Navigation Links
Going out on a (redwood tree) limb
Date:6/28/2010

ydrostatic tension."

"Some data are worth going out on a limb for," Oldham jokes.

Water stress increases with height in a tree's canopygravity pulls down on the water column, which in turn decreases water pressure as you move up the tree. To compensate for this decreased water pressure with increasing height, trees make anatomical changes in leaves which can lead to a reduction in photosynthesis in the upper canopy. Of the variables the authors measuredleaf length, leaf width, and the amount of air space (or mesoporosity) in a leafall decreased with height (explaining decreasing photosynthesis with height) while leaf thickness and transfusion tissue (which improve water-stress tolerance) increased with height. In contrast, none of the 15 anatomical traits measured differed between the inner and outer crown positions, where light availability differed.

"In tall redwoods its not light that drives leaf anatomy and morphology, but rather a height-associated increase in water stress due to the force of gravity pulling down on the water column as it rises over 110 m from the roots to the tree top," Oldham explains. "This gravitational pressure, known as hydrostatic tension, decreases water availability with height and so directly reduces leaf expansion which in turn lowers photosynthetic capacity in the tree tops. At the same time, hydrostatic tension puts tall trees at increased risk during drought events thus driving investments in functional anatomical traits that may allow redwoods to reach such great heights, but are costly in terms of lost opportunity for growth."

Oldham notes that "For Earth's tallest trees the force of gravity may be the biggest obstacle to further increases in height." With increasing height, the increasing effects of gravity drive tissue investments toward water stress tolerance, resulting in tradeoffs with carbon gain per unit leaf mass in the upper crown. This could result in diminishing rates of height g
'/>"/>

Contact: Richard Hund
rhund@botany.org
314-577-9557
American Journal of Botany
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Going live with click chemistry
2. National Zoo scimitar-horned oryx going into the wild
3. 70 years old and going strong with Down syndrome and no dementia
4. How mirror neurons allow us to learn and socialize by going through the motions in the head
5. New infant feeding and obesity research adds insight to ongoing issue
6. Lobster traps going high tech
7. Going bananas for sustainable research -- scientists create fuel from African crop waste
8. A heart healthy diet and ongoing, moderate physical activity may protect against cognitive decline
9. WPI receives $1.3 million in federal awards for ongoing research in the life sciences
10. Going green on hold: Man-made activities can affect blue haze, worlds weather
11. Ongoing human evolution could explain recent rise in certain disorders
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Going out on a (redwood tree) limb
(Date:8/12/2015)... MINNETONKA, Minn. , Aug. 12, 2015   ... that supports the entire spectrum of clinical research, is ... ™ , the company,s comprehensive SaaS-based eClinical technology platform, ... growth during the first two quarters of 2015.   ... and second largest quarters measured by contract value sold ...
(Date:8/10/2015)... and TELTOW, Germany , August 10, ... (SMI), a world leader in Eye Tracking Technology for ... its OEM Eye Tracking Platform for integration into all ... contains reference designs for seamless integration of eye tracking ... reality HMDs and augmented reality smart glasses. Omnivision,s leading ...
(Date:8/5/2015)... 2015 According to a new ... Software, Services, Vertical (BFSI, Airport, IT & Telecom, Utilities, ... Forecast to 2020", published by MarketsandMarkets, defines and segments ... various segments. The global PIAM Market is estimated to ... by 2019, at a CAGR of 14.9 % from ...
Breaking Biology News(10 mins):MedNet Solutions Experiences Explosive Corporate Growth 2SMI Completes OEM Eye Tracking Platform to Cover All Consumer Displays 2SMI Completes OEM Eye Tracking Platform to Cover All Consumer Displays 3Physical Identity and Access Management Market Worth $546.2 Million by 2019 2Physical Identity and Access Management Market Worth $546.2 Million by 2019 3Physical Identity and Access Management Market Worth $546.2 Million by 2019 4
... DIEGO (August 3, 2009) La Jolla Institute for ... play a role in allergy onset, instead have discovered ... may be important in myeloproliferative diseases and some types ... of disorders characterized by an overproduction of blood cells ...
... organisms evolve from a single cell, a fertilised egg. In ... development is determined. It is dictated by the separation of ... from the remaining cells, which will be responsible for forming ... somatic cell line. Scientists at the Institute for Research in ...
... 2009 The intake of added sugars in the United ... in 1999-2002 as 17% of calories a day. Consuming foods ... or limiting intake of added sugars is an important objective ... 30,000 Americans published in the August 2009 issue of the ...
Cached Biology News:La Jolla Institute discovers novel tumor suppressor 2La Jolla Institute discovers novel tumor suppressor 3Protecting cells from their neighbors 2Race/ethnicity, family income and education associated with sugar consumption 2
(Date:9/2/2015)... , September 2, 2015 ... BOLT) ("BioLight" or the "Company"), a firm that ... ophthalmology and cancer diagnostics, announced today that presentations ... glaucoma will be delivered at the Ophthalmology Futures ... European Society of Cataract & Refractive Surgeons ("ESCRS"), ...
(Date:9/2/2015)... ... 02, 2015 , ... Whitehouse Laboratories is excited to announce ... Resources upcoming educational seminar and training session on Extractable & Leachable testing. Featuring ... provide Updates & Case Studies on the Latest Compliance Implications of USP and ...
(Date:9/1/2015)... , September 2, 2015 ... primär auf die Forschung und Entwicklung neuartiger ... Allergien, chronisch-entzündliche Darmerkrankungen und Reizdarm konzentriert, erhält ... Zusage, dass sein neues Medikament patentiert wird. ... das Allergien bei Kindern verhindert und Entzündungen ...
(Date:9/1/2015)... Sept. 1, 2015 Prostate cancer ... in American men. One in seven men will ... new cases are diagnosed annually. That said, not ... a powerful new technique, MRI Fusion Biopsy, to ... cancer lesions, treating only the affected areas and ...
Breaking Biology Technology:Presentations to Highlight BioLight's IOPtiMate[TM] System at Upcoming European Ophthalmology Conferences 2Presentations to Highlight BioLight's IOPtiMate[TM] System at Upcoming European Ophthalmology Conferences 3Whitehouse Laboratories to Participate in Pharm Ed Resources Extractables, Leachables, & Elemental Impurities Educational Seminar 2Whitehouse Laboratories to Participate in Pharm Ed Resources Extractables, Leachables, & Elemental Impurities Educational Seminar 3Das Patent von Swecure zur Verhinderung von Allergien bei Kindern wird in den USA zugelassen 2September Is Prostate Cancer Awareness Month 2September Is Prostate Cancer Awareness Month 3September Is Prostate Cancer Awareness Month 4
... ST. LOUIS, Oct. 16 ISTO Technologies, Inc., ... data,related to its NuQu(TM) injectable cell-based therapy for ... Canada at the 23rd Annual,Meeting of the North ... of California San Francisco (UCSF) Department of Orthopedics,were ...
... ATLANTA, Oct. 16 CryoLife, Inc. (NYSE: CRY ... that third quarter 2008 financial results will be released ... teleconference call and,live webcast at 10:00 a.m. Eastern Time, ... question and answer session hosted by Steven G.,Anderson, president ...
... The acquisition will solidify China Biologic,s position as the ... -- Company provides preliminary guidance for 2009 of ... $100 million and ... CITY, Shandong, China, Oct. 16 /Xinhua-PRNewswire-FirstCall/ --,China Biologic Products, ...
Cached Biology Technology:Positive Preclinical Data on Cell Therapy for Spinal Disc Repair Presented at 23rd Annual Meeting of the North American Spine Society 2CryoLife Announces Release Date and Teleconference Call Details for Third Quarter 2008 Financial Results 2China Biologic Products Enters Into Agreement to Acquire 35% Interest in Xi'an Huitian Blood Products Co., Ltd. and Introduces Preliminary Guidance for 2009 2China Biologic Products Enters Into Agreement to Acquire 35% Interest in Xi'an Huitian Blood Products Co., Ltd. and Introduces Preliminary Guidance for 2009 3China Biologic Products Enters Into Agreement to Acquire 35% Interest in Xi'an Huitian Blood Products Co., Ltd. and Introduces Preliminary Guidance for 2009 4China Biologic Products Enters Into Agreement to Acquire 35% Interest in Xi'an Huitian Blood Products Co., Ltd. and Introduces Preliminary Guidance for 2009 5
... optically clear polystyrene formulation , High antibody-binding ... , Plates are certified for performance ... , Eight-well strips fit snugly in ... in use even if turned upside down ...
...
... StabilZyme SELECT Stabilizer is an aqueous ... and other non-toxic stabilizing chemicals in a ... contains a combination of 0.02% methylisothiazolone and ... SELECT Stabilizer is a diluent and stabilizer ...
... is a bovine protein-free alternative to StabilCoat ... solution that contains non-toxic chemicals in a ... - 7.2, and does not contain a ... of antibodies and other biomolecules that are ...
Biology Products: