The effects of indole-3-acetic acid (IAA) and the auxin transport inhibitors 2, 3, 5-triiodobenzoic acid (TIBA) and 1-N-naphthylphthalamic acid (NPA) on the style curvature of Alpinia platychilus, A. blepharocalyx, and A. mutica were studied. Exogenous IAA stimulated the style curvature movement of the anaflexistylous morph (ana-morph) and cataflexistylous morph (cata-morph) of three Alpinia species in light, but had no effect in the dark. Treatment with auxin efflux inhibitors (NPA and TIBA) before flower opening did not affect the first curvature of the two morphs in darkness; however, the subsequent second movement of the ana-morph was enhanced by NPA or TIBA, while the second movement of the cata-morph was completely inhibited. After the first curvature, NPA and TIBA treatments at 06:00 hours (before significant illumination) and 11:00 hours (after the styles were illuminated for 4 h) increased the second curvature of the ana-morph, but significantly decreased that of the catamorph. The effect at 06:00 hours was more significant than the effect at 11:00 hours. These results suggested that auxin and auxin transport affected the style curvature in a different way in the two morphs, and two morphs had distinct mechanisms for style movement at different times.
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