Navigation Links
Scientists at CSHL discover mobile small RNAs that set up leaf patterning in plants
Date:2/28/2009

Cold Spring Harbor, N.Y. -- A key item in the developmental agenda of a plant leaf is the establishment of an axis that makes a leaf's top half distinct from its bottom half. This asymmetry is crucial for the leaf's function: it ensures that the leaf develops a flattened blade that is optimized for photosynthesis, with a top surface specialized for light harvesting and a bottom surface containing tiny pores that serve as locales for gas exchange.

For years, plant biologists have known that this top/bottom axis analogous to the front/back or "dorso-ventral" axis in animals is established by a signal derived from the meristem, the stem cell-rich growing tip of the plant from which new leaves arise. Other signals that traffic between the upper and lower sides of the leaf are thought to stably maintain this polar axis. Just as a GPS signal tells drivers where they are, these signals give cells positional information about where they are located within the leaf, causing them to acquire their correct identities by switching specific genes "on" or "off."

Associate Professor Marja Timmermans, Ph.D., and her team of scientists at Cold Spring Harbor Laboratory (CSHL) are the first group to uncover the identity of one such positional signal. In a study that appears in the March 1st issue of Genes and Development, they describe a family of mobile small RNAs that patterns the top/bottom axis in leaves. These small RNAs, they discovered, are generated on the upper surface of young leaves but traffic from this source to form a concentration gradient across each leaf. This graded distribution pattern creates discrete regions of gene activity so that cells in each half of a leaf develop a distinct "top" or "bottom" identity.

"We've known that small RNAs produced upon viral infection can move from cell to cell," explains Timmermans. "But this is the first time anyone has shown that small RNAs that are native to the organism are similarly m
'/>"/>

Contact: Hema Bashyam
bashyam@cshl.edu
516-367-6822
Cold Spring Harbor Laboratory
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Scientists unlock the secrets of C. difficiles protective shell
2. Scientists discover why teeth form in a single row
3. Einstein scientists receive $10 million NIH grant
4. From stem cells to new organs: Stanford and NYU scientists cross threshold in regenerative medicine
5. 40 minority scientists receive travel fellowships to Experimental Biology 2009 in New Orleans
6. Vanderbilt scientists invent worlds smallest periscopes
7. UCLA stem cells scientists make electrically active motor neurons from iPS cells
8. UCR scientists identify stem-cell genes that help form plant organs
9. Scientists mine drugs database for new diabetes treatment
10. Atmospheric scientists trace the human role in Indonesian forest fires
11. Scientists identify human monoclonal antibodies effective against bird and seasonal flu viruses
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/24/2014)... sticky research out of York University shows a surprisingly ... toxic grass fungus: moose saliva (yes moose saliva). ... "Ungulate saliva inhibits a grassendophyte mutualism" shows that moose ... (which hosts a fungus called epichlo festucae that produces ... less toxicity. , "Plants have evolved defense mechanisms to ...
(Date:7/24/2014)... has developed a new nanoscale agent for imaging the ... the function and properties of the GI tract in ... of gut diseases. , Illnesses such as ... bowel disease all occur in the intestine and can ... such as diabetes and Parkinson,s. , Until now, ...
(Date:7/24/2014)... O.D., a low vision specialist at The University of ... has been awarded a grant to help Harris County ... medication or surgery. , Even with corrective lenses, many ... However, there are a variety of low vision devices, ... offset their vision loss. , Iyer is using the ...
Breaking Biology News(10 mins):Moose drool inhibits growth of toxic fungus: York U research 2New imaging agent provides better picture of the gut 2UTHealth Dr. Bhavani Iyer awarded low vision grant 2
... BEAUMONT - Picture this - IV (intravenous) lines ... it sounds. It,s one way that scientists at,the ... may,contribute to the biofuel revolution. In Beaumont, ... Dr. Don Vietor, professor of crop physiology, have ...
... 2007 A double amputee whose trailblazing work in ... development of new prosthetic innovations that merge body and ... Heinz Award for Technology, the Economy and Employment, among ... Dr. Hugh Herr, 43, a professor at ...
... UPMC have identified a potential target for the ... most prevalent sexually transmitted bacterial infection in the ... MD, chief of the Division of Pediatric Infectious ... Chlamydia that, when investigated in an animal model ...
Cached Biology News:Herr receives Heinz Award for Technology, the Economy and Employment 2Herr receives Heinz Award for Technology, the Economy and Employment 3Herr receives Heinz Award for Technology, the Economy and Employment 4Study by Pittsburgh researchers identifies possible vaccine target for chlamydia 2
(Date:7/24/2014)... -- ECC West Africa, LLC (ECC) signed a contract in ... Hospital (UCH) Ibadan Board of Management for the first ... and operate and maintain a new, state-of-the-art Cancer Institute ... first of the 4-phase project, ECC will conduct feasibility ... Ibadan intends to finance and develop the Cancer Institute ...
(Date:7/24/2014)... Yet, scientists are making progress in devising suitable ... approach relies on quantum dotsa kind of artificial ... A new study demonstrates that changing the coupling ... electrical impulses can help better control them. This ... as quantum information units, which would produce faster ...
(Date:7/24/2014)... 24, 2014 Research and Markets ... Culture Market 2014-2018" report to their offering.  ... culture is the in vitro growth of plant or ... studies, and biopharmaceutical production. Cell culture is a crucial ... instruments and cell culture consumables are necessary for the ...
(Date:7/24/2014)... , July 24, 2014 SRI International has ... the National Institute of Allergy and Infectious Diseases (NIAID), ... preclinical development of potential therapies for HIV infection and ... treat HIV and AIDS and the complications and opportunistic ... for preventing sexual transmission of HIV. ...
Breaking Biology Technology:ECC Signs a Contract for the Finance, Design, and Construction of a Premier Cancer Institute in Ibadan, Nigeria 2Global Cell Culture Market 2014-2018: Key Vendors are Becton, Dickinson and Co, EMD, GE Healthcare, Lonza Group, Sigma Aldrich and Thermo Fisher Scientific 2National Institute of Allergy and Infectious Diseases Awards SRI International Contract to Study New Therapies for HIV and AIDS 2National Institute of Allergy and Infectious Diseases Awards SRI International Contract to Study New Therapies for HIV and AIDS 3
... for controlling quantum information pioneered by researchers at UC ... the Netherlands, and the Ames Laboratory at Iowa State ... quantum computations. Their findings, in a paper titled "Decoherence-protected ... published in the current issue of the journal ...
... Fla., April 4, 2012 BioRestorative Therapies, Inc. ... announced today that it has retained KCSA Strategic Communications, ... Company,s investor relations program. KCSA has ... (IR) communication campaign designed to enhance BRT,s reputation among ...
... American researchers have shown that prospective magnetic fusion power ... used for the production of weapon-usable materials than nuclear ... The researchers, from Princeton University, found that if nuclear ... there is little risk of fissile materials being produced ...
Cached Biology Technology:Quantum control protocols could lead to more accurate, larger scale quantum computations 2BioRestorative Therapies Retains KCSA Strategic Communications as Investor Relations Counsel 2BioRestorative Therapies Retains KCSA Strategic Communications as Investor Relations Counsel 3Fusion presents low proliferation risk, experts conclude 2
Ps-Aeruginosa (IgG) -Ab EIA Sample Size: 100 l...
APO(a) EIA Sample Size: 25 l...
... Reduce bench time to just 15 ... from the paralles that can be drawn between ... older idea of instant foods. Instant meals ... in freeze-dried format and are reconstituted by adding ...
Request Info...
Biology Products: