HOME >> BIOLOGY >> NEWS
The role of phytochromes in bacteria revealed

The phytochromes are photosensitive substances which play an essential role in the various phases of plant development and growth. As photoreceptors they act as sensors that convey information to the plant about changes in ambient light. The two existing forms -active and inactive- can switch one to the other in response to such changes. Under red light they become active and trigger off a cascade of biochemical, in the plant cells to induce processes such as germination, flowering or stem elongation. Although it is well established that phytochromes function like light switches, the chain of biochemical reactions triggered when they are activated are still not well understood. Phytochromes were discovered in bacteria five years ago. However, their role even in these simple organisms has remained difficult to fathom. This has now been partially clarified by researchers from the IRD (Institut de Recherche pour le Dveloppement) and the CEA in conjunction with the CNRS. Their revelatory work has just been published in Nature. The study of bacteriophytochromes might give useful insights into the functional mechanisms of their counterparts in plants.

A research team jointly involving the IRD, the CEA and the CNRS has very recently found phytochromes in a strain of nitrogen-fixing bacterium, Bradyrhizobium (1), symbiont on certain tropical leguminous plants (the Aeschynomene). Techniques of molecular biology, biophysics and biochemistry revealed that the newly-discovered phytochrome has an essential role as regulator of the bacteriums photosystem synthesis. An identical function was shown in the photosynthetic bacterium Rhodopseudomonas palustris, phylogenetically very close to Bradyrhizobium (2).

The researchers experimented by subjecting Bradyrhizobium cells to different wavelengths of light, from the red to the infrared. It appeared that the bacterial photosynthetic apparatus was synthesized in its complete form only when the phytochrome was in its active
'"/>

Contact: Marie Lise Sabrie
sabrie@paris.ird.fr
33-01-48-03-75-36
Institut de Recherche Pour le Dveloppement
13-May-2002


Page: 1 2 3

Related biology news :

1. Researchers find color sensitive atomic switch in bacteria
2. Cancer vaccine based on pathogenic listeria bacteria shows promise targeting metastases
3. Researchers create nanotubes that change colors, form nanocarpet and kill bacteria
4. Scientists discover potential new way to control drug-resistant bacteria
5. 22nd amino acid synthesized and added to genetic code of e. coli bacteria
6. Missing genes may help explain why plague bacteria are so deadly
7. Complex cells likely arose from combination of bacterial and extreme-microbe genomes
8. Stuck on you: Scientists lay bare secrets of bacterial attachment proteins
9. UC Irvine scientists to develop vaccine to combat bioterrorism threat from deadly bacteria
10. UV light, coatings reduce bacterial adhesion up to 50 percent
11. PCB breakdown in rivers depends on sediment-specific bacteria, find Carnegie Mellon U. scientists

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: The role phytochromes bacteria revealed

(Date:11/6/2014)... A groundbreaking paper from a team of Florida State ... how plants could adapt to and survive environmental swings ... in the latest issue of the journal The ... complex of DNA and proteins) is organized in a ... some genes are turned on and others are turned ...
(Date:11/6/2014)... November 6, 2014 - Insilico Medicine, Inc, a ... and age related diseases announced a research collaboration ... cancer, Champions Oncology, Inc (OTC: CSBR). , "There ... personalized medicine, but Champions Oncology,s TumorGraft technology is ... the chemotherapy regimen experimentally generating vast amounts of ...
(Date:11/5/2014)... in their ability to identify scents and odors. ... perceptual evaluation of odors, with women outperforming men on ... differences in olfactory detection may play a role in ... perception of smell, which is naturally linked to associated ... suggested to be cognitive or emotional, rather than perceptual. ...
Breaking Biology News(10 mins):Maize analysis yields whole new world of genetic science 2Insilico Medicine, Inc announces research collaboration with Champions Oncology, Inc 2The female nose always knows: Do women have more olfactory neurons? 2
(Date:11/26/2014)... The report on the Global Smart Sensor Market ... for revenue forecasts and market trends. It expects the ... 2013 to 2018. At the projected rate, the market ... by 2018. , Browse through the Global Smart Sensor ... the market segmentation and in-depth analysis supported by a ...
(Date:11/26/2014)... HOUSTON and PHILADELPHIA , ... the most demanding and unforgiving environments. Human exploration of ... cognitive performance to ensure mission safety and success, and ... cognitive performance for mission success, little is known about ... aspects of cognition are primarily affected. Now, ...
(Date:11/26/2014)... November 25, 2014 Whitehouse Laboratories ... joined the Morris County (New Jersey) Chamber of ... a leading business organization in the North Jersey ... further engage some key clients in the pharmaceutical ... the geographic area. Membership enables Whitehouse Laboratories a ...
(Date:11/26/2014)... 25, 2014 Global biostimulants market ... growing at an estimated CAGR of 12.5%. In ... food products with least ecological impacts, farmers are ... to boost crop yield more effectively & efficiently. ... can improve the return on investments. , Leading ...
Breaking Biology Technology:Global Smart Sensor Market in Building Automation is expected to reach a value of $1,415.6 million by 2018 - Report by MicroMarket Monitor 2Global Smart Sensor Market in Building Automation is expected to reach a value of $1,415.6 million by 2018 - Report by MicroMarket Monitor 3Global Smart Sensor Market in Building Automation is expected to reach a value of $1,415.6 million by 2018 - Report by MicroMarket Monitor 4Penn Medicine Team Develops Cognitive Test Battery to Assess the Impact of Long Duration Spaceflights on Astronauts' Brain Function 2Penn Medicine Team Develops Cognitive Test Battery to Assess the Impact of Long Duration Spaceflights on Astronauts' Brain Function 3Penn Medicine Team Develops Cognitive Test Battery to Assess the Impact of Long Duration Spaceflights on Astronauts' Brain Function 4Whitehouse Laboratories Joins Morris County Chamber of Commerce 2Whitehouse Laboratories Joins Morris County Chamber of Commerce 32019 Biostimulants Market to Grow at a CAGR of 12.5% Says a New Research Report Available at RnRMarketResearch.com 22019 Biostimulants Market to Grow at a CAGR of 12.5% Says a New Research Report Available at RnRMarketResearch.com 32019 Biostimulants Market to Grow at a CAGR of 12.5% Says a New Research Report Available at RnRMarketResearch.com 4
Cached News: