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Plant Physiol, December 1999, Vol. 121, pp. 1163-1168
Disruption of Auxin Transport Is Associated with Aberrant Leaf
Development in Maize1
Miltos
Tsiantis,
Matthew I.N.
Brown,
Gaia
Skibinski, and
Jane A.
Langdale*
Department of Plant Sciences, University of Oxford, South Parks
Road, Oxford, OX1 3RB United Kingdom
Despite recent progress, the
mechanisms governing shoot morphogenesis in higher plants are only
partially understood. Classical physiological studies have suggested
that gradients of the plant growth regulator auxin may play a role in
controlling tissue differentiation in shoots. More recent molecular
genetic studies have also identified knotted1 like
homeobox (knox) genes as important regulators of shoot
development. The maize (Zea mays L.) mutant rough
sheath2 (rs2) displays ectopic expression of at
least three knox genes and consequently conditions a
range of shoot and leaf phenotypes, including aberrant vascular
development, ligular displacements, and dwarfism (R. Schneeberger, M. Tsiantis, M. Freeling, J.A. Langdale [1998] Development 125:
2857-2865). In this report, we show that rs2 mutants
also display decreased polar auxin transport in the shoot. We also
demonstrate that germination of wild-type maize seedlings on agents
known to inhibit polar auxin transport mimics aspects of the
rs2 mutant phenotype. The phenotype elaborated in
inhibitor-treated plants is not correlated with ectopic KNOX protein accumulation.
1
This work was supported by grants from the
Biotechnology and Biological Sciences Research Council and the Gatsby
Charitable Foundation to J.A.L. M.T. is the recipient of a
University of Oxford Glasstone Postdoctoral Fellowship. M.I.N.B. and
G.S. were recipients of Nuffield Foundation Undergraduate Bursaries.
*
Corresponding author; e-mail jane.langdale{at}plants.ox.ac.uk; fax
44-1865-275147.
© 1999 American Society of Plant Physiologists
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