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GrainGenes Reference Report: PNA-72-892

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Reference	PNA-72-892
Title	Genetic control of endosperm amylase activity and gibberellic acid responses in standard-height and short-statured wheats.
Journal	Proceedings of the National Academy of Sciences, USA
Year	1975
Volume	72
Pages	892-895
Author	Fick GN Qualset CO
Type	Article
Abstract	In contrast to standard-height wheat genotypes, short-statured wheats having major genes for dwarfness do not show increased seedling growth after treatment with gibberellic acid. Endogenous gibberellic acid induces synthesis of amylase in the endosperm of germinating seeds, but the amount of amylase synthesized is greatly increased by exogenous gibberellic acid treatment in standard-height and in short-statured wheats that have dwarfing genes from the variety 'Norin 10'. 'D6899', which has the 'Tom Thumb' gene for height reduction, had about one-fourth of the amylase activity of standard-height and Norin 10-derived, short-statured wheats. This genotype showed little or no increased amylase activity after gibberellic acid treatment. Genetic analyses showed that the amount of amylase synthesized was controlled by a single gene and was dependent on the number of copies of the structural gene present in the endosperm. Dwarfism in wheat may be related to a blockage in gibberellic acid utilization because other workers have found that the amount of endogenous amylase synthesized in Norin 10-derived, short-statured wheats is not growth-limiting, but it is not known if low amylase synthesis is related to dwarfism in the Tom Thumb derivative. No recombinants were recovered in a small population, suggesting that the Tom Thumb gene may pleiotropically affect plant height and the lack of response to gibberellic acid in amylase synthesis and seedling growth.
External Databases	DOI: 10.1073/pnas.72.3.892
Gene Class	Gibberellic acid insensitivity
Cited in	McIntosh RA et al. (2013) Catalogue of Gene Symbols for Wheat- 2013 Edition Catalogue of Gene Symbols for Wheat.

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