Navigation Links
In elevated carbon dioxide, soybeans stumble but cheatgrass keeps on truckin'
Date:6/22/2010

early summer, creating dense mats rich in lignin and aromatics, compounds that are easily ignited and burn well. "When lightning strikes a bed of dead cheatgrass, it's like dropping a match into a lake of kerosene," the L.A. Times reported.

Once cheatgrass invades, fires start earlier, when native plants are more susceptible to injury. Repeated burning eventually kills all the native plants, and cheatgrass competition prevents their re-establishment.

"A cheatgrass landscape is about as ecologically rich as a parking lot," said the L.A. Times.

The mystery of photorespiration

Schaefer wanted to know whether differences at the molecular level gave the plant its competitive edge.

All plants make a living by tapping the energy in sunlight to "fix" the carbon in carbon dioxide by incorporating it in carbon-based molecules such as sugar.

Soybeans and cheatgrass are both C3 plants that use an enzyme to bind carbon dioxide from the air and join it to a five-carbon molecule, producing a six-carbon molecule that quickly splits into two three-carbon molecules (hence the name C3).

But, as Schaefer was aware, C3 plants have a puzzling metabolic quirk. On a hot day, the plants close their stomata, the pores mainly on the undersides of leaves, to cut down on water loss. This in itself is adaptive.

But when the stomata close, the carbon dioxide concentration in the air spaces inside the leaf also falls.

Instead of binding carbon dioxide, the enzyme then binds oxygen and forms a five-carbon rather than a six-carbon molecule, which gets split into a three-carbon and a two-carbon molecule.

The math doesn't work.

The two-carbon molecule can't go through the carbon-fixing process directly. Instead it goes through a cascade of reactions and is then fed back into the carbon fixation cycle.

This process, called photorespiration because it occurs in the light and releases carbon d
'/>"/>

Contact: Diana Lutz
dlutz@wustl.edu
314-935-5272
Washington University in St. Louis
Source:Eurekalert  

Page: 1 2 3 4 5

Related biology news :

1. Newly identified enzymes help plants sense elevated CO2 and could lead to water-wise crops
2. Elevated water temperature and acidity boost growth of key sea star species: UBC researchers
3. Landmark studies assess risk of exposure to elevated levels of EMS confirm clear toxicity threshold
4. Elevated carbon dioxide changes soil microbe mix below plants
5. Elevated nitric oxide in blood is key to high altitude function for Tibetans
6. Survey finds elevated rates of new asthma among WTC rescue and recovery workers
7. Enzyme trio for biosynthesis of hydrocarbon fuels
8. Storing carbon dioxide deep underground in rock form
9. Geochemist raises questions about carbon sequestration at Goldschmidt Conference
10. Delineating primary and secondary organic carbon in neoproterozoic glacial sediments
11. ORNL sows seeds with new agricultural carbon accounting tool
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
In elevated carbon dioxide, soybeans stumble but cheatgrass keeps on truckin'
(Date:10/16/2014)... 16, 2014) – Post-menopausal women experienced improvements in ... levels or genital bleeding, after 12 weeks of ... fermented soy germ-based nutritional supplement previously shown to ... new peer-reviewed pilot study reported in a poster ... scientific meeting. , "These data documented improved ...
(Date:10/15/2014)... from strains of influenza virus increases with the latest ... complacent that the most substantial threats have been identified, ... arise when a new virus strain – against which ... in the human population. There have been five such ... which – the 1918 Spanish Flu – cost 50 ...
(Date:10/15/2014)... Ebola virus is spreading rapidly and to an unexpected ... in the past and the virus shows a new ... recorded before. For this reason, the German National Academy ... Science and Engineering, and the Union of the German ... on the Ebola epidemic today. , In the statement ...
Breaking Biology News(10 mins):S-equol supplements associated with improved measures of reproductive health in postmenopausal women 2Scientists 'must not become complacent' when assessing pandemic threat from flu viruses 2Academies call for consequences from the Ebola virus epidemic 2Academies call for consequences from the Ebola virus epidemic 3Academies call for consequences from the Ebola virus epidemic 4Academies call for consequences from the Ebola virus epidemic 5
... has brought powerful software to the never-ending arms race ... biochemists have developed and laboratory-tested a computer program that ... bacteria use to make natural antibiotics. ... as the algorithm "K*" (pronounced K Star)-- is able ...
... University researchers want to strengthen chemistry skills starting ... ways for high school- and college-level educators to ... Melanie Cooper and Gautam Bhattacharyya, along with Michael ... molecular, cellular and developmental biology at the University ...
... of a symposium on "Defining species for threatened ... Service, will discuss the need to explicitly consider ... concepts continue to be a contentious, but largely ... between groups of organisms are identified, however, can ...
Cached Biology News:Duke software dramatically speeds enzyme design 2Duke software dramatically speeds enzyme design 3Clemson chemists present revolutionary teaching concepts 2Dealing with taxonomic uncertainty for threatened and endangered species 2
(Date:10/25/2014)...  RegeneRx Biopharmaceuticals, Inc. (OTCBB: RGRX) ("the Company" or ... International Symposium on Thymosins in Health and Disease in ... "When thymosin beta 4 (TB4) linked with rhodamine (a ... in a rodent model of stroke, it was visualized ... (the functional tissue of the brain).   The leakage of ...
(Date:10/25/2014)... 2014 Research and Markets has ... Product , Research Area & by End User - ... In this report, the global epigenetics ... areas, and end users. The product segments of the ... & consumables, kits, and reagents. The subsegments of the ...
(Date:10/22/2014)... New test innovations will be the source ... test industry, especially as companies struggle with reimbursement challenges, ... than 25 testing innovations in important disease areas in ... products. Kalorama details the new approaches its biennial survey of ... Vitro Diagnostic Tests , 9th Edition . ...
(Date:10/22/2014)... , Oct. 22, 2014  Actavis plc (NYSE: ... company, and Rhythm, a biopharmaceutical company, today announced that ... Rhythm,s wholly owned subsidiary, Rhythm Health, Inc., which is ... treatment of diabetic gastroparesis and other GI functional disorders. ... 2 trial of relamorelin for the treatment of diabetic ...
Breaking Biology Technology:Researchers Report Thymosin Beta 4 Crosses Blood-Brain Barrier In Animal Stroke Model 2Global Epigenetics (VLA, WBA, NBA, RTA, Rotary-Wing Aircraft) Market - Forecast to 2019 2Global Epigenetics (VLA, WBA, NBA, RTA, Rotary-Wing Aircraft) Market - Forecast to 2019 3Report: Radical New IVD Test Approaches Key To Growth 2Report: Radical New IVD Test Approaches Key To Growth 3Actavis Signs Option to Acquire Rhythm Subsidiary and its GI Development Product, Relamorelin 2Actavis Signs Option to Acquire Rhythm Subsidiary and its GI Development Product, Relamorelin 3Actavis Signs Option to Acquire Rhythm Subsidiary and its GI Development Product, Relamorelin 4Actavis Signs Option to Acquire Rhythm Subsidiary and its GI Development Product, Relamorelin 5
... , EMERYVILLE, Calif. , ... today announced that it will present at the 12th Annual BIO ... at 8:30 a.m. Eastern Time ( 5:30 a.m. Pacific ... presentation on our website at: , http://www.onyx-pharm.com/view.cfm/32/Event-Calendar , ...
... ... 20 Years of Experience to Biochemical Innovator, , ... Houston, TX (PRWEB) February 2, 2010 ... microbiology innovations that produce green chemicals, today announced the appointment of Daniel J. ...
... , SANTA ROSA, Calif. ... Month, EcoNugenics introduces the newest in ... Santa Rosa, CA -based nutraceutical company, founded in 1995 by integrative ... MS, LAc, has once again demonstrated excellence in being at the forefront ...
Cached Biology Technology:Onyx Pharmaceuticals to Present at the 12th Annual BIO CEO & Investor Conference 2Glycos Biotechnologies Expands Management Team with Appointment of Vice President of Research and Development 2Glycos Biotechnologies Expands Management Team with Appointment of Vice President of Research and Development 3Just in Time for Heart Health Month... TRIPLE Cardiovascular Health Support From EcoNugenics 2Just in Time for Heart Health Month... TRIPLE Cardiovascular Health Support From EcoNugenics 3
... (RNase-free) (E.C. 3.1.21.1) is a nonspecific endonuclease ... It functions by hydrolyzing phosphodiester linkages, producing ... a 3'-hydroxyl group. Ambion's RNase-free DNase I ... is recommended to degrade DNA in the ...
RABBIT ANTI RHEB (IN) Immunogen: A 15 amino acid peptide located in the central region of human Rheb....
... a unique β-agarose digesting enzyme developed at ... DNA and RNA from low melting point ... TBE, MOPS, or phosphate buffers. The gel ... TBE, MOPS, and phosphate electrophoresis buffers or ...
... GELase™ Agarose Gel-Digesting Preparation contains a ... for simple, quantitative recovery of intact DNA ... agarose gels following electrophoresis in TAE, TBE, ... be digested directly in the TAE, TBE, ...
Biology Products: