Navigation Links
Scientists learn how horseweed shrugs off herbicide
Date:6/16/2011

arbage disposal for chemicals foreign to the plant.

There were two phosphorus NMR signals because the resonant frequency of a chemical species depends upon the local chemical environment and the plant vacuole is significantly more acidic than the cytoplasm.

Within 24 hours, resistant horseweed had managed to shuttle 85 percent of the glyphosate into the vacuole. Sensitive horseweed, on the other hand, had disposed of only 15 percent of the glyphosate in this way.

Scientists believe resistant horseweed has a pump in the tonoplast (the membrane surrounding the vacuole) that actively shuttles glyphosate into this storage compartment where it can no longer interfere with the critical biological reactions taking place in the chloroplast (the small green organelle to the upper left).

Meanwhile, the glyphosate remaining in the cytoplasm was being transported together with sugars to rapidly growing parts of the plant, such as young leaves and root tips.

Once glyphosate reaches such "metabolic sinks," it interrupts the critical shikimate pathway and kills the plant. Within 24 hours, sensitive plants had translocated 35 percent of the glyphosate from the source leaves to these sink tissues, whereas resistant plants had allowed only 15 percent to move to the sinks and much of this was shuttled into the vacuole of the sink tissue, thus further reducing chloroplast exposure.

"It's really a race," says d'Avignon. "Once glyphosate gets to the vacuole it is trapped," he says. "Because resistant horseweed rapidly shuttles glyphosate into the vacuole, there's less of it available for translocation to rapidly growing parts of the plants."

The scientists believe resistant horseweed has a pump, or transporter, that actively moves glyphosate across the tonoplast (the vacuole membrane).

"The existence of a glyphosate transporter is a surprise," says d'Avignon. "People had thought glyphosate moved into plant cells and
'/>"/>

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

0

GOOD

Page: 1 2 3 4 5

Related biology news :

1. Jefferson scientists deliver toxic genes to effectively kill pancreatic cancer cells
2. Scientists identify novel inhibitor of human microRNA
3. Argonne scientists peer into heart of compound that may detect chemical, biological weapons
4. MU scientists go green with gold, distribute environmentally friendly nanoparticles
5. Scientists identify gene that may contribute to improved rice yield
6. Scientists discover why a mothers high-fat diet contributes to obesity in her children
7. MU scientists see how HIV matures into an infection
8. Earth scientists keep an eye on Texas
9. Thinking it through: Scientists call for policy to guide biofuels industry toward sustainability
10. Scientists identify a molecule that coordinates the movement of cells
11. Scientists Find new migratory patterns for Mediterranean and Western Atlantic bluefin tuna
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Scientists learn how horseweed shrugs off herbicide
(Date:5/17/2013)... Societies for Experimental Biology (FASEB) released a new ... trends highlighting the devastating impact of sequestration on the ... follows a May 15th Senate Appropriations Committee hearing featuring ... the $1.6 billion cut the agency sustained in FY ... on the scientific community." , According to data ...
(Date:5/16/2013)... (May 17, 2013) Illustrating a commitment to ... American Gastroenterological Association (AGA) Research Foundation has announced ... Research Fellowship Award recipients. Supported by the National ... (NIDDK), this new award helps underrepresented minority students ... and nutrition research. , "By establishing this new ...
(Date:5/16/2013)... Bethesda, MD FASEB MARC (Maximizing Access to ... recipients for The Society for Developmental Biology (SDB) ... 16-20, 2013. These awards are meant to promote ... underrepresented groups into the mainstream of the basic ... young scientists at the SDB 2013 Annual Meeting. ...
Breaking Biology News(10 mins):Underrepresented minority students receive fellowships in digestive disease and nutrition research 2
... A study by researchers at Tufts University School of ... and Tufts Medical Center improves our current understanding of the ... for breast cell differentiation that identifies two populations of progenitor ... origin for luminal-like breast cancer, the most common form of ...
... 1. Prescribed Opioids Associated with Significant Risk for Overdose ... have increased significantly over the past decade. As long-term ... the deaths associated with opioids increase. Opioid overdose is ... sought to determine the rate of opioid overdose in ...
... studies published in Nature Genetics today, researchers ... An international team comprising researchers from more than 100 ... than 100,000 people of European descent to uncover the ... identified ten novel genetic markers for biological traits underlying ...
Cached Biology News:Cell of origin identified for common type of breast cancer 2Annals of Internal Medicine tip sheet for Jan. 19, 2010, issue 2Annals of Internal Medicine tip sheet for Jan. 19, 2010, issue 3From biological basics to diabetes discovery 2From biological basics to diabetes discovery 3
(Date:5/17/2013)... 2013  Insero Health, Inc., a company developing natural ... related neurological disorders, is today reporting top-line results from ... in patients with drug-resistant epilepsy.  The data are being ... Xll meeting by Dr. Steven Schachter ... Scientific Advisory Board.  In this study, INS001 appeared safe ...
(Date:5/17/2013)... Rust removal is one of home maintenance's essential processes. ... damaged. To help rust contractors make it less expensive, My ... remover it called Rusterizer. It announced that for this ... My Cleaning Products explained that rust could damage items in ... The first one, it said, happens when rust forms ...
(Date:5/16/2013)... ISPE announced today that ... the newly created position of Vice President of ... be responsible for stimulating ISPE’s revenue growth by ... Society’s Member-led and staff-driven business model, initiating integrated ... membership and product marketing. , “Barbara joins ISPE ...
(Date:5/16/2013)... Cambridge Healthtech Institute will host its ... at the Renaissance Waterfront Hotel in Boston, MA. ... look at the current strategies and innovations for optimizing ... Leaders in the field will reveal how their work ... greater specificity and efficiency. , “In this age of ...
Breaking Biology Technology:Insero Health Reports Positive Data on Phase I Trial of Novel Therapy for Drug-resistant Epilepsy 2Organic-Based Rust Remover Cuts Down Price by 10%, My Cleaning Products Details Mechanics How to Get the Discount 2ISPE Names Barbara A. Myers, CAE, as Vice President of Professional Development 2The 2013 Bioprocessing Summit to Bring Together International Leaders to Discuss Today's Bioprocess Issues From Cell Line Selection to Manufacturing in Boston, MA 2
... Inc. (OTC/BB: TBIO) today reported financial results for the three ... Second Quarter Financial ResultsNet sales for the ... 50 percent compared with $5.1 million for the same period ... of net sales, compared with gross profit of $2.5 million ...
... 11, 2011 The American College of Medical Genetics ... Online Live Learning Center , which will bring online ... This valuable, on-demand resource brings the latest educational programming ... such as the Genetics Review Course and Annual Meeting ...
... Md., Aug. 11, 2011 GenVec, Inc. (Nasdaq: ... approved the replacement of its Stockholder Rights Plan through the ... Plan is to become effective on September 7, 2011, which ... to expire. The new Rights Agreement was adopted in connection ...
Cached Biology Technology:Transgenomic Reports Second Quarter Financial Results 2Transgenomic Reports Second Quarter Financial Results 3Transgenomic Reports Second Quarter Financial Results 4Transgenomic Reports Second Quarter Financial Results 5Transgenomic Reports Second Quarter Financial Results 6Transgenomic Reports Second Quarter Financial Results 7Transgenomic Reports Second Quarter Financial Results 8Transgenomic Reports Second Quarter Financial Results 9ACMG Announces New Online Live Learning Center: Will Bring Genetics and Genomics Education to Varied Health Professionals 2GenVec Renews Stockholder Rights Plan 2GenVec Renews Stockholder Rights Plan 3
... strip ejector is a unique product that ... from their holder. Linkage: This CLS number ... easily match Cornings product number. If showing ... old Sigma-Aldrich number (Z71,314-7) or contact customer ...
... This benchtop ductless exhaust hood ventilates ... safe indoor release of exhaust. Bonded ... Over 28" of vertical clearance (with ... Includes polypropylene spill tray; options include ...
Sigmas E-TOXATE (Limulus Amebocyte Lysate) test kits are intended for the detection and semiquantitation,of endotoxins for research purposes....
... The ideal modular cleanroom for biological ... that require cleanliness (to Class 10/ISO ... precision-joined to create ultra-smooth surfaces that ... disinfect. One-inch radius corners simplify cleaning. ...
Biology Products: