Low Temperature-Induced GA3 Sensitivity of Wheat

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Abstract
GA3 sensitivity (measured as .alpha.-amylase production) of the isolated aleurone tisue/deembryonated seed of wheat (T. aestivum L.) cv. Kite and cv. Aroona each containing either one of the dwarfing genes, Rht1 and Rht2, was increased significantly as a result of low temperature treatment. The magnitude of the low temperature-induced increase occurred without any change in the lag time of .alpha.-amylase production. This low temperature induction of GA3 sensitivity was operative in aleurone tissue of only those varieties having at least one of the 3 Rht alleles. It is likely, therefore, that the low temperature effect which cures or circumvents the genetic lesions manifest in the Rht1 and Rht2 genotypes is the same as that efective in the Rht3-containing genotype and probably involves an increase in hormone (GA3) receptor sites. This increase apparently is a quantitative temporal one.