, and thus the transport from cell to cell. At the bottom of plant cells, so-called PIN proteins are located on the cell membrane, helping auxin to flow through to the lower cell. However, no one thoroughly understood why the PIN proteins only showed up at the bottom of a cell.

Endocytosis

An international group of scientists from labs in five countries, headed by Jir Friml of the VIB-department Plant Systems Biology at Ghent University, revealed a rather unusual mechanism. PIN proteins are made in the protein factories of the cell and are transported all over the cell membrane. Subsequently they are engulfed by the cell membrane, a process called endocytosis. The invagination closes to a vesicle, disconnects and moves back into the cell. Thus the PIN proteins are recycled and subsequently transported to the bottom of the cell, where they are again incorporated in the cell membrane. It is unclear why plants use such a complex mechanism, but a plausible explanation is this mechanism enables a quick reaction when plant cells feel a change of direction of gravity, giving them a new 'underside'.

Gene technology

To see the path of the protein, the researchers used gene technology to make cells in which the PIN protein was linked to fluorescent proteins. (This technology was rewarded with the Nobel Prize 2008 for chemistry.) Subsequently they produced cells in which the endocytosis was disrupted in two different ways. The PIN proteins showed up all over the cell membrane. When the researchers proceeded from single cells to plant embryos, the embryos developed deformations, because the pattern of auxin concentrations in the embryo was distorted. When these plants with disrupted endocytosis grew further, roots developed where the first leaflet should have been.


'/>"/>

Contact: Pieter Van Dooren
pieter.vandooren@vib.be
329-244-6611
VIB (the Flanders Institute for Biotechnology)
Source:Eurekalert

Related biology news :

1. Scientists identify cell changes leading to impaired artificial kidney function
2. Scientists achieve first tracking of salmon from headwaters in Rockies through Pacific to Alaska
3. NIAID scientists to speak on range of infectious disease topics at major scientific meeting
4. British scientists go cloud-hopping in the Pacific to improve climate predictions
5. Scientists map soils on an extinct American volcano
6. Scientists call for protected swimways for the endangered leatherback sea turtle
7. Scientists from Granada find a potential treatment to prevent diabetes and obesity
8. Scientists discover bacteria that can cause bone infections
9. Scientists propose the creation of a new type of seed bank
10. EMBO honors 59 leading life scientists
11. Caltech scientists engineer supersensitive receptor, gain better understanding of dopamine system
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/14/2016)... , April 14, 2016 ... Malware Detection, today announced the appointment of Eyal ... new role. Goldwerger,s leadership appointment comes at ... heels of the deployment of its platform at several ... biometric technology, which discerns unique cognitive and physiological factors, ...
(Date:3/23/2016)... , March 23, 2016 ... erhöhter Sicherheit Gesichts- und Stimmerkennung mit Passwörtern ... (NASDAQ: MESG ), ein führender ... das Unternehmen mit SpeechPro zusammenarbeitet, um erstmals ... Finanzdienstleistungsbranche, wird die Möglichkeit angeboten, im Rahmen ...
(Date:3/17/2016)... , March 17, 2016 ABI Research, ... forecasts the global biometrics market will reach more ... 118% increase from 2015. Consumer electronics, particularly smartphones, ... fingerprint sensors anticipated to reach two billion shipments ... Dimitrios Pavlakis , Research Analyst at ABI ...
Breaking Biology News(10 mins):
(Date:4/28/2016)... , April 28, 2016 The ... and Brayton Cryocoolers), Service (Technical Support, Product Repairs & ... - Global Forecast to 2022", published by MarketsandMarkets, the ... Billion by 2022, at a CAGR of 7.29% between ... data Tables and 94 Figures spread through 159 Pages ...
(Date:4/28/2016)... (PRWEB) , ... April 28, 2016 , ... ... made significant investments in recruiting top industry experts, and expanding its LATAM network ... provides industry-leading tools for clients to manage their clinical trial projects. , The ...
(Date:4/27/2016)... ... April 27, 2016 , ... The Pittcon Organizing Committee is pleased ... has been a volunteer member of Committee since 1987. Since then, he has served ... and treasurer and was chairman for both the program and exposition committees. In his ...
(Date:4/27/2016)... ... April 27, 2016 , ... The Board of ... appointment of John Tilton as Chief Commercial Officer.  Mr. Tilton joined Biohaven from ... founding commercial leaders responsible for the commercialization of multiple orphan drug indications. ...
Breaking Biology Technology: