Indole-3-Butyric Acid Induces Ectopic Formation of Metaxylem in the Hypocotyl of Arabidopsis thaliana without Conversion into Indole-3-Acetic Acid and with a Positive Interaction with Ethylene.

The treatment with IAA caused a highly significant ( p < 0.0001) increase in pericycle periclinal proliferation in comparison with HF ( Figure 3 A), however only ectopic protoxylem was formed ( Figure 2 E) and the AR number did not increase significantly ( Figure 3 B).

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