Navigation Links
Being small has its advantages, if you are a leaf
Date:7/6/2011

will be happy," said Christine Scoffoni, a UCLA doctoral student in the department of ecology and evolutionary biology and lead author of the research. "But when one of these three fundamental resources becomes scarce, the plant will have to find a way to cope with it or die, because there is no escape. Coping with drought can be a strong selective factor on leaf form, especially on size and their venation."

"When we ask our students in plant physiology class why plants need water, their first answer is for growth," Sack said. "They are amazed to learn that the bulk of the water used by a plant is actually to make up for the water lost through transpiration, which would otherwise dry out the leaves. When the leaves open the small pores on their surface, the stomata, to capture carbon dioxide for photosynthesis, water is lost to the dry atmosphere. To stay moist inside, the plants need to replace the water lost by evaporation."

To do this, plants need to maintain the continuity of water in their "pipe delivery system," even as water is being pulled up by the leaves to replace water that has been lost to the air. This places tension on the water in the pipe system, known as the xylem, which runs through the roots and stem and into the leaf veins. And that continuity is challenged by dry soil, Sack explained.

"The less water in the soil, the more the leaves have to pull to get some out, so stronger tension starts building in the plant's pipes," Scoffoni said. "At a certain level of tension, an air bubble is pulled in from outside, blocking the flow of water. One way for a plant to withstand drought is to tolerate many of these embolisms."

Having more major vein routes by which water can flow around the air bubble provides this ability. Smaller leaves, possessing more major veins spaced closely together in a given square centimeter, have this ability, Sack said.

To test this idea, the UCLA team collaborated with pro
'/>"/>

Contact: Stuart Wolpert
swolpert@support.ucla.edu
310-206-0511
University of California - Los Angeles
Source:Eurekalert

Page: 1 2 3 4

Related biology news :

1. BUSM names Deborah Frank, M.D., inaugural professors in child health and well-being
2. Inability to cry in patients with Sjogrens syndrome affect emotional and mental well-being
3. Its not easy being green
4. Missouri elk are being reintroduced in the wrong part of the state, MU anthropologist says
5. DNA stretching -- A new technique being carried out at CIC microGUNE to detect illnesses
6. Plant breeding is being transformed by advances in genomics and computing
7. Sensors to detect explosives, monitor food being developed at UH
8. Being good moms couldnt save the woolly mammoth
9. Study suggests that being too clean can make people sick
10. Biodiesel from sewage sludge within pennies a gallon of being competitive
11. Selected highlights of the research being presented at the Experimental Biology 2010 meeting
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/19/2014)... years has adapted to the arctic cold, and then you ... for you. , This is happening to the small white ... called nonylphenol, comes from the use of certain detergents, pesticides ... disruptor, but when entering the worm it has another dangerous ... in its body from cold damage. , Enchytraeus albidus ...
(Date:9/18/2014)... GSA Bulletin study uses tree rings to document ... Wash in northern New Mexico, USA. By determining burial ... investigators were able to precisely date arroyo sedimentary beds ... data with aerial imagery, LiDAR, longitudinal profiles, and repeat ... Arroyos are deep, oversized channels that have vertical or ...
(Date:9/18/2014)... A novel robotic system that can operate inside the ... as part of a biomedical research partnership program at ... of determining if the robot, in conjunction with real-time ... accurate, less costly, and less discomforting for the patient. ... prostate cancer therapies with greater precision. , Developed by ...
Breaking Biology News(10 mins):Environmental pollutants make worms susceptible to cold 2Environmental pollutants make worms susceptible to cold 3Tree rings and arroyos 2Tree rings and arroyos 3Tree rings and arroyos 4Tree rings and arroyos 5Tree rings and arroyos 6Tree rings and arroyos 7Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 2Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 3Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 4Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 5
... MARC (Minority Access to Research Careers) Program has ... Annual International Conference on Intelligent Systems for Molecular ... on Computational Biology (ECCB), an official conference of ... Vienna, Austria from July 15-19, 2011. These ...
... (CHICAGO) Women with the BRCA1 or BRCA2 gene ... of breast and ovarian cancer, can safely take hormone-replacement ... of their ovaries, according to new research from the ... which will be presented Monday, June 6 during the ...
... Event details: , 4:00 5:00 PM eastern, Monday, June ... The Gulf of Mexico is vital to the United States ... recreational fishery production, shipping, and tourism. Its cultural significance ... inhabitants in the face of disasters has inspired the rest ...
Cached Biology News:Women with BRCA mutations can take hormone-replacement therapy safely after ovary removal 2Women with BRCA mutations can take hormone-replacement therapy safely after ovary removal 3Gulf of Mexico ecosystems 1 year after the Deepwater Horizon 2Gulf of Mexico ecosystems 1 year after the Deepwater Horizon 3
(Date:9/19/2014)... electricity, to move data would consume much less ... concern as chips, transistor counts rise. , Of ... light emitters, modulators, and detectors emitters are ... for optical chips is molybdenum disulfide (MoS2), which ... single, atom-thick layer. Other experimental on-chip light emitters ...
(Date:9/19/2014)... Sept. 19, 2014  Nektar Therapeutics (NASDAQ: ... studies characterizing the analgesic profiles of a series ... receptor agonist molecules. The preclinical research candidates were ... platform. The analgesic properties of kappa ... literature. 1,2 Kappa opioid receptors are expressed ...
(Date:9/19/2014)... 19, 2014 Cereal grain scientists, ... will gather October 5–8, 2014, for the AACC ... Convention Center in Providence, Rhode Island. The comprehensive ... of food scientists, chemists, microbiologists, nutritionists, and those ... production management. To date, 1,000 attendees have registered ...
(Date:9/18/2014)... (PRWEB) September 18, 2014 Bipartisan passage ... a bill designed to stimulate development and commercialization of ... being praised by leaders of SPIE, the international ... Revitalizing American Manufacturing and Innovation (RAMI) Act, now moves ... authors have said they are optimistic that it will ...
Breaking Biology Technology:Toward optical chips 2Toward optical chips 3Nektar Presents Positive Preclinical Data on Oral, Peripherally-Acting Kappa Agonist Molecules at 2014 American Academy of Pain Management Meeting 2Nektar Presents Positive Preclinical Data on Oral, Peripherally-Acting Kappa Agonist Molecules at 2014 American Academy of Pain Management Meeting 3Nektar Presents Positive Preclinical Data on Oral, Peripherally-Acting Kappa Agonist Molecules at 2014 American Academy of Pain Management Meeting 4Nektar Presents Positive Preclinical Data on Oral, Peripherally-Acting Kappa Agonist Molecules at 2014 American Academy of Pain Management Meeting 5Latest Research on Cereal Grain Quality, Health Benefits and Food Production to be Presented During the AACC International Annual Meeting 2Latest Research on Cereal Grain Quality, Health Benefits and Food Production to be Presented During the AACC International Annual Meeting 3House passage of high-tech manufacturing bill is move toward stronger economy, say SPIE leaders 2House passage of high-tech manufacturing bill is move toward stronger economy, say SPIE leaders 3
... , , , ... 8 Peregrine Pharmaceuticals, Inc. (Nasdaq: PPHM ) today ... bavituximab in combination with carboplatin and paclitaxel in advanced breast cancer ... enrolled and patients are currently undergoing treatment and follow-up. The ...
... , , ATLANTA and BRIDGEWATER, N.J. ... pollen, as parents prepare for this year,s back to school they should ... nasal allergies ease into the new school year, the My Xperts(TM) program, ... a team of indoor and outdoor nasal allergy experts to help parents ...
... , NOVATO, Calif., Sept. 8 BioMarin Pharmaceutical Inc. (Nasdaq: ... of BioMarin, will present a company update at the Morgan Stanley Healthcare ... p.m. ET. , , Interested parties may ... section of the BioMarin website, www.BMRN.com . A ...
Cached Biology Technology:Peregrine Pharmaceuticals Reports Advances in Bavituximab Clinical Program 2Peregrine Pharmaceuticals Reports Advances in Bavituximab Clinical Program 3Peregrine Pharmaceuticals Reports Advances in Bavituximab Clinical Program 4Peregrine Pharmaceuticals Reports Advances in Bavituximab Clinical Program 5VIDEO: Nasal Allergy Experts Offer Free Advice for Back to School Sneezin' 2VIDEO: Nasal Allergy Experts Offer Free Advice for Back to School Sneezin' 3VIDEO: Nasal Allergy Experts Offer Free Advice for Back to School Sneezin' 4VIDEO: Nasal Allergy Experts Offer Free Advice for Back to School Sneezin' 5VIDEO: Nasal Allergy Experts Offer Free Advice for Back to School Sneezin' 6BioMarin to Present at the Morgan Stanley Healthcare Conference 2
Anti-Indolamine (Indoleamine) 2,3-dioxygenase Immunogen: Recombinant human IDO. Available Date: 38454...
Anti-Ephrin B1 Host: rabbit polyclonal Species Reactivity: human Applications: WB Storage: 4C...
Human Regulatory T cell Staining Kit #2 (w/ APC Foxp3 PCH101, FITC CD4, PE CD25)...
...
Biology Products: