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A Gain-of-Function Mutation in IAA28 Suppresses Lateral Root Development
Luise E. Rogg, Jamie Lasswell and Bonnie Bartel
The Plant Cell
Vol. 13, No. 3 (Mar., 2001), pp. 465-480
Published by: American Society of Plant Biologists (ASPB)
Stable URL: http://www.jstor.org/stable/3871400
Page Count: 16
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The phytohormone auxin is important in many aspects of plant development. We have isolated an auxin-resistant Arabidopsis mutant, iaa28-1, that is severely defective in lateral root formation and that has diminished adult size and decreased apical dominance. The iaa28-1 mutant is resistant to inhibition of root elongation by auxin, cytokinin, and ethylene, but it responds normally to other phytohormones. We identified the gene defective in the iaa28-1 mutant by using a map-based positional approach and found it to encode a previously uncharacterized member of the Aux/IAA gene family. IAA28 is preferentially expressed in roots and inflorescence stems, and in contrast to other Aux/IAA genes, IAA28 transcription is not induced by exogenous auxin. Studies of the gain-of-function iaa28-1 mutant suggest that IAA28 normally represses transcription, perhaps of genes that promote lateral root initiation in response to auxin signals.
The Plant Cell © 2001 American Society of Plant Biologists (ASPB)