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

and water can no longer be transported. With a 350-foot-long water column, there's a lot of tension on the water in the cells at the top of the tree, and a lot of force trying to get errant air bubbles to enter.

"Higher and higher in the tree, the valves are able to withstand more pulling force from the long heavy column of water before air bubbles can be sucked through," Lachenbruch said. "But the problem is that the valves become less efficient at letting water pass. The height at which no water would pass at all, according to our models, coincides the tallest records for Douglas-fir, about 350 to 400 feet."

Trees of that height were discovered in Washington and British Columbia in the late 19th and early 20th centuries. The tallest Douglas-fir today is a 326-foot-tall tree in Coos County, Oregon.

"As you go higher and higher in a Douglas-fir tree, it's almost like experiencing a drought," said Rick Meinzer, a Forest Service scientist at the Pacific Northwest Research Station. "And that's what we see at the tops of very tall trees. The foliage is struggling to get enough water and seems to be under drought stress. It's not unusual to see periodic die-back at the tops of very tall Douglas-fir trees that are near their height limits."

At a specific height determined by the physical structure of these pits and their membranes, the scientists discovered, the fierce resistance put up by the Douglas-fir to prevent any spread of air bubbles also prevents water from being pulled any higher. That is where it finally stops growing in height, no matter how favorable any other conditions might be, such as climate, soil or water availability.

The studies, Meinzer said, may improve our understanding of how trees grow in height and may be able to adapt to different environments, including their ability to deal with droughts or climate change.

Although height can be important in a competition for sunlight and photosynthesi
'/>"/>

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:7/9/2015)... DUBLIN , July 07, 2015 ... has announced the addition of the "Biometrics ... and Forecasts 2015-2020" report to their offering. ... a major contributor to this growth and the ... US$5.5 billion in revenue for companies involved in ...
(Date:7/9/2015)... , July 9, 2015  Synaptics Inc. ... of human interface solutions, today announced a ... first fully hardware encapsulated fingerprint sensor and ... technology is literally off the grid, isolating ... matching within the fingerprint sensor to provide ...
(Date:7/8/2015)... FRANKLIN LAKES , N.J. and NEW YORK ... and Company) and Guidepoint today announced ... selected start-up healthcare companies with free access to Guidepoint,s ... mentoring several start-ups that are developing cutting-edge technologies to ... of a dedicated Guidepoint research manager, each start-up entrepreneur ...
Breaking Biology News(10 mins):Global Banking Biometrics Market 2015-2020 - Market & Technology Analysis, Adoption Strategies and Forecasts 2Global Banking Biometrics Market 2015-2020 - Market & Technology Analysis, Adoption Strategies and Forecasts 3Synaptics Announces World's First Match-in-Sensor Fingerprint Authentication Technology 2Synaptics Announces World's First Match-in-Sensor Fingerprint Authentication Technology 3BD and Guidepoint Team to Connect Healthcare Start-up Companies With Business and Scientific Experts 2BD and Guidepoint Team to Connect Healthcare Start-up Companies With Business and Scientific Experts 3
... Louis, MO Women who have a history of ... of gaining an inappropriate amount of weight during pregnancy. ... of the Journal of the American Dietetic Association, ... Chapel Hill report that restrained eating behaviors prior to ...
... ends, the cell usually kills itself to stem the genetic damage. ... suicide and start down the path to cancer. Details ... treat cancer. The new study of fruit flies is the ... the end of a chromosome can lead to many abnormalities ...
... it is the overall Silver Winner in this year,s ... the Semiconductors,category., By understanding the auditory pathway -- ... cortex -- Audience is the first company to,deliver a ... (ASA), or the grouping and processing of complex mixtures ...
Cached Biology News:New study indicates link between weight gains during pregnancy and dieting history 2When cells go bad 2When cells go bad 3When cells go bad 4Audience Selected as Silver Winner in This Year's Wall Street Journal Technology Innovation Awards and Winner of the Semiconductors Category 2
(Date:7/29/2015)... 2015  AsureQuality and Ubiquitome have agreed to ... in food and primary production sectors. The collaboration ... device, the Freedom4. AsureQuality provides quality ... supermarket shelf for producers, processors and Competent Authorities ... disease control and pest management and surveillance programmes. ...
(Date:7/29/2015)... 2015  AmnioChor Inc., an early stage biotech startup ... to announce that the Musculoskeletal Transplant Foundation of ... in their seed round of development of the proprietary ... AmnioChor,s technology allows cryopreservation of the ... cells living within those tissues. Amnion is a well-established ...
(Date:7/29/2015)... ... ... The third Medical Innovation Impact Index (MI3) Alert considers FDA processes for the ... system received a score of 0 (range -10 to +10) for its impact on ... Dickinson University’s ( FDU ) Rothman Institute of Innovation and Entrepreneurship. Several changes to ...
(Date:7/29/2015)... ... July 29, 2015 , ... CSSi LifeSciences™ formalized ... specializing in Clinical Trial Management. CSSi LifeSciences is specialized in strategic, marketing, and ... PRC Clinical is focused on Clinical Trial Management, Clinical Site Monitoring, and Clinical ...
Breaking Biology Technology:AsureQuality and Ubiquitome Partner on Applications for Mobile Molecular Food Safety Testing 2The Musculoskeletal Transplant Foundation Agrees to Invest in AmnioChor 2Third Medical Innovation Impact Index Issued by Fairleigh Dickinson University’s Initiative for Patient-Centered Innovation (iPCI) 2Third Medical Innovation Impact Index Issued by Fairleigh Dickinson University’s Initiative for Patient-Centered Innovation (iPCI) 3CSSi LifeSciences And PRC Clinical Join Forces To Offer Extended Clinical Trial Services 2CSSi LifeSciences And PRC Clinical Join Forces To Offer Extended Clinical Trial Services 3
... Oct. 14 LI-COR Biosciences introduces a,new, novel ... Odyssey(R),Infrared Imaging system. The Odyssey Two-Color Protein Molecular ... and 800 nm channels of the,Odyssey System. The ... can be used to visualize the progress of ...
... GenVault Corporation today,announces that Mr. Mark Sutherland ... Business Development. Mr. Sutherland will be responsible for,finding, ... the company,s products and technologies as well as ... has more than 25 years experience in life ...
... business into three distinct divisions that include in vitro ... ... pharmaceuticals, TUSTIN, Calif., Oct. 14 ( http://www.amdl.com ),AMDL, Inc. ... in China and the US, today announced it has restructured,its business ...
Cached Biology Technology:LI-COR Introduces the Odyssey(R) Two-Color NIR Fluorescent Protein Molecular Weight Marker 2Mark Sutherland Joins GenVault as Senior Vice President, Business Development 2AMDL, Inc. Announces Strategic Realignment 2AMDL, Inc. Announces Strategic Realignment 3
... The Cellject Uno Electroporator is a ... producing optimum efficiencies in bacterial and ... selects one of two voltages and ... four mm cuvettes. On pressing the ...
Request Info...
The Cellject Elecroporator is suitable for all cell types including embryo, mammalian, plant, yeast and bacterial. Its has highly user-freindly programing and can be used remotely, for example in a l...
Maxi 14 Hybridization Oven. 14 bottle (35 mm) rotisserie + shaker tray available for simultaneous use. Includes linear and orbital shaker trays, 4 medium bottles, pack of mesh, bottle gripper and d...
Biology Products: