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:8/6/2015)... Calif. , Aug. 6, 2015  Today, ... will visit Crossmatch ™ to learn firsthand ... and protect data. Crossmatch is a world leader ... technologies and expertise are helping federal agencies and ... and security.   "The vast majority ...
(Date:8/5/2015)... ALBANY, New York , August 5, 2015 /PRNewswire/ ... new market report titled "Facial Recognition Market - Global ... - 2022", the global market for facial recognition is ... market is driven by increased demand for surveillance systems ... to the rising number of crimes and terrorist activities ...
(Date:8/3/2015)... Aug. 3, 2015 Synaptics, Inc. (Nasdaq: ... today announced that members of the executive management team ... Crest Global Technology Leadership Forum on Tuesday, August 11, ... be held at the Sonnenalp Resort in ... may include forward-looking information. An audio webcast of the ...
Breaking Biology News(10 mins):Rep. Honda to Visit Crossmatch in Redwood City 2Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 2Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 3Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 4Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 5Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 6
... OH (October 26, 2009) Inspired by recent breakthroughs ... announced a major fundraising initiative entitled Research to Reality: ... earmarked to accelerate the progress of crucial research, and ... Black, whose niece Courtney lost her battle with Rett ...
... Millions of children in the United States between the ages ... vitamin D, according to a large nationally representative study published ... an editorial. The study, led by Jonathan Mansbach, ... of vitamin D levels in U.S. children. It builds on ...
... The remarkable eyes of a marine crustacean could inspire ... a new study from the University of Bristol published today ... the study are found on the Great Barrier Reef in ... science. They can see in twelve colours (humans see ...
Cached Biology News:IRSF receives $1 million matching gift 2IRSF receives $1 million matching gift 3Latest analysis confirms suboptimal vitamin D levels in millions of US children 2Mantis shrimps could show us the way to a better DVD 2
(Date:8/27/2015)... , Aug. 27, 2015  Neogen Corporation (NASDAQ: ... the stock of United Kingdom -based ... microbiological culture media and diagnostic systems. ... into a leading provider of microbial testing and diagnostic ... testing markets. The company currently sells into more than ...
(Date:8/27/2015)... CELEBRATION, Fla. , Aug. 27, 2015 ... announced that a patient,s eyes—and life—were saved by doctors ... , working with NNFF, NovaBay Pharmaceuticals and Dr. ... Wound Care Center at Seton Medical Center in ... The successful treatment used a breakthrough approach, pioneered by ...
(Date:8/27/2015)... Inc. (TSXV: BRM) ("Biorem" or "the Company") today announced its results ... complete second quarter financial statements and MD&A have been filed on ... per shareThree-months ended , Six -months endedJune 30 , June 30 ... 2014 Revenue , 4,709 , 2,459 ... 1,656 , 56 , 3,188 , ...
(Date:8/27/2015)... , August 27, 2015 GlassesOff ... image processing functions in the human vision system, announced today ... point guard Chris Paul to develop a ... who want to improve their real-life on-court performance. ... court, whether it is shooting a ball or blocking a ...
Breaking Biology Technology:Neogen acquires U.K.-based Lab M Holdings 2Patient's Life and Eyes Saved from Gruesome Flesh-Eating Infection Consuming Her Face 2Patient's Life and Eyes Saved from Gruesome Flesh-Eating Infection Consuming Her Face 3BIOREM Reports $718,000 Net Earnings for the Second Quarter 2BIOREM Reports $718,000 Net Earnings for the Second Quarter 3Eight-Time All-Star Chris Paul and GlassesOff Partner to Develop Innovative Mobile App Designed to Improve On-Court Performance 2Eight-Time All-Star Chris Paul and GlassesOff Partner to Develop Innovative Mobile App Designed to Improve On-Court Performance 3
... biological agents that could be used for bioterrorist attacks has ... OpGen Inc. , a Madison based bio-informatics company that ... of the most infectious bacteria, Francisella tularensis, is a causative ... or deer fever. The bacterium is naturally found in rodents, ...
... MADISON, Wis. -- Third Wave Technologies Inc. ... of Pathology (AFIP) has selected the company's Invader ... genetic screening. , ,AFIP, the central reference laboratory for ... Department of Veterans Affairs, will use Invader to screen ...
... leader in the total number of business incubators located ... for new job creation as well, according Thomas Lyons, ... who recently addressed an audience at the Wisconsin ... the MGE Innovation Center , a business incubator ...
Cached Biology Technology:OpGen Database Helps to Reduce Bioterrorist Threat 2Armed Forces Institute of Pathology Adopts Third Wave's Invader Screen 2Business Incubators Grow Economy and Jobs 2Business Incubators Grow Economy and Jobs 3
... Mini thermal cycler is a compact instrument for ... ml tubes, 12 x 0.5 ml tubes, or ... uses a thumbwheel to adjust height and pressure ... Peltier heat pumps provide excellent thermal performance, and ...
... Dyad thermal cycler is a flexible ... chassis accommodates a variety of interchangeable ... hold different types and numbers of ... with point-and-click navigation. Peltier heat pumps, ...
MiniCycler thermal cycler with Hot Bonnet heated lid, holds 25x0.2ml tubes...
For demonstration of Helicobacter pylori...
Biology Products: