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 July 28, 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 July 28, 2014).

Share This




More Plants & Animals News

Monday, July 28, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Deadly Ebola Virus Threatens West Africa

Deadly Ebola Virus Threatens West Africa

AP (July 28, 2014) — West African nations and international health organizations are working to contain the largest Ebola outbreak in history. It's one of the deadliest diseases known to man, but the CDC says it's unlikely to spread in the U.S. (July 28) Video provided by AP
Powered by NewsLook.com
Traditional African Dishes Teach Healthy Eating

Traditional African Dishes Teach Healthy Eating

AP (July 28, 2014) — Classes are being offered nationwide to encourage African Americans to learn about cooking fresh foods based on traditional African cuisine. The program is trying to combat obesity, heart disease and other ailments often linked to diet. (July 28) Video provided by AP
Powered by NewsLook.com
Asteroid's Timing Was 'Colossal Bad Luck' For The Dinosaurs

Asteroid's Timing Was 'Colossal Bad Luck' For The Dinosaurs

Newsy (July 28, 2014) — The asteroid that killed the dinosaurs struck at the worst time for them. A new study says that if it hit earlier or later, they might've survived. Video provided by Newsy
Powered by NewsLook.com
Raw: Sea Turtle Hatchlings Emerge from Nest

Raw: Sea Turtle Hatchlings Emerge from Nest

AP (July 27, 2014) — A live-streaming webcam catches loggerhead sea turtle hatchlings emerging from a nest in the Florida Keys. (July 27) Video provided by AP
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:
from the past week

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