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Why leaves change color

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by

Jenna Schreiber

on 12 November 2015

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Transcript of Why leaves change color

How leaves can change color
Three factors that influence autumn are leaf color-leaf pigments, length of night, and weather
Trees respond to the decreasing amount of sunlight by producing less and less chlorophyll
A severe drought can delay the arrival of fall colors by a few week
How does it work?
During the spring and summer, chlotophyll is continually being made, and leaves are green
As nights get longer in the fall, chlorophyll making slows down and then stops eventually all the chlorophyll is gone.
Then the color and leaves start to show by carotenoids and anthocyanins
Weather effects colors
In warm days more sugars are produced rather than freezing days
Carotenoids are always present in leaves
The amount of moisture in the soil affects autumn color
Early frost will end the colorful foliage.
During a drought cancause the abscission layer to form early and cause the leaves to drop before they change color.


Why leaves change color
By:Jenna Schreiber
What triggers leaves to fall
The veins that carry fluids into and out of the leaf gradually close off
Then a layer of cells forms at the base of each leaf
The clogged veins trap sugars and makes the production of anthocyanins
Anthocyanins mean water-soluble vacuolar pigments that may appear red, purple, or blue depending on the pH
Full transcript