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
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.
Metadata
Item Type: | Article |
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Authors/Creators: |
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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 |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Biology (York) |
Depositing User: | Repository Officer |
Date Deposited: | 28 Jan 2005 |
Last Modified: | 16 Oct 2024 12:01 |
Status: | Published |
Refereed: | Yes |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:262 |