Saturday, April 28, 2012

The Red Dragon

In spring time the world fills with green budding sprouts, new leaves, and bright flowers. But here in San Francisco a popular tree is budding that breaks the mold. Commonly called the Red Dragon or Japanese Maple tree this fiery redhead is in a class all her own.

A beautiful upward shot of a glowing Red Dragon via CodePoet5150
 Actually from New Zealand, the Red Dragon has long been prized for its unique leaf coloration, and humans have taken it with them around the world. But the more we see them around San Francisco the more we have been wondering: why? We all learned in school that plants have a green pigment called chlorophyll which is integral to photosynthesis, turning sunlight into energy the plant can use. The Times sums it up nicely here:
"Green plants... in their own simple and mysterious way utilize the energy of sunlight to convert carbon dioxide and water into food. Chief agent in this process of photosynthesis is chlorophyll, the green coloring-matter in leaves, which acts as a catalyst, speeding up the transformation, but undergoing no conversion itself."
This  trees bright red existence challenges our logic  - no green pigment equals  no photosynthesis right? How could that be?  They grow just like every other plant. So the chlorophyll must be hiding under a mix of other pigments in the leaves. And in fact with a bit of research this is what we find.

"The green colour of chlorophyll is simply being masked by one of a number of other pigments not involved in photosynthesis, including flavins and carotenoids, which are present in abundance in certain species of plant.
Carotenoids are yellow and orange (they give carrots their orange colour...) or orange/red in colour, so probably contribute to the red colour of leaves, but the richness of the red colour is provided by flavins. These are a group of photoreceptor chemicals which absorb blue wavelengths of light from the spectrum ... and emit all other wavelengths, making the pigment appear red."
A Red Dragon leaf shiny after a rain via car 67
With their challenged ability to directly expose their chlorophyll to sunlight the Japanese Maple has a much slower growth rate than their green siblings. In an unprotected natural setting, the trees would rarely thrive.   Horticulturists have carefully nurtured this beautiful species placing them in  settings where the competition for light is minimal as the inch their way toward maturity.

The colors around us reveal exciting questions if we just take a moment to see them!

- Emily Eifler, Writer, Colour Studio
- Jill Pilaroscia, Principal, Colour Studio

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