Navigation Links
Old growth giants limited by water-pulling ability
Date:8/11/2008

CORVALLIS, Ore. The Douglas-fir, state tree of Oregon, towering king of old-growth forests and one of the tallest tree species on Earth, finally stops growing taller because it just can't pull water any higher, a new study concludes.

This limit on height is somewhere above 350 feet, or taller than a 35-story building, and is a physiological tradeoff between two factors in the tree's wood - a balance between efficiency and safety in transporting water to the uppermost leaves.

The findings are being published this week in Proceedings of the National Academy of Sciences, by a team of scientists from Oregon State University and the U.S.D.A. Forest Service. The research was funded by grants from the U.S. Department of Agriculture and the Forest Service.

"People have always been fascinated by how some trees, such as Douglas-fir or redwoods, can grow so tall," said Barb Lachenbruch, a professor of wood science at Oregon State University. "This is not an easy thing to do. Think about trying to drink water through a narrow, 350-foot-long straw. It takes a lot of suction."

Douglas-fir wood consists mostly of dead cells called "tracheids" that function in water transport and physical support, the researchers said. These tracheids have pits on their sides that function as valves, allowing water to go from one tracheid to the next, and the pits have a membrane with an impermeable middle. Normally, water flows through the porous edges of the membrane, but if there's an air bubble in one tracheid, the membrane moves to the side and blocks off the pit so air bubbles can't spread.

Although it's important to allow water to pass efficiently from one wood cell to the next, air bubbles would block water movement altogether. Because water is pulled through a tree by the forces of evaporation from the leaf surfaces, the water is in "tension," like a pulled rubber band. If an air bubble gets in, it's like the rubber band breaking
'/>"/>

Contact: Barb Lachenbruch
barb.lachenbruch@oregonstate.edu
541-737-4213
Oregon State University
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. BIO-key(R) Reports Profitability on Strong Revenue Growth for Second Quarter 2008
2. [video] Michael DePasquale, CEO of BIO-key International, Inc., Discusses Q2 2008 Revenue Growth on WallSt.nets 3-Minute Press Show
3. BIO-key(R) Reports Profitability on Strong Revenue Growth for Second Quarter 2008
4. Embryo biopsy does not affect early growth and risk of congenital malformations in PGD/PGS babies
5. Growth hormones link to starvation may be clue to increasing life span, researchers find
6. Blue light used to harden tooth fillings stunts tumor growth
7. Scientists find potential protein biomarkers for growth hormone
8. Synthetic cocoa chemical slows growth of tumors in human cell lines
9. NYU dental professor discovers biological clock linking tooth growth to other metabolic processes
10. T-cadherin affects blood vessel growth in breast cancer, hormone from fat cells may play a role
11. Faster koa tree growth without adverse ecosystem effects
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/11/2014)... July 11, 2014--Researchers at the Department of Energy,s ... 100 awards, presented by R&D Magazine in recognition ... "These awards recognize the tremendous value of our ... "Research and development at the National Labs continues ... and pursue the scientific and technological innovations necessary ...
(Date:7/11/2014)... awarded Michael F. Holick, PhD, MD, of Boston University ... Avioli Award. Holick, a professor of medicine, physiology and ... understanding of vitamin D and its role in disease ... the American Society for Bone and Mineral Research (ASBMR) ... It is named for ASBMR,s first president and founding ...
(Date:7/11/2014)... USC Stem Cell scientists have set a "mouse TRAP" ... described by a recent study published in the ... line uses a technique called TRAP to extract cellular ... , Invented by scientists at the Rockefeller Institute for ... tag to the protein-making machinery, or ribosomes, of the ...
Breaking Biology News(10 mins):ORNL wins eight R&D 100s 2ORNL wins eight R&D 100s 3ORNL wins eight R&D 100s 4BUSM's Michael F. Holick receives American Society for Bone and Mineral Research award 2
... United States have autoantibodies, which are proteins made by ... define a condition known as autoimmunity, a study shows. ... of the most common type of autoantibody, known as ... is highest among women, older individuals, and African-Americans. The ...
... estimated to be seven billion and all these mouths ... of fish stocks in our seas fish farming is ... issues about maintaining the health of stock and how ... Central,s open access journal BMC Microbiology demonstrates ...
... evolution of pigmentation patterns on mollusk seashellswhich could ... proved to be a challenging feat for researchers. ... of Pittsburgh and University of California, Berkeley, researchers ... sea snail Conus to generate a ...
Cached Biology News:NIH study shows 32 million Americans have autoantibodies that target their own tissues 2Titanium dioxide film enhances the sun's natural disinfection power 2Breakthrough model reveals evolution of ancient nervous systems through seashell colors 2
(Date:7/11/2014)... 11, 2014 Cayenne Medical, Inc., ... in the soft tissue reconstruction segment, announced the ... for surgeries involving the shoulder and extremities. The ... novel, inserter-controlled deployment method. The unique delivery eliminates ... anchor pull-out, or anchor displacement (also commonly know ...
(Date:7/10/2014)... Boston, Mass. (PRWEB) July 10, 2014 ... , today announced that Alan Swahn, a former vice ... Terascala’s executive team as vice president of marketing. Terascala’s ... from Dell and NetApp create the highest performance and ... has been appointed to guide Terascala’s channel expansion and ...
(Date:7/10/2014)... Calabasas, CA (PRWEB) July 10, 2014 ... academic institutions and professional associations, addressed the challenges of ... & Medical Device Industries” through strategic sourcing. Describing the ... ) with the Supply Chain Management Institute ( SCMI) ... the event on June 24 at the Kroc Institute ...
(Date:7/10/2014)... Research and Markets ( http://www.researchandmarkets.com/research/s3bqj2/photonic ) ... Photonic Integrated Circuit (Monolithic Integration, Hybrid Integration, Module ... to their offering. ... integration traces its roots in the latter half ... integration went unexplored and unfulfilled for several decades ...
Breaking Biology Technology:Cayenne Medical Launches SureLock™ All-Suture Anchor System for Shoulder and Extremity Surgery 2Cayenne Medical Launches SureLock™ All-Suture Anchor System for Shoulder and Extremity Surgery 3Terascala Expands Executive Team 2Terascala Expands Executive Team 3Biotech & Biopharm Supply Chain Management Executives Launch BSMA in San Diego 2Biotech & Biopharm Supply Chain Management Executives Launch BSMA in San Diego 3Biotech & Biopharm Supply Chain Management Executives Launch BSMA in San Diego 4International Photonic Integrated Circuit (Monolithic Integration, Hybrid Integration, Module Integration) Market - Forecasts to 2019 2
... Jan. 28 Tissue Genesis, Inc., an emerging ... American Medical Systems Holdings, Inc. (Nasdaq: AMMD ) announced ... development of adipose (fat)–derived regenerative cells for use in treating ... million over the life of the agreement to obtain ...
... MADRID , Jan. 28 The 2009 BBVA ... to physicist and chemist Richard N. Zare , of ... the University of Maryland , for their independent, fundamental contributions ... of nature,s building blocks and the underlying interactions between them by ...
... , ... , , ... today,that Scopus Custom Data, the underlying source of Scopus.com, the world,s,largest abstract ... citation linkage analysis between scientific,articles and patents. JST, as the funding agency ...
Cached Biology Technology:American Medical Systems and Tissue Genesis Sign $1.1 Million Collaboration Deal 2American Medical Systems and Tissue Genesis Sign $1.1 Million Collaboration Deal 3American Medical Systems and Tissue Genesis Sign $1.1 Million Collaboration Deal 4Zare and Fisher Win the BBVA Foundation Frontiers of Knowledge Award in Basic Sciences for Rendering Molecules Visible and Analyzing Their Collective Behavior 2Zare and Fisher Win the BBVA Foundation Frontiers of Knowledge Award in Basic Sciences for Rendering Molecules Visible and Analyzing Their Collective Behavior 3Zare and Fisher Win the BBVA Foundation Frontiers of Knowledge Award in Basic Sciences for Rendering Molecules Visible and Analyzing Their Collective Behavior 4Zare and Fisher Win the BBVA Foundation Frontiers of Knowledge Award in Basic Sciences for Rendering Molecules Visible and Analyzing Their Collective Behavior 5Zare and Fisher Win the BBVA Foundation Frontiers of Knowledge Award in Basic Sciences for Rendering Molecules Visible and Analyzing Their Collective Behavior 6Zare and Fisher Win the BBVA Foundation Frontiers of Knowledge Award in Basic Sciences for Rendering Molecules Visible and Analyzing Their Collective Behavior 7Japan Science and Technology Agency (JST) Selects Scopus Custom Data for Citation Linkage Analysis Between Scientific Articles and Patents 2Japan Science and Technology Agency (JST) Selects Scopus Custom Data for Citation Linkage Analysis Between Scientific Articles and Patents 3Japan Science and Technology Agency (JST) Selects Scopus Custom Data for Citation Linkage Analysis Between Scientific Articles and Patents 4Japan Science and Technology Agency (JST) Selects Scopus Custom Data for Citation Linkage Analysis Between Scientific Articles and Patents 5Japan Science and Technology Agency (JST) Selects Scopus Custom Data for Citation Linkage Analysis Between Scientific Articles and Patents 6
... 10 ,Yeast extract, 5 ,Sodium chloride, ... ammonium citrate, 0.5 ,IPTG, 0.03 ... autoclavable chromogenic substrate for -galactosidase. The ... generates a black insoluble precipitate. Lac+ ...
S-100 alpha/beta chain (8B10)...
SCCRO (S-17)...
... is a nucleoside antibiotic ... is a potent translational ... and eukaryotic cells. Resistance ... by the products of ...
Biology Products: