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Plant Physiol, December 2000, Vol. 124, pp. 1706-1717
Characterization of the Response of the Arabidopsis Response
Regulator Gene Family to Cytokinin1
Ingrid B.
D'Agostino,2
Jean
Deruère, and
Joseph J.
Kieber*
University of North Carolina, Biology Department, Chapel Hill,
North Carolina 27599-3280 (J.D., J.J.K.); and Department of Biological
Sciences, Laboratory for Molecular Biology, University of Illinois,
Chicago, Illinois 60607 (I.B.D., J.J.K.)
We examined the expression of a family of Arabidopsis response
regulators (ARR) and found that the steady-state levels of RNA for most
are elevated very rapidly by cytokinin. Using nuclear run-on assays we
demonstrated that this increase in ARR transcript levels in response to
cytokinin is due, at least in part, to increased transcription. The
start site of transcription for the ARR5 gene was
identified using primer extension analysis. A DNA fragment comprised of
1.6 kb upstream of the ARR5 transcript start site conferred cytokinin-inducible gene expression when fused to a  -glucuronidase reporter, confirming that the transcription rate of
ARR5 is elevated by cytokinin. This reporter construct
was also used to examine the spatial pattern of ARR5
expression. The highest levels of expression were observed in the root
and shoot apical meristems, at the junction of the pedicle and the
silique, and in the central portion of mature roots. The expression of ARR5 in the apical meristems was confirmed by whole
mount in situ analysis of seedlings and is consistent with a role for
cytokinin in regulating cell division in vivo.
1
This work was supported by the National Science
Foundation (grant no. MCB-9996354 to J.J.K.).
2
Present Address: Department of Molecular Biology
and Genetics, Johns Hopkins University School of Medicine, Baltimore,
MD 21205.
*
Corresponding author; jkieber{at}unc.edu; fax 919-962-1625.
© 2000 American Society of Plant Physiologists
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