Nurturing Life Sciences
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#Unit 6. System Physiology – Plant
Experiment on coleoptile phototropism
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Paál and Went experiment
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A common feature of all active auxins is a molecular distance of about 0.5 nm between a fractional positive charge on the aromatic ring and a negatively charged carboxyl group.
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Structure of three natural auxins
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Indole-3-acetic acid (IAA) occurs in all plants, Peas, for example, contain 4-chloroindole-3-acetic acid. Mustards and corn contain indole-3- butyric acid (IBA).
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Structure of synthetic auxin, most synthetic auxins are used as herbicides in horticulture and agriculture.