A Revision of the Hormone Balance Theory of Seed Dormancy: Studies on Gibberellin and/or Abscisic Acid-Deficient Mutants of Arabidopsis thaliana
The basic framework of the hormone theory of seed dormancy originates from Luckwill , who suggested that the dormancy of apple seeds depends on the interaction between naturally occurring growth-inhibiting and growth-promoting substances. In later years, the interaction has often been described as a balance between simultaneously occurring promotive hormones, such as gibberellins (GAs) and cytokinins, and the inhibitory hormone, abscisic acid (ABA). It has been pointed out that the theory is mainly based on the effects of exogenous growth regulators on germination and dormancy, in which dormancy can be maintained, imposed and released by these chemicals singly or in combination . Such effects are considered to reflect the action of naturally occurring hormones within seeds. Environmental factors, such as light and temperature conditions, are thought to operate on dormancy by causing changes in the balance between promotors and inhibitors.
KeywordsGerminate Fluores Prep Gibberellin
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