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 0032-0889Full text available as:
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.
|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|