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Plant Physiol, December 1999, Vol. 121, pp. 1179-1190
Auxin Is Required for Leaf Vein Pattern in
Arabidopsis1
Leslie E.
Sieburth*
Department of Biology, McGill University, 1205 Dr. Penfield Avenue,
Montreal, Quebec, Canada H3A 1B1 and Department of Biology University
of Utah, Salt Lake City, Utah 84112
To investigate possible roles of
polar auxin transport in vein patterning, cotyledon and leaf vein
patterns were compared for plants grown in medium containing polar
auxin transport inhibitors (N-1-naphthylphthalamic acid,
9-hydroxyfluorene-9-carboxylic acid, and 2,3,5-triiodobenzoic
acid) and in medium containing a less well-characterized inhibitor of
auxin-mediated processes,
2-(p-chlorophynoxy)-2-methylpropionic acid. Cotyledon
vein pattern was not affected by any inhibitor treatments, although
vein morphology was altered. In contrast, leaf vein pattern was
affected by inhibitor treatments. Growth in polar auxin transport
inhibitors resulted in leaves that lacked vascular continuity through
the petiole and had broad, loosely organized midveins, an increased
number of secondary veins, and a dense band of misshapen tracheary
elements adjacent to the leaf margin. Analysis of leaf vein pattern
developmental time courses suggested that the primary vein did not
develop in polar auxin transport inhibitor-grown plants, and that the
broad midvein observed in these seedlings resulted from the coalescence
of proximal regions of secondary veins. Possible models for leaf vein
patterning that could account for these observations are discussed.
1
This work was supported by the National Science
and Engineering Research Council of Canada (NSERC).
*
E-mail sieburth{at}biology.utah.edu; fax 801-581-4668.
© 1999 American Society of Plant Physiologists
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