Autumn colors - a photo on Flickriver

Autumn colors

            But as autumn approaches, certain influences both inside and outside the plant cause the chlorophylls to be replaced at a slower rate than they are being used up. During this period, with the total supply of chlorophylls gradually dwindling, the "masking" effect slowly fades away. Then other pigments that have been present (along with the chlorophylls) in the cells all during the leaf's life begin to show through. These are carotenoids they give us colorations of yellow, brown, orange, and the many hues in between. 

The reds, the purples, and their blended combinations that decorate autumn foliage come from another group of pigments in the cells called anthocyanins. These pigments are not present in the leaf throughout the growing season as are the carotenoids. They develop in late summer in the sap of the cells of the leaf, and this development is the result of complex interactions of many influences - both inside-and outside the plant. Their formation depends on the breakdown of sugars in the presence of bright light as the level of a certain chemical (phosphate) in the leaf is reduced. 

But in the fall, phosphate, along with the other chemicals and nutrients, moves out of the leaf into the stem of the plant. When this happens, the sugar-breakdown process changes, leading to the production of anthocyanin pigments. The brighter the light during this period, the greater the production of anthocyanins and the more brilliant the resulting color display that we see. When the days of autumn are bright and cool, and the nights are chilly but not freezing, the brightest colorations usually develop.

Taken on: October 25, 2015

Tags:

floating

autumn

canon5dmark3

sigma12-24

Netherlands

castle

Renswoude

late-autumn

colors

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Groups appears in: • Groupe Charlie 04

Camera: Canon EOS 5D Mark III, f/25.0, 0.3 sec, 17mm, ISO 250 (more info) (hide info)

Camera:	Canon EOS 5D Mark III
Lens:	12-24mm
Aperture:	f/25.0
Exposure Time:	0.3
Focal Length:	17mm
ISO:	250
Exposure Bias:	0 EV
Flash:	Off, Did not fire
Exposure Program:	Manual
Exposure Mode:	Manual
Metering Mode:	Multi-segment
White Balance:	Auto
Color Space:	Uncalibrated
Software:	Adobe Photoshop Camera Raw 9.2 (Windows)
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