Navigation Links
Circadian clock controls plant growth hormone
Date:8/13/2007

The plant growth hormone auxin is controlled by circadian rhythms within the plant, UC Davis researchers have found. The discovery explains how plants can time their growth to take advantage of resources such as light and water, and suggests that many other processes may be influenced by circadian rhythms.

Auxin tells shoots to grow away from the ground and toward light and water. Charles Darwin conducted early experiments that showed how auxin affects plant growth. Most plants and animals have an internal clock that allows them to match their activities to the time of day or season of the year.

The circadian rhythms appear to act by "gating" the effect of auxin, the researchers said. In other words, the plant becomes more responsive to auxin at a certain time of day.

Postdoctoral researcher Michael Covington and Stacey Harmer, professor in the Section of Plant Biology at UC Davis, used microarray chips to look at thousands of genes from the laboratory plant Arabidopsis at the same time. About 10 percent showed some regulation by time of day.

In the auxin signaling pathway, nearly every step in the chain of events from the production of auxin through to the final growth response showed some regulation by the clock.

Covington and Harmer made plants that would glow when the auxin signaling was active. They found a natural rhythm of activity, peaking late in the night when water is most available and the plants are preparing for daylight.

A circadian response to auxin was actually observed in 1937 but then forgotten for 70 years, Harmer said. The researchers hope to understand exactly why having a functional internal clock is important for plant health.


'/>"/>

Contact: Andy Fell
ahfell@ucdavis.edu
530-752-4533
University of California - Davis
Source:Eurekalert

Page: 1

Related biology news :

1. After a time-shift, mixed signals from the circadian clock
2. The circadian clock: Understanding natures timepiece
3. Gene controlling circadian rhythms linked to drug addiction
4. Temperature regulates circadian clock in zebrafish
5. A novel method to measure circadian cycles
6. A resetting signal keeps circadian rhythm on track in Drosophila fruit flies
7. New fruit fly protein illuminates circadian response to light
8. Circadian gene helps the brain predict mealtime
9. Research finds that circadian rhythms dominate all life functions
10. NYU researchers simulate molecular biological clock
11. Effective Cancer Treatments Follow The Clock
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/16/2017)...  Veratad Technologies, LLC ( www.veratad.com ), an innovative ... verification solutions, announced today they will participate as a ... thru May 17, 2017, in Washington D.C.,s ... Identity impacts the lives of billions ... evolving digital world, defining identity is critical to nearly ...
(Date:4/24/2017)... , April 24, 2017 ... and partner with  Identity Strategy Partners, LLP (IdSP) ... "With or without President Trump,s March 6, 2017 ... Terrorist Entry , refugee vetting can be instilled with ... resettlement. (Right now, all refugee applications are suspended ...
(Date:4/17/2017)... , April 17, 2017 NXT-ID, Inc. (NASDAQ: ... announces the filing of its 2016 Annual Report on Form 10-K ... Commission. ... 10-K is available in the Investor Relations section of the Company,s ... the SEC,s website at http://www.sec.gov . 2016 Year ...
Breaking Biology News(10 mins):
(Date:6/22/2017)... (PRWEB) , ... June 22, 2017 , ... The first ... took 20 years until the first data on cross-contamination of human cell lines with ... been an increasing issue in cell culture labs and is associated with dramatic consequences ...
(Date:6/20/2017)... ... 20, 2017 , ... HorizonScan is providing food and ingredient ... likely threat to their products at the annual IFT conference in Las Vegas, ... expo attracts over 20,000 attendees representing food science professionals from over 90 countries ...
(Date:6/19/2017)... ... June 19, 2017 , ... ... activities supporting EDETEK’s products including training, implementation, support, and client process and SOP ... role. He has previously held leadership roles for service providers and top-tier pharmaceuticals, ...
(Date:6/16/2017)... ... June 16, 2017 , ... Cambridge ... announced that its Anzo Smart Data Lake® (Anzo SDL) solution was named ... the 2017 Software & Information Industry Association (SIIA) CODiE Awards. , Finalists ...
Breaking Biology Technology: