HOME >> BIOLOGY >> NEWS
Photosystem I -- An Intermediate Step -- May Not Be Necessary For Plants

ITHACA, N.Y. -- Plant biologists have long held the view that photosynthesis -- the process by which cells in green plants convert the energy of sunlight into chemical energy and use carbon dioxide to produce sugars -- needs two intermediate light-dependent reactions for successful energy conversion: Photosystem II and Photosystem I.

But according to a new study reported today (July 19), that dogma may have gone for a walk, and scientists may have to rethink some aspects of how photosynthesis works. "Scientists have thought they understood photosynthesis for a long time, and this revelation flies in the face of what we know," said Thomas G. Owens, Cornell University associate professor of plant biology. "What does this all mean? No one knows yet."

The Z scheme is the classic example of how scientists describe the light-dependent reactions of photosynthesis. When photons -- particles of light -- enter a plant cell, their energy is used to power two sequential light-dependent reactions. In Photosystem II (PSII), the light energy is used to split water, producing oxygen and electrons. In Photosystem I (PSI), these electrons are used to produce compounds that ultimately react with carbon dioxide to produce carbohydrates, lipids, proteins and nucleic acids -- the fundamental components of life.

But Owens and researchers from the Oak Ridge National Laboratory in Tennessee found that in some cases photosynthesis can occur in the absence of PSI, they report in the journal Science (July 19, 1996). The report, "Oxygenic Photoautotrophic Growth Without Photosystem I," was authored by James W. Lee, C.V. Tevault and Elias Greenbaum, all of the Oak Ridge National Laboratory, and Cornell's Owens.

The scientists from Oak Ridge used artificially developed mutants of a green alga to find this new life process.

"It is a very important discovery; I didn't believe any of this stuff when it was first reported. I thought it was impossible, but cooperation between
'"/>

Contact: Blaine Friedlander
bpf2@cornell.edu
607-255-3290
Cornell University News Service
19-Jul-1996


Page: 1 2

Related biology news :

1. Oxygen-Carrying Myoglobin Not Necessary For Survival
2. Plants will not save us from greenhouse gases
3. Plants for the future: A European vision for plant biotechnology towards 2025
4. Plants circadian clocks tune into latitude to enhance fitness
5. Plants and people share a molecular signaling system, researchers discover
6. Nonnative Invasive Plants of Southern Forests
7. Plants, insects play cat and mouse game
8. Plants vs. disease: Trench warfare at the molecular level
9. Plants as plants: gene could convert crops to plastics factories
10. Plants, pathogens engage in trench warfare
11. Study: Microgravity May Enhance Gene Transfer In Plants

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/24/2017)... Mar 24, 2017 Research and Markets has ... Market Analysis & Trends - Industry Forecast to 2025" report ... ... at a CAGR of around 15.1% over the next decade to ... report analyzes the market estimates and forecasts for all the given ...
(Date:3/22/2017)... 2017 Vigilant Solutions , a vehicle ... agencies, announced today the appointment of retired FBI special ... safety business development. Mr. Sheridan brings more ... a focus on the aviation transportation sector, to his ... Mr. Sheridan served as the Aviation Liaison Agent Coordinator ...
(Date:3/9/2017)... Australia , March 9, 2017 4Dx ... prestigious World Lung Imaging Workshop at the University of ... was invited to deliver the latest data to world ... recognised event brings together leaders at the forefront of ... in lung imaging. "The quality of ...
Breaking Biology News(10 mins):
(Date:4/20/2017)... SANTA BARBARA, CALIFORNIA (PRWEB) , ... April 20, 2017 , ... ... process optimization firm for the life sciences and healthcare industries, is pleased to announce ... of the new established USDM subsidiary “USDM Europe GmbH” based in Germany. , ...
(Date:4/20/2017)... CA (PRWEB) , ... April 20, 2017 , ... ... of clinical trials worldwide, announced today that they were named one of the ... which covers the latest developments in the pharmaceutical industry. , “We take pride in ...
(Date:4/19/2017)... ... 2017 , ... The Vibrating Orifice Aerosol Generator (VOAG) was ... droplets of known diameters for research applications such as for calibrating droplet measuring ... monodisperse droplets. , The VOAG requires forcing liquid out of an orifice ...
(Date:4/19/2017)... Waltham, MA (PRWEB) , ... April 19, 2017 ... ... of a $1.5M Series A-1 financing round. This event adds to several other ... establishment of its’ Executive and Scientific Teams. , ThermaGenix will use ...
Breaking Biology Technology:
Cached News: