HOME >> BIOLOGY >> NEWS
Old leaves need to die in time or they will bring a plant down

In a study from the November issue of The American Naturalist, researchers Alex Boonman and co-workers from the Netherlands show that it is beneficial for plants growing in a dense stand to shed their oldest, lower leaves once these become shaded. By using transgenic tobacco plants that do not shed their lower leaves, they were able to show that shaded old leaves become a burden to a plant because they no longer photosynthesize but still require energy to be maintained.

Moreover, the nutrients in these leaves can be more usefully employed by the plant when re-allocated to new leaves at the top of the canopy, where more light is available and higher photosynthetic rates can be attained. Previously, theoretical modeling has been extensively used to investigate how plants should distribute their leaf area and nutrients to maximize their photosynthesis and fitness. However, a direct experimental test was lacking till now.

"Keeping up with the neighbors is important for plants in leaf canopies" Alex Boonman states, "because failure to project enough leaf area at the top of the canopy means that some other plant will do it, with shading and therefore diminished photosynthesis as the consequence." The transgenics, which were originally developed by Susheng Gan and Richard Amasino at the University of Wisconsin, indeed produced less leaf area in the upper canopy layer than normal plants and performed less well in competition exeriments.


'"/>

Contact: Suzanne Wu
swu@press.uchicago.edu
773-834-0386
University of Chicago Press Journals
1-Nov-2006


Page: 1

Related biology news :

1. Speechless and Mute help break the silence of the leaves
2. Ghost protein leaves fresh tracks in the cell
3. Researchers discover way to transport environmental arsenic to plant leaves in new clean-up strategy
4. Tree of Life project grows more leaves and branches
5. Life leaves subtle signature in the lay of the land
6. Conversion of flower organs into leaves
7. MIT study: Maturity brings richer memories
8. Variant CJD -- Prion amplification breakthrough brings new insights and hopes for a blood test
9. Extracting eggs from pre-pubertal cancer patients brings hope for future fertility
10. Discovery could help bring down price of DNA sequencing
11. US conservation efforts bring more marine turtles to UK

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:12/25/2018)... ... 2018 , ... Researchers at the Icahn School of Medicine ... a long-standing computational concept known as “blacklisting,” which is commonly employed as a ... as a filter to single out genetic variations in patient genomes and exomes ...
(Date:12/19/2018)... ... December 19, 2018 , ... OrthoSpace Ltd. ... Arthroscopy evaluating the use of novel surgical techniques, including the OrthoSpace ... represent a painful, disabling condition for which there are historically few treatment options. ...
(Date:12/13/2018)... ... ... Study Protocol Summary of QC Procedure , 1 – Patient Enrolment (with ... the site., 3 - Three photos captured with Apple iPad and transferred to each ... Photos moved to eAdjudication® and submitted to Reviewers., 6 - Reviewers (blinded) repeats ...
Breaking Biology News(10 mins):
(Date:1/10/2019)... ... ... adopted from a local shelter when he was around two years old. According to ... after he was adopted, he tore his right cruciate ligament. Though he had his ... a traumatic injury. , Sure enough, when Rascal was about nine years old, he began ...
(Date:1/8/2019)... ... 08, 2019 , ... The American Society of Gene and Cell Therapy’s ... selection committee made up of industry leaders identified by the ASGCT board of directors. ... awards created to support ASGCT members designing transformative pilot studies in gene and cell ...
(Date:1/4/2019)... ... January 02, 2019 , ... CellMax Life ... cells in blood, has been named as a partner in Medigen Biotech’s upcoming ... cell therapies for cancer treatment, will use CellMax Life’s circulating tumor cell platform ...
(Date:12/19/2018)... FREDERICK, Md. (PRWEB) , ... December 19, 2018 ... ... solutions for Life Science, announces the validated release of Limfinity® version 7.1. The ... another important technical offering from RURO as 2018 comes to an end. , ...
Breaking Biology Technology:
Cached News: