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Why Do Leaves Turn Colour?

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Why Do Leaves Turn Colour?

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27-Jan-2004	#1
Greggles bonsaiTALK Expert Join Date: Jan-2004 USDA Zone: 10 sydney AHS Heat Zone: ? Posts: 199	Why Do Leaves Turn Colour? Does someone know why leaves turn colour red, orange, yellow and all sorts of colours? I understand that the auxins and the cala-somethings move up and down the tree...but what causes the leaf to turn colour? __________________ "And the LORD God made all kinds of trees grow out of the ground-trees that were pleasing to the eye and good for food." - Genesis 2:9

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27-Jan-2004	#2
TreeBay Tips:5¢ Advice:Free *MODERATOR GROUP* Join Date: Aug-2001 Location: Silicon Valley Country: USA USDA Zone: 9 AHS Heat Zone: 4 Posts: 9,742	Here are a couple bonsaiTALK Links on the subject. Now your assignment is to read them and come back and tell us why leaves change color! http://www.bonsaitalk.com/links/cgi-bin/jump.cgi?ID=882 http://www.bonsaitalk.com/links/cgi-bin/jump.cgi?ID=960 __________________ Want to be a seller on bonsaiAUCTIONS? Get authorized today! bonsaiTALK: Over 100,005.36 Megabytes Served this Month!

27-Jan-2004	#3
Greggles bonsaiTALK Expert Join Date: Jan-2004 USDA Zone: 10 sydney AHS Heat Zone: ? Posts: 199	ohhhh...I get it!!! man..that's sooo interesting!! ok..in a sentence...here we go! Leaves turn colour because the leaves stop producing food. (hmm..need more sentences...) There is a chemical in the leaf called chlorophyll. the chlorophyll breaks down and reveals the rest of the chemicals (which are not green). So techinically...when I see leaves changing colours, that means those leaves have stopped producing and the "plant food" is going downwards? __________________ "And the LORD God made all kinds of trees grow out of the ground-trees that were pleasing to the eye and good for food." - Genesis 2:9

27-Jan-2004	#4
Carl_Bergstrom Old Mister Crow Join Date: May-2002 Location: Seattle, WA. Country: USA USDA Zone: 8 AHS Heat Zone: 2 Posts: 3,197	Much as I hate to see my interest in bonsai converging upon my work life, some of you might be interested in reading about a recent scientific hypothesis for autumn color. To understand the argument, you may find this background to be useful. Best regards, Carl __________________ In love with trees

27-Jan-2004	#5
Greggles bonsaiTALK Expert Join Date: Jan-2004 USDA Zone: 10 sydney AHS Heat Zone: ? Posts: 199	ohhh..that's a really interesting hypothesis!! Yea! that means..if it's true, I can build a shade room out of red or yellow shade material and the aphids will avoid it! hahaha __________________ "And the LORD God made all kinds of trees grow out of the ground-trees that were pleasing to the eye and good for food." - Genesis 2:9

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