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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

Citation

Baskin, TI and Cork, A and Williamson, RE and Gorst, JR, Stunted-Plant-1, a gene required for expansion in rapidly elongating but not in dividing cells and mediating root growth responses to applied cytokinin, Plant Physiology, 107, (1) pp. 233-243. ISSN 0032-0889 (1995) [Refereed Article]

DOI: doi:10.1104/pp.107.1.233

Abstract

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.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant biology not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the environmental sciences
UTAS Author:Gorst, JR (Dr Gorst)
ID Code:3496
Year Published:1995
Web of Science® Times Cited:71
Deposited By:Plant Science
Deposited On:1995-08-01
Last Modified:2011-08-22
Downloads:0

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