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1 February, 02:54

What molecules that allows plants to tell how bright light is and which direction it comes from?

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  1. 1 February, 03:16
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    Auxin is the molecule which is related to the phototropism of the plants. In the mutant plants, which do not have hormone auxin, do not respond to light. It activates proton pump, and leads to the decrease in the pH of the leaf. This acidification breaks cell wall structure and cell wall become less rigid, and thus, can bend towards the light, by exerting mechanical pressure.
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