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:12/22/2014)... , Dec. 22, 2014  NXT-ID, Inc. (NASDAQ: ... a biometric authentication company focused on the growing mobile ... and security consultant, Apollo Robbins for the ... wallet.  Apollo Robbins will ... th , 2015, demonstrating some of his famous theft ...
(Date:12/19/2014)... 2014 Research and Markets ( http://www.researchandmarkets.com/research/86ncd6/micro_market ... Market Monitor: North America Perimeter Security Systems Market" ... http://photos.prnewswire.com/prnh/20130307/600769 The North American perimeter security ... 3.6% from 2014 to 2019. Although the U.S. market ... Canada is expected to grow at a ...
(Date:12/17/2014)... Va. , Dec. 15, 2014 ... to make it easier to detect and prevent ... Today the agency started performing an ... capability will validate the authenticity of purchased microcircuits ... The new quality control measures will be conducted ...
Breaking Biology News(10 mins):NXT-ID Hires Master Pickpocket and Security Consultant Apollo Robbins for Wocket Smart Wallet CES 2015 Debut 2NXT-ID Hires Master Pickpocket and Security Consultant Apollo Robbins for Wocket Smart Wallet CES 2015 Debut 3NXT-ID Hires Master Pickpocket and Security Consultant Apollo Robbins for Wocket Smart Wallet CES 2015 Debut 4Micro Market Monitor: North America Perimeter Security Systems Market (Intrusion Detection Sensor, Video Surveillance, Communication/Alarm and Notification, Access Control System) 2Micro Market Monitor: North America Perimeter Security Systems Market (Intrusion Detection Sensor, Video Surveillance, Communication/Alarm and Notification, Access Control System) 3Defense Logistics Agency Launches DNA Marking Capability to Strengthen Microcircuit Supply Chain 2Defense Logistics Agency Launches DNA Marking Capability to Strengthen Microcircuit Supply Chain 3
... An accidental discovery in a laboratory at Oregon State University ... has absorbed the energies of ancient Egyptians, the Han dynasty ... a near-perfect blue pigment. Through much of recorded human ... could be used to paint things blue, often with limited ...
... are a serious threat to human society. They are also ... at the University of Gothenburg are attempting to find substances ... ensure that the drugs of today remain effective into the ... particularly serious in drugs against fungi. Fungal cells are similar ...
... This release is available in German . ... in the cells of their victim in order to ,reprogram, them. ... live, making lots of new viruses instead. Luckily, in ... ensured by the cells, own sensors that recognise alien genetic material. ...
Cached Biology News:Accidental discovery produces durable new blue pigment for multiple applications 2Slowing evolution to stop drug resistance 2Study shows link between influenza virus and fever 2
(Date:12/22/2014)... VIEJO, Calif. , Dec. 22, 2014  ( ... that CoPatient, an online medical bill review and advocacy ... offering in the FREE WellCard Savings discount health services ... medical bill that was more than they expected to ... members reduce health care costs, WellCard Savings is pleased ...
(Date:12/22/2014)... 22, 2014 ITRA Global, one of ... of commercial real estate, has further expanded its global ... Perth and Brisbane, Western Australia, reports Mylinda Vick, CCIM, ... ITRA Global / ACORPP (Australian Corporate Property and ... company providing property services to a wide range of ...
(Date:12/19/2014)... OR and Hershey, PA (PRWEB) December 19, 2014 ... Pink: BJCT), a leading developer and manufacturer of ... entered into an agreement with Immunomic Therapeutics, Inc. ... Biojector®-2000 needle-free injection device with its LAMP™ vaccine ... an option for an exclusive Worldwide license to ...
(Date:12/19/2014)... 19, 2014 BioPlus Specialty Pharmacy ... announces the promotion of Nick Maroulis, Pharm.D. to the ... Services. , In this position, Dr. Maroulis will ... managing the directors of our multi-site pharmacies as the ... 1997 and during that time he has served in ...
Breaking Biology Technology:WellCard Savings Announces CoPatient Medical Bill Review Service for Members 2ITRA Global Continues International Expansion in Perth and Brisbane, Australia 2Bioject and Immunomic Therapeutics Enter into an Agreement for License of Needle-Free Technology for LAMP-vax Vaccines 2Bioject and Immunomic Therapeutics Enter into an Agreement for License of Needle-Free Technology for LAMP-vax Vaccines 3BioPlus Specialty Pharmacy Promotes Dr. Nick Maroulis to Vice President of Specialty Pharmacy Services 2
... and AALST , Belgium, AHMEDABAD, India and ... genae associates,Cardiovascular Center Aalst and J.B. Dahm, ... Core Laboratories joint venture, called imaeon., ... of medical images,analysis for clinical research projects, ...
... EDMONTON, Oct. 6 /PRNewswire-FirstCall/ - BioMS Medical ... of multiple sclerosis (MS), today,announced that the independent ... II MINDSET-01 trial of dirucotide (MBP8298) in patients,with ... recommended,that the trial continue as per the protocol., ...
... focus on a new dietary supplement resulting from years of, ... ... Del-Immune V, BOULDER, Colo., Oct. 6 On ... regulatory,cytokines Del-Immune V(R) induction and its impact on cytotoxicity of,natural killer cells" ...
Cached Biology Technology:Core Laboratories Joint Venture Agreement Between genae associates, VIBGYOR Scientific Research, Cardiovascular Center Aalst and J.B. Dahm 2BioMS Medical's relapsing-remitting multiple sclerosis trial receives positive review from Data Safety Monitoring Board 2EUPROBIO 2008 Presentation to Highlight Latest Immune Research 2
... The S. pombe Whole Genome ... location analysis of yeast (S. pombe) ... immunoprecipitation (ChIP) with Agilent DNA microarrays. ... reliable binding data with greater true ...
... is designed for easy transformation of the ... for successful transformation simply by mixing a ... cultured yeast cells. No complicated steps, such ... The kit is particularly well suited for ...
... rapid analytical to medium scale affinity purification ... vectors. Sufficient reagents are provided for purification ... under native or denaturing conditions. Crude samples ... retains STag fusion proteins. After unbound proteins ...
Request Info...
Biology Products: