Navigation Links
Circadian clock controls plant growth hormone

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
University of California - Davis

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:
(Date:6/14/2017)... (NYSE: IBM ) is introducing several innovative partner startups ... collaboration between startups and global businesses, taking place in ... nine startups will showcase the solutions they have built with ... France is one of the ... percent increase in the number of startups created between 2012 ...
(Date:5/16/2017)... -- Veratad Technologies, LLC ( ), an innovative and ... solutions, announced today they will participate as a sponsor ... May 17, 2017, in Washington D.C.,s ... Identity impacts the lives of billions of ... digital world, defining identity is critical to nearly every ...
(Date:5/6/2017)... -- RAM Group , Singaporean based technology ... biometric authentication based on a novel  quantum-state ... perform biometric authentication. These new sensors are based on a ... Group and its partners. This sensor will have widespread ... security. Ram Group is a next generation sensor ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... (PRWEB) , ... October 12, ... ... today announces publication of a United States multicenter, prospective clinical study that ... disposable, point-of-care diagnostic test capable of identifying clinically significant acute bacterial and ...
(Date:10/11/2017)... Charlotte, N.C. (PRWEB) , ... October 11, 2017 ... ... ARCS® Foundation President Andi Purple announced Dr. Suneel I. Sheikh, the ... Laboratories ( ASTER Labs ), Inc. has been selected for membership in ...
(Date:10/11/2017)... BALTIMORE, Md. (PRWEB) , ... October 11, 2017 ... ... for digital pathology, announced today it will be hosting a Webinar titled, “Pathology ... of  Advanced Pathology Associates , on digital pathology adoption best practices and how ...
(Date:10/11/2017)... , ... October 11, 2017 , ... ... the implantation and pregnancy rates in frozen and fresh in vitro fertilization ... progesterone and maternal age to IVF success. , After comparing the results from ...
Breaking Biology Technology: