plb04 - Sarah Abdul, 2008 Plant Physiology Class, Arizona...

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Sarah Abdul, 2008 Plant Physiology Class, Arizona State University, The Hormonal and Genetic Basis of Stem Growth in Tall and Dwarf Varieties of Peas. The discovery of gibberellins resulted from studies with exaggerated elongation of internodes of fungal infected rice stems. Abundant endogenous gibberellins in peas and other species are thought to be responsible for tall phenotype of wild varieties. Dwarf varieties are mutants that either fail to respond to the gibberellins hormone, so they are unable to produce gibberellins. This hypothesis was tested using the wild type Alaska variety of the pea and dwarf mutant Little Marvel. The Alaska variety of the peas is tall, based on the experimental data, because they have receptors to the gibberellin hormone. They also produce an abundance of endogenous gibberellins. From the data, it is also clear that the genetic basis of dwarfism of the little marvel variety is simply the inability to respond to gibberellin hormones, and in turn do not produce gibberellins. Therefore,
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This note was uploaded on 04/23/2008 for the course PHY 111 taught by Professor Cavatto during the Spring '08 term at ASU.

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plb04 - Sarah Abdul, 2008 Plant Physiology Class, Arizona...

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