Physiological characteristics of two auxin-resistant mutants of Arabidopsis thaliana,aux-2 and Dwf |
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Authors: | Javed I Mirza E Paddy Maher |
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Institution: | (1) Department of Genetics, University of Aberdeen, AB9 2TN Aberdeen, UK;(2) Present address: Institute of Pure and Applied Biology, B.Z. university, Multan, Pakistan;(3) Present address: The Open University in Scotland, 60 Melville Street, Edinburgh, UK |
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Abstract: | Two auxin-resistant mutants of Arabidopsis thaliana L. have been characterized physiologically: aux-2 is a recessive mutation and is unlinked to a dominant mutation, Dwf, which is apparently lethal when homozygous. The progeny of selfed Dwf plants segregate into Dwf (agravitropic) and dwf
+ (normal) phenotypes.
aux-2 phenotype was indistinguishable from the wild-type on criteria other than resistance to exogenous auxins: 3-fold to 2,4-D and 2-fold to IAA. On the other hand, Dwf plants had a typical dwarf phenotype with single unbranched roots which lacked hairs. Compared to the wild-type, Dwf seedling roots were highly resistant to exogenous auxins: 2000-fold to 2,4-D and 360-fold to IAA. Both aux-2 and Dwf were normal in their response to exogenous ABA. The dwarf phenotype was insensitive to gibberellins but root hair formation was restored by application of auxins.The results indicate that altered auxin phsysiology can lead to agravitropism and dwarfism.Abbrevations ABA
Abscisic acid
- GA3
Gibberellic acid
- IAA
indole-3-acetic acid
- 2,4-D
2,4-dichlorophenoxyacetic acid |
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Keywords: | agravitropism auxin-resistance dwarfism |
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