Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Missing piece of plant clock found

13.03.2009
Biologists at the University of California, San Diego have identified a key protein that links the morning and evening components of the daily biological clock of plants.

Their discovery, detailed in the March 13 issue of Science, solves a longstanding puzzle about the underlying biochemical mechanisms that control plant clocks and could provide a new way to increase the growth and yield of agricultural crops.

The finding is the first outcome of a larger effort to assemble a complete library of all proteins called transcription factors, which regulate genes, in Arabidopsis, a plant often used as a genetic model.

Scientists previously had identified two primary feedback loops in the plant daily clock – one that detects the onset of light in the morning and another that tracks when light fades in the evening.

"The best way to construct a robust clock would be to connect the loops so that they both communicate that information to each other," said Steve Kay, dean of the Division of Biological Sciences at UC San Diego whose research team made the discovery. "Now a protein we call CHE has provided that link."

CHE, first predicted nearly a decade ago, has proved difficult to find. Multiple backup systems for many important functions in plants, including timekeeping, frustrate efforts to identify the function of an individual molecule or gene.

"In plants there are a lot of redundancies – proteins that do similar things," said Jose Pruneda-Paz, a postdoctoral fellow at UC San Diego and the first author of the study. "In the clock, on top of the redundancies, you have feedback loops that are interconnected. So it's difficult to perturb the system."

Disrupting a protein will fail to reveal its function if the system can compensate for its loss, so the team took a different approach. They sorted through proteins with the ability to bind to DNA, and therefore to regulate genes, and selected candidates mostly likely to be part of a clock: the ones that cycle between abundant and scarce.

Of those cyclical proteins, only CHE stuck specifically to the part of plant DNA that controls a critical component of the morning loop. Further experiments demonstrated that CHE also binds to an evening loop protein providing the missing link.

Pruneda-Paz and his co-authors "solve a major puzzle in our understanding of the plant clock," wrote C. Robertson McClung, professor of biology at Dartmouth College, in a commentary on the article that will appear in the same issue of Science.

Evidence increasingly points to the clock as a critical component of functions growth and the timing of flowering. A recent paper published in Nature by a group at the University of Texas, Austin reports that an altered clock contributes to hybrid vigor, suggesting that targeting clock genes may be a way to improve the growth of crops. "It's going to be a way to come up with rational design for increasing yield in the field," Kay said.

Kay expects the growing catalog of transcription factors to be completed by the end of the year with more than 2,000 entries, he said. "This is going to be a significant resource for the plant science community developed here at UC San Diego."

Susan Brown | EurekAlert!
Further information:
http://www.ucsd.edu

More articles from Life Sciences:

nachricht If solubilty is the problem - Mechanochemistry is the solution
25.05.2018 | Technische Universität Dresden

nachricht The big clean up after stress
25.05.2018 | Julius-Maximilians-Universität Würzburg

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Molecular switch will facilitate the development of pioneering electro-optical devices

A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.

The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...

Im Focus: LZH showcases laser material processing of tomorrow at the LASYS 2018

At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.

At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...

Im Focus: Self-illuminating pixels for a new display generation

There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?

At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

Im Focus: Dozens of binaries from Milky Way's globular clusters could be detectable by LISA

Next-generation gravitational wave detector in space will complement LIGO on Earth

The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

 
Latest News

If solubilty is the problem - Mechanochemistry is the solution

25.05.2018 | Life Sciences

Investigating cell membranes: researchers develop a substance mimicking a vital membrane component

25.05.2018 | Interdisciplinary Research

When corals eat plastics

24.05.2018 | Ecology, The Environment and Conservation

VideoLinks
Science & Research
Overview of more VideoLinks >>>