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AXR1 acts after lateral bud formation to inhibit lateral bud growth in Arabidopsis

Stirnberg, P., Leyser, O. and Chatfield, S.P. (1999) AXR1 acts after lateral bud formation to inhibit lateral bud growth in Arabidopsis. Plant Physiology. pp. 839-847. ISSN 0032-0889

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Abstract

The AXR1 gene of Arabidopsis is required for many auxin responses. The highly branched shoot phenotype of mature axr1 mutant plants has been taken as genetic evidence for a role of auxin in the control of shoot branching. We compared the development of lateral shoots in wild-type Columbia and axr1-12 plants. In the wild type, the pattern of lateral shoot development depends on the developmental stage of the plant. During prolonged vegetative growth, axillary shoots arise and develop in a basal-apical sequence. After floral transition, axillary shoots arise rapidly along the primary shoot axis and grow out to form lateral inflorescences in an apical-basal sequence. For both patterns, the axr1 mutation does not affect the timing of axillary meristem formation; however, subsequent lateral shoot development proceeds more rapidly in axr1 plants. The outgrowth of lateral inflorescences from excised cauline nodes of wild-type plants is inhibited by apical auxin. axr1-12 nodes are resistant to this inhibition. These results provide evidence for common control of axillary growth in both patterns, and suggest a role for auxin during the late stages of axillary shoot development following the formation of the axillary bud and several axillary leaf primordia.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 1999 American Society of Plant Physiologists
Keywords: PHASEOLUS-VULGARIS-L, SHOOT APICAL MERISTEM, AUXIN-RESISTANT MUTANTS, CELL-LINEAGE PATTERNS, INFLORESCENCE DEVELOPMENT, CORRELATIVE INHIBITION, INDOLEACETIC-ACID, PLANT DEVELOPMENT, EXOGENOUS AUXIN, ABSCISIC-ACID
Academic Units: The University of York > Biology (York)
Depositing User: Repository Officer
Date Deposited: 28 Jan 2005
Last Modified: 17 Oct 2013 14:39
Status: Published
Refereed: Yes
URI: http://eprints.whiterose.ac.uk/id/eprint/262

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