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  Re: [Aroid-l] Philodendron Shift in Leaf Morphology
From: "Tom Croat" <Thomas.Croat at mobot.org> on 2009.10.07 at 03:05:01(20163)
Dear Phil:

I suspect that it is auxin controlled. As you may imagine younger
plants grow scototropically one assumes because they have to find a
tree, rock or wall. Once there they stop growing horizontally and grow
upward, effectively toward the light, rather than away from the light.
Therefore is is logical that there is an auxin conrol the makes this
change of coarse. As the plants get closer to the source of light the
internodes get shorter and broader reflecting this more favorable site
for developing into an adult plant.


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