Talk:Phototropism
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[edit] Phototropic effects in plant cell
As in the article mentioned, chloroplasts move to the edge of the cell when light intensity is high and more creative to the centre when there's low intensity. Shouldn't it be reversed? Because at the edge chloroplasts will receive way more light! Bas M, nl.wikipedia
[edit] opening sections
I was going to add this as a third paragraph and final sentence. Is my last sentence true?
"Phototropism is enabled by auxins. Auxins are plant hormones that have many functions. In this respect, auxins are responsible for expelling H+ ions which decreases pH in the cells on the dark side of the plant. This acidification of the cell wall region activates enzymes known as expansins which break bonds in the cell wall structure, making the cell walls less rigid. The decrease in cell wall strength causes cells to swell, exerting the mechanical pressure that drives phototropic movement.
So it is not so much that plants grow towards light, but that they grow away from dark." —The preceding unsigned comment was added by 65.78.26.80 (talk) 16:43, 29 April 2007 (UTC).
Chloroplasts actually move to the sides of the cell and basically stack up during high light intensity. as far as I understand it they do this horizontally to the light they receive, thus making the mesophyll cell more transparent and preventing as much light absorbtion. This protects from photo-oxidative damage which occurs under high light conditions. Sorry if this is in the wrong place or something. this is the first time I've ever said something on wikipedia.99.149.118.108 (talk) 22:40, 8 April 2008 (UTC)
