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Stunted-Plant-1, a gene required for expansion in rapidly elongating but not in dividing cells and mediating root growth responses to applied cytokinin

journal contribution
posted on 2023-05-16, 07:38 authored by Baskin, TI, Cork, A, Williamson, RE, Gorst, JR
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.

History

Publication title

Plant Physiology

Volume

107

Pagination

233-243

ISSN

0032-0889

Department/School

School of Natural Sciences

Publisher

Amer Soc Plant Biologists

Place of publication

15501 Monona Drive, Rockville, USA, Md, 20855

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the environmental sciences

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