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PLANT PHYSIOLOGY , Vol 107, Issue 1 233-243, Copyright © 1995 by American Society of Plant Biologists
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DEVELOPMENT AND GROWTH REGULATION |
STUNTED PLANT 1, A Gene Required for Expansion in Rapidly Elongating but Not in Dividing Cells and Mediating Root Growth Responses to Applied Cytokinin
T. I. Baskin, A. Cork, R. E. Williamson and J. R. Gorst
Plant Cell Biology Group, Research School of Biological Sciences, Australian National University Canberra, Australian Capital Territory 2601, Australia (T.I.B., A.C., R.E.W.)
To understand the control of spatial patterns of expansion, we have studied
root growth in wild type and in the stunted plant 1 mutant, stp1, of
Arabidopsis thaliana. We measured profiles of cell length and calculated
the distribution of elongation rate. Slow growth of stp1 results both from
a failure of dividing cell number to increase and from low elongation rates
in the zone of rapid expansion. However, elongation of dividing cells was
not greatly affected, and stp1 and wild-type callus grew at identical
rates. Thus, rapid cellular expansion differs in mechanism from expansion
in dividing cells and is facilitated by the STP1 gene. Additionally, there
was no difference between stp1 and wild-type roots for elongation in
response to abscisic acid, auxin, ethylene, or gibberellic acid or for
radial expansion in response to ethylene; however, stp1 responded to
cytokinin much less than wild type. In contrast, both genotypes responded
comparably to hormones when explants were cultured; in particular, there
was no difference between genotypes in shoot regeneration in response to
cytokinin. Thus, effects on root expansion mediated by cytokinin, but not
effects mediated by other hormones or effects on other cytokinin-mediated
responses, require the STP1 locus.
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