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Comparison of IAA-Induced and Low Temperature-Induced GA3 Responsiveness and α-Amylase Production by GA3 Insensitive Dwarf Wheat Aleurone 1

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Abstract

Rht3-containing gibberellic acid (GA3) insensitive deembryonated wheat (Triticum aestivum L. var Cappelle Desprez × Minister Dwarf) aleurone, that can be made responsive to GA3 by low temperature, can also be rendered GA3 sensitive by preincubation with indoleacetic acid (IAA). The IAA-induced response of the dwarf selection is concentration-dependent, relatively sensitive, and similar in magnitude to that induced by low temperature. Other auxins also induce GA3 responsiveness to a greater or lesser degree. IAA has no apparent effect on the wild type (rht, tall) selection.

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