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

被引:123
作者
Stirnberg, P [1 ]
Chatfield, SP [1 ]
Leyser, HMO [1 ]
机构
[1] Univ York, Dept Biol, York YO10 5YW, N Yorkshire, England
关键词
D O I
10.1104/pp.121.3.839
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
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.
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页码:839 / 847
页数:9
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