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Development, Vol 126, Issue 13 2979-2991, Copyright © 1999 by Company of Biologists

JOURNAL ARTICLES

Responses of plant vascular systems to auxin transport inhibition

J Mattsson, ZR Sung and T Berleth
Department of Plant and Microbial Biology, University of California, Berkeley CA 94720, USA. berleth@botany.utoronto.ca

To assess the role of auxin flows in plant vascular patterning, the development of vascular systems under conditions of inhibited auxin transport was analyzed. In Arabidopsis, nearly identical responses evoked by three auxin transport inhibitor substances revealed an enormous plasticity of the vascular pattern and suggest an involvement of auxin flows in determining the sites of vascular differentiation and in promoting vascular tissue continuity. Organs formed under conditions of reduced auxin transport contained increased numbers of vascular strands and cells within those strands were improperly aligned. In leaves, vascular tissues became progressively confined towards the leaf margin as the concentration of auxin transport inhibitor was increased, suggesting that the leaf vascular system depends on inductive signals from the margin of the leaf. Staged application of auxin transport inhibitor demonstrated that primary, secondary and tertiary veins became unresponsive to further modulations of auxin transport at successive stages of early leaf development. Correlation of these stages to anatomical features in early leaf primordia indicated that the pattern of primary and secondary strands becomes fixed at the onset of lamina expansion. Similar alterations in the leaf vascular responses of alyssum, snapdragon and tobacco plants suggest common functions of auxin flows in vascular patterning in dicots, while two types of vascular pattern alterations in Arabidopsis auxin transport mutants suggest that at least two distinct primary defects can result in impaired auxin flow. We discuss these observations with regard to the relative contributions of auxin transport, auxin sensitivity and the cellular organisation of the developing organ on the vascular pattern.
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L. E. Sieburth
Auxin Is Required for Leaf Vein Pattern in Arabidopsis
Plant Physiology, December 1, 1999; 121(4): 1179 - 1190.
[Abstract] [Full Text]


© The Company of Biologists Ltd 1999