Navigation Links
Why are autumn leaves red in America and yellow in Europe?
Date:8/13/2009

Walking outdoors in the fall, the splendidly colorful leaves adorning the trees are a delight to the eye. In Europe these autumn leaves are mostly yellow, while the United States and East Asia boast lustrous red foliage. But why is it that there are such differences in autumnal hues around the world? A new theory provided by Prof. Simcha Lev-Yadun of the Department of Science Education- Biology at the University of Haifa-Oranim and Prof. Jarmo Holopainen of the University of Kuopio in Finland and published in the Journal New Phytologist proposes taking a step 35 million years back to solve the color mystery.

The green of a tree's leaves is from the larger proportion of the chlorophyll pigment in the leaves. The change in color to red or yellow as autumn approaches is not the result of the leaves' dying, but of a series of processes which differ between the red and yellow autumn leaves. When the green chlorophyll in leaves diminishes, the yellow pigments that already exist become dominant and give their color to the leaves. Red autumn leaves result from a different process: As the chlorophyll diminishes, a red pigment, anthocyanin, which was not previously present, is produced in the leaf. These facts were only recently discovered and led to a surge of research studies attempting to explain why trees expend resources on creating red pigments just as they are about to shed their leaves.

Explanations that have been offered vary and there is no agreement on this as of yet. One discipline suggests that the red pigment is produced as a result of physiological functions that make the re-translocation of amino acids to the woody parts of the tree more efficient in setting up its protection against the potential damage of light and cold. Other explanations suggest that the red pigment is produced as part of the tree's strategy for protecting itself against insects that thrive on the flow of amino acids. But whatever the answer is, these explana
'/>"/>

Contact: Rachel Feldman
rfeldman@univ.haifa.ac.il
972-482-88722
University of Haifa
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Why do autumn leaves bother to turn red?
2. Losing more than we gain from autumn warming in the north
3. Understanding autumn rain decline in SE Australia
4. Aquaculture concept leaves judges goggle eyed
5. From Canada to the Caribbean: Tree leaves control their own temperature, Penn study reveals
6. When leaves fall, more is occurring than a change of weather
7. A win-win: U-pick pumpkin farms recycle urban leaves
8. The hepatitis healing power of blueberry leaves
9. American Chemical Societys Weekly PressPac -- Aug. 8, 2007
10. Understanding hypertension in African Americans proves elusive
11. CU-Boulder team discovers first ancient manioc fields in Americas
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/17/2014)... Professor Luca Razzari of the nergie Matriaux Tlcommunications ... from the John R. Evans Leaders Fund of ... acquisition of state-of-the-art biotech and nanophotonics equipment. To ... the Ministre de l,Enseignement suprieur, de la Recherche, ... These new laboratories will help us develop new ...
(Date:4/17/2014)... MANHATTAN, KAN. A Kansas State University engineer ... security and remotely detects improvised explosive devices. The ... , William Dunn, the Steven M. and Kay ... of mechanical and nuclear engineering, and his research ... explosives hidden underground or in car trunks. The ...
(Date:4/17/2014)... . If a ... him, he can expect his premises to be trashed. Warnings ... consequences is enough to make restaurant owners pay up. Similarly, ... eggs in other birds, nests. If the host birds throw ... by destroying the entire nest. Consequently, it is beneficial for ...
Breaking Biology News(10 mins):New state-of-the-art biotech and nanotech equipment for INRS 2Patented research remotely detects nitrogen-rich explosives 2Fear of the cuckoo mafia 2Fear of the cuckoo mafia 3
... help to protect against some food allergies. Kefir, a traditional ... food, and is often used to wean babies, as it ... children under the age of three, with around 5-8% of ... the problematic food. , "Friendly" bacteria in kefir may play ...
... Small but remarkable fossils found in New Zealand will prompt a ... the so-called "land of birds" was once home to mammals as ... and a leg - belonged to a unique, mouse-sized land animal ... St Bathans fossil bed, in the Central Otago region of South ...
... Columbia University's Mailman School of Public Health, the Centers ... Research Center have discovered a key mechanism by which ... identification of an amino acid sequence in Filoviruses that ... described in the December 2006 issue of The FASEB ...
Cached Biology News:Friendly bacteria in alcoholic milkshake could fight food allergies 2Tiny bones rewrite textbooks 2Researchers discover key mechanism by which lethal viruses Ebola and Marburg cause disease 2
(Date:1/15/2014)... Freeslate, Inc ., the leading provider ... Limited, one of India’s top five pharmaceutical companies, has ... for high throughput solid form screening. , ... wide range of quality, affordable generic and branded formulations ...
(Date:1/14/2014)... Date: Friday, April 11, 2014 , Time: ... 1360 Almshouse Road, Warrington, Pa. , Details: The ... to finding a cure for hepatitis B and improving the ... annual Crystal Ball on Friday, April 11 at Warrington Country ...
(Date:1/14/2014)... Communications, a leading provider of strategic communications services to corporations and ... the United States and Europe ... JD, is returning to the firm,s Washington, D.C. ... more than two years of service as Associate Commissioner for the ...
(Date:1/14/2014)... Jan. 14, 2014 The largest international professional ... plants and therapeutic derivatives thereof has endorsed an ... researchers about the challenges of adulterated herb and ... The Society for Medicinal Plant ...
Breaking Biology Technology:Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 2Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 3Hepatitis B Foundation to Host Annual Crystal Ball Gala 2Former FDA Associate Commissioner Returns To 3D Communications 2World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 2World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 3World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 4World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 5World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 6World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 7World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 8
... ... three Fast Track SBIR grants from the National Institutes of Health to develop original in ... model the reaction rates of DNA and RNA experiments. , ... (Vocus) July 22, 2009 -- DNA Software, Inc. has been ...
... , PHILADELPHIA, July 22 ERT (Nasdaq: ... ePRO, and other services to the biopharmaceutical, medical device, and related ... Management, Tammy Miller. Ms. Miller will report to the Executive Vice ... Miller will be responsible for the global implementation and delivery of ...
... GOTHENBURG, Sweden, July 22 Cellectricon, a ... discovery,today announced its collaboration with University of Lodz, Poland. ... world,s first,system for high throughput transfection enabling reagent-free delivery ... To view the Multimedia News Release, please click: ...
Cached Biology Technology:DNA Software, Inc. Awarded $2.5 M in NIH Funding to Develop Pioneering Nucleic Acid-based Technologies 2DNA Software, Inc. Awarded $2.5 M in NIH Funding to Develop Pioneering Nucleic Acid-based Technologies 3DNA Software, Inc. Awarded $2.5 M in NIH Funding to Develop Pioneering Nucleic Acid-based Technologies 4ERT Appoints New Vice President of Project Management 2ERT Appoints New Vice President of Project Management 3University of Lodz Invests in the Unique Cellaxess(R)HT System for Research on Multidrug Resistance Genes in Cancer 2
Phospho- (Ser) 14-3-3 Binding Motif (4E2) Mouse mAb...
Rat polyclonal to acetyl Salicylic Acid ( Abpromise for all tested applications)....
Drugs and NO-drug Rat Anti-conjugated Acetyl Salicylic Acid Polyclonal Antibody...
Rabbit polyclonal to UBC12 (rating: ****) ( Abpromise for all tested applications). Antigen: Synthetic peptide: RGGYIGSTYFER, corresponding to amino acids 169-180 of UBC12 Entrez Gene ID: 90...
Biology Products: