Featured Research

from universities, journals, and other organizations

Tipping plant growth

Date:
December 19, 2011
Source:
Universitaet Tübingen
Summary:
The growth of multicellular organisms is fueled not only by cell division but also by cell growth. Normally cells enlarge all over the surface. However, in many organisms, there are also specialized cells that grow only at their tip. How the necessary materials are delivered to the growing tip, is largely unknown. A new study now suggests that tip growth is not mediated by targeted trafficking to the growing site of the cell surface but rather depends on a specific recycling pathway.

The growth of multicellular organisms is fuelled not only by cell division but also by cell growth. Normally cells enlarge all over the surface. However, in many organisms, there are also specialized cells that grow only at their tip. How the necessary materials are delivered to the growing tip, is largely unknown. A new study of a scientific team led by Dr. Sandra Richter and Prof. Gerd Jürgens from the Center for Plant Molecular Biology now suggests that tip growth is not mediated by targeted trafficking to the growing site of the cell surface but rather depends on a specific recycling pathway.

These results have just been published in Nature Cell Biology.

Cells usually grow by the fusion of small transport containers -- so-called membrane vesicles -- with the cell membrane. These vesicles are not only important for the expansion of the cell surface but also transport molecules to different destinations within the cell and out of the cell. These intracellular transport processes are crucial for the development and the well-being of organisms and are therefore tightly regulated. The research team of Prof. Gerd Jürgens from the University of Tübingen is studying the regulation of such trafficking pathways in the flowering plant Arabidopsis thaliana (mouse-ear cress). They mainly focus on a small group of proteins, so-called guanine-nucleotide exchange factors (ARF-GEF), that are crucial regulators of vesicle formation.

In their previous publications, the authors had shown that different intracellular trafficking pathways are regulated by different ARF-GEFs. The ARF-GEF GNOM, for example, mediates a specific polar recycling pathway that transports proteins back to the cell suface and is thus important for the development of Arabidopsis. Another essential trafficking pathway required in each cell is jointly regulated by GNOM and GNOM-LIKE1.

In the new publication, the closely related ARFGEF GNOM-LIKE2 was identified as an essential regulator of tip growth in pollen. Surprisingly, GNOM-LIKE2 is not only required for polar germination of the pollen grain but also for the tip growth of the pollen tube. Pollen tubes transport the sperm cells to the egg cells. Interestingly, GNOM-LIKE2 can replace GNOM in polar recycling. Thus, the polar recycling pathway is essential for tip growth. As GNOM-LIKE2 appears to have evolved with the origin of the flowering plants, its raison d´être might be its ability to support the fast growth of the pollen.


Story Source:

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


Journal Reference:

  1. Sandra Richter, Lena M. Müller, York-Dieter Stierhof, Ulrike Mayer, Nozomi Takada, Benedikt Kost, Anne Vieten, Niko Geldner, Csaba Koncz, Gerd Jürgens. Polarized cell growth in Arabidopsis requires endosomal recycling mediated by GBF1-related ARF exchange factors. Nature Cell Biology, 2011; DOI: 10.1038/ncb2389

Cite This Page:

Universitaet Tübingen. "Tipping plant growth." ScienceDaily. ScienceDaily, 19 December 2011. <www.sciencedaily.com/releases/2011/12/111219135023.htm>.
Universitaet Tübingen. (2011, December 19). Tipping plant growth. ScienceDaily. Retrieved October 22, 2014 from www.sciencedaily.com/releases/2011/12/111219135023.htm
Universitaet Tübingen. "Tipping plant growth." ScienceDaily. www.sciencedaily.com/releases/2011/12/111219135023.htm (accessed October 22, 2014).

Share This



More Plants & Animals News

Wednesday, October 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Cadaver Dogs Aid Search for More Victims of Suspected Indiana Serial Killer

Cadaver Dogs Aid Search for More Victims of Suspected Indiana Serial Killer

Reuters - US Online Video (Oct. 21, 2014) — Police in Gary, Indiana are using cadaver dogs to search for more victims after a suspected serial killer confessed to killing at least seven women. Linda So reports. Video provided by Reuters
Powered by NewsLook.com
White Lion Cubs Unveiled to the Public

White Lion Cubs Unveiled to the Public

Reuters - Light News Video Online (Oct. 21, 2014) — Visitors to Belgrade zoo meet a pair of three-week-old lion cubs for the first time. Tara Cleary reports. Video provided by Reuters
Powered by NewsLook.com
'Cadaver Dog' Sniffs out Human Remains

'Cadaver Dog' Sniffs out Human Remains

AP (Oct. 21, 2014) — Where's a body buried? Buster's nose can often tell you. He's a cadaver dog, specially trained to find human remains and increasingly being used by law enforcement and accepted in courts. These dogs are helping solve even decades-old mysteries. (Oct. 21) Video provided by AP
Powered by NewsLook.com
White Lion Cubs Born in Belgrade Zoo

White Lion Cubs Born in Belgrade Zoo

AFP (Oct. 20, 2014) — Two white lion cubs, an extremely rare subspecies of the African lion, were recently born at Belgrade Zoo. They are being bottle fed by zoo keepers after they were rejected by their mother after birth. Duration: 00:42 Video provided by AFP
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