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Plant Physiol, November 1999, Vol. 121, pp. 839-847
AXR1 Acts after Lateral Bud Formation
to Inhibit Lateral Bud Growth in Arabidopsis1
Petra
Stirnberg,
Steven P.
Chatfield, and
H.M. Ottoline
Leyser*
Department of Biology, University of York, P.O. Box 373, York YO10
5YW, United Kingdom
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.
1
This work was supported by a grant from the
Biotechnology and Biological Sciences Research Council of the United Kingdom.
*
Corresponding author; e-mail hmol1{at}york.ac.uk; fax
44-1904-434312.
© 1999 American Society of Plant Physiologists
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