Featured Research

from universities, journals, and other organizations

Unearthing key function of plant hormone

Date:
February 28, 2014
Source:
Institute of Science and Technology Austria
Summary:
Plants, like animals, employ hormones as messengers, which coordinate growth and regulate how they react to the environment. One of these plant hormones, auxin, regulates nearly all aspects of plant behavior and development, for example phototropism, root growth and fruit growth. Depending on the context, auxin elicits a range of responses such as cell polarization or division. Scientists now report finding the molecular mechanism by which the plant hormone auxin affects the organization of the cell's inner skeletons.

Plants like these trees on the campus of IST Austria rely on auxin. This plant hormone regulates nearly all aspects of plant behavior and development.
Credit: IST Austria / Photo by Roland Ferrigato

Plants, like animals, employ hormones as messengers, which coordinate growth and regulate how they react to the environment. One of these plant hormones, auxin, regulates nearly all aspects of plant behavior and development, for example phototropism, root growth and fruit growth. Depending on the context, auxin elicits a range of responses such as cell polarization or division. In this week's edition of Science a team of researchers including Jiři Friml from IST Austria and led by Zhenbiao Yang of the University of California, Riverside, report finding the molecular mechanism by which the plant hormone auxin affects the organization of the cell's inner skeletons.

Related Articles


Auxin is a remarkable molecule, impinging on a variety of plant responses in growth and development. How auxin can play such a range of roles is as yet unexplained, though auxin may activate distinct signaling systems in different contexts and so convey different signals for different responses. For example, a nuclear receptor pathway modulates gene transcription in response to auxin. Auxin binding protein 1 (ABP1) has been proposed to act independently of this nuclear pathway, regulating responses at the plasma membrane and in the cytoplasm. ABP1 was discovered nearly 40 years ago, but how it transmits the auxin signal and regulates responses remained unclear to date. In their Science publication, the researchers show that at the cell surface ABP1 interacts with transmembrane kinases (TMKs). In genetic variants of Arabidopsis in which TMKs are mutated, pathways regulated by ABP1 are impaired such as the characteristic arrangement of pavement cells.

TMKs and ABP1 are also both required for the activation of ROP GTPases, which regulate the organization of the cell's inner skeleton. This cytoskeleton is disrupted when TMKs are mutated, as filamentous actin does not localize correctly and cortical microtubules are disorganized. The researchers show that all of TMK1 as well as around a quarter of ABP1 can be found at the plasma membrane. In the presence of auxin, TMK1 and ABP1 bind to each other. The researchers propose that secreted ABP1 binds to TMK1 at the plasma membrane in response to extracellular auxin, and signal to ROP GTPases which affect the cytoskeleton.

TMK1 is at least one of the long-sought docking proteins of ABP1, which couple extracellular auxin and its perception by ABP1 to downstream cytoplasmic events. Solving the mystery of cell surface-cytoplasmic auxin perception, this research opens up a new horizon in auxin biology.


Story Source:

The above story is based on materials provided by Institute of Science and Technology Austria. Note: Materials may be edited for content and length.


Journal Reference:

  1. T. Xu, N. Dai, J. Chen, S. Nagawa, M. Cao, H. Li, Z. Zhou, X. Chen, R. De Rycke, H. Rakusova, W. Wang, A. M. Jones, J. Friml, S. E. Patterson, A. B. Bleecker, Z. Yang. Cell Surface ABP1-TMK Auxin-Sensing Complex Activates ROP GTPase Signaling. Science, 2014; 343 (6174): 1025 DOI: 10.1126/science.1245125

Cite This Page:

Institute of Science and Technology Austria. "Unearthing key function of plant hormone." ScienceDaily. ScienceDaily, 28 February 2014. <www.sciencedaily.com/releases/2014/02/140228103429.htm>.
Institute of Science and Technology Austria. (2014, February 28). Unearthing key function of plant hormone. ScienceDaily. Retrieved April 19, 2015 from www.sciencedaily.com/releases/2014/02/140228103429.htm
Institute of Science and Technology Austria. "Unearthing key function of plant hormone." ScienceDaily. www.sciencedaily.com/releases/2014/02/140228103429.htm (accessed April 19, 2015).

Share This


More From ScienceDaily



More Plants & Animals News

Sunday, April 19, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Un-Bee-Lievable: Bees on the Loose After Washington Truck Crash

Un-Bee-Lievable: Bees on the Loose After Washington Truck Crash

Reuters - US Online Video (Apr. 17, 2015) A truck carrying honey bees overturns near Lynnwood, Washington, spreading boxes of live bees across the highway. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Our Love Of Puppy Dog Eyes Explained By Science

Our Love Of Puppy Dog Eyes Explained By Science

Newsy (Apr. 17, 2015) Researchers found a spike in oxytocin occurs in both humans and dogs when they gaze into each other&apos;s eyes. Video provided by Newsy
Powered by NewsLook.com
Dog Flu Spreading in Midwestern States

Dog Flu Spreading in Midwestern States

AP (Apr. 17, 2015) Dog flu is spreading in several Midwestern states. Dog daycare centers and veterinary offices are taking precautions. (April 17) Video provided by AP
Powered by NewsLook.com
Raw: Rare Whale Spotted in Gulf of Mexico

Raw: Rare Whale Spotted in Gulf of Mexico

AP (Apr. 17, 2015) Researchers from the E/V Nautilus had quite a surprise Tuesday, when a curious sperm whale swam around their remotely operated vehicle in the Gulf of Mexico. Cameras captured the encounter. (April 17) 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:

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