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

How tall can a tree grow? Does sunlight or water limit the size and photosynthetic capacity of a leaf? Could constraints on leaf growth really determine the height of a tree? These are all questions that Alana Oldham of Humboldt State University, CA, was eager to answer as she and her colleagues dangled from an ancient redwood tree well over a football field's length in height above the ground.

Most trees, and many other plants, have thicker leaves on the top of their canopies with wider, more expanded leaves below. This difference in "sun" vs "shade" leaves is usually explained as an adaptation to different levels of light availability within the plants' crown. However, Oldham and her collaborators set out to investigate whether water stress might play an equal or more important role than light availability on the variation in top to bottom leaf anatomy in one of the tallest plants on earth, the redwood tree (Sequoia sempervirens). They published their novel findings in the July issue of the American Journal of Botany (http://www.amjbot.org/cgi/reprint/ajb.0900214v1).

In order to separate the effects of light from water potential the authors collected data on a range of morphological and anatomical variables in leaves using a paired design, sampling from the inner and outer crown of each of five redwood trees at increasing height positions.

"This is the first time plant anatomists have collected height-paired leaf samples from both the inner and outer crowns of trees of significant height," Oldham notes. "Accessing the outermost branch tips in trees of this size requires risky techniques that have taken many years for more experienced canopy researchers than I to learn and develop. Only by obtaining leaves that grew at the same height in the tree but in different light environments could we separate the effects of light availability from those of h
'/>"/>

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:8/27/2014)... the greatest risk to Europe based upon a proxy ... researchers using a ,big data, approach to scientific research. ... and Global Health ranked the top 100 pathogens affecting ... a system which, they believe, will help governments across ... of infectious diseases, including as a result of climate ...
(Date:8/27/2014)... . , Charcot-Marie-Tooth ... affecting the peripheral nervous system. Researchers from the Department ... Medicine and University Medical Centre Gttingen have discovered that ... with the disease. These cells enwrap the nerve fibres ... the rapid transfer of electrical impulses. If Schwann cells ...
(Date:8/27/2014)... basic research, a growing focus on translating discoveries ... have earned the Herbert Irving Comprehensive Cancer Center ... NewYork-Presbyterian Hospital an $18 million, five-year Cancer Center ... The grant renews the center,s status as one ... New York City and one of only three ...
Breaking Biology News(10 mins):Big data approach identifies Europe's most dangerous human and domestic animal pathogens 2Potential therapy for incurable Charcot-Marie-Tooth disease 2Herbert Irving Comprehensive Cancer Center awarded $18 million grant 2Herbert Irving Comprehensive Cancer Center awarded $18 million grant 3Herbert Irving Comprehensive Cancer Center awarded $18 million grant 4
... vast majority of patients who had a successful ... need mitral valve surgery three years after their ... of the left ventricle (commonly known as reverse ... the Cardiovascular Research Foundations (CRF) nineteenth annual Transcatheter ...
... D.C. October 24, 2007 - The U.S. Senate ... Appropriations Bill (S.1710), including a provision that directs the ... Access Policy by requiring rather than requesting participation by ... House Appropriations Bill, which contains a similar provision, in ...
... Germany-October 24, 2007-Harvard University,s Office of Technology Development ... jointly establish the BASF Advanced Research Initiative. ... and Applied Sciences (SEAS) the initiative will benefit ... throughout the University. Set up as a ...
Cached Biology News:New data shows benefits of MitraClip for patients with mitral regurgitation 2New data shows benefits of MitraClip for patients with mitral regurgitation 3Mandate for public access to NIH-funded research poised to become law 2BASF and Harvard University announce extensive research collaboration 2
(Date:8/27/2014)... Aug. 27, 2014 Tris Pharma, a specialty ... today announced that it has been selected as an ... Association,s 2014 Awards for Excellence competition in ... independent panel of judges from SCORE (Counselors to America,s ... will be honored at a gala event to be ...
(Date:8/27/2014)... 27, 2014 After the boom of ... the next beverage craze is going to be the ... formulators can use Stress Relief energy pattern which can ... making of a beverage, including minerals, herbs and liquids. ... channeling that power into rapid recovery and helping to ...
(Date:8/27/2014)... WriteResult, LLC – a premier provider of ... superiority when it comes to meeting the needs of ... of their most recent study closeout on-time and with ... digital writing platform to collect Patient Reported Outcomes electronically ... drew data from a number of assessments including the ...
(Date:8/26/2014)... ANGELES , Aug. 26, 2014  NeuroSigma, Inc., ... company established to develop bioelectronic technologies, today announced that ... with the U.S. Securities and Exchange Commission relating to ... The number of shares to be offered and the ... been determined. Jefferies LLC will act as ...
Breaking Biology Technology:Tris Pharma Selected as an award winner in the New Jersey Business & Industry Association's 2014 Awards for Excellence 2Stress Relief: 1 Way to De-Stress Your Beverage Formula 2Stress Relief: 1 Way to De-Stress Your Beverage Formula 3Stress Relief: 1 Way to De-Stress Your Beverage Formula 4A Perfect Record: WriteResult Maintains a 100% On-Time ePRO Record with Latest Irritable Bowel (IBS) Study Data Lock 2
... noses modeled after biological olfaction, the challenge has been ... requisite combinatorial complexity to detect odors in the real ... be manufactured with exact chemical precision and reproducibility. , ... open-access journal PLoS Biology, Joel White, Mary AtKisson, John ...
... Fla., Jan. 22 The Delaware Court of,Chancery today ... brought by a,stockholder of Cryo-Cell International Inc. (OTC Bulletin ... of stockholders held,on July 16, 2007. The court ordered ... a special stockholders meeting to be held on March ...
... Hospitals and healthcare,institutions are challenged to devise ... take place while maintaining Environment of Care,(EC) ... these challenges is,available for download at: ... "Infection Control in the Healthcare,Environment During Construction," ...
Cached Biology Technology:Special Stockholders Meeting to Elect Directors Set for March 4, 2008 2White Paper Details Infection Control Challenges Hospitals Must Address During Construction 2