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Plant Cell, Vol. 11, 2123-2138, November 1999, Copyright © 1999, American Society of Plant Physiologists
Genetic Regulation of Vascular Tissue Patterning in Arabidopsis
Francine M. Carlanda,
Barbara L. Bergb,
Jonathan N. FitzGeraldb,
Suchaya Jinamornphongsb,
Timothy Nelsona, and
Brian Keithc
a Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut 06520-8104
b Department of Molecular Genetics and Cell Biology, University of Chicago, 1103 East 57th Street, Chicago, Illinois 60637
c Department of Medicine, University of Chicago, 5841 Maryland Avenue, Chicago, Illinois 60637
Correspondence to:
Brian Keith, bkeith{at}mail.med.upenn.edu (E-mail), 215-746-5511 (fax)
Plants transport water and nutrients through a complex vascular network comprised of interconnected, specialized cell types organized in discrete bundles. To identify genetic determinants of vascular tissue patterning, we conducted a screen for mutants with altered vascular bundle organization in Arabidopsis cotyledons. Mutations in two genes, CVP1 and CVP2 (for cotyledon vascular pattern), specifically disrupt the normal pattern of vascular bundles in cotyledons, mature leaves, and inflorescence stems. The spatial distribution of the procambium, the precursor to mature vascular tissue, is altered in cvp1 and cvp2 embryos, suggesting that CVP1 and CVP2 act at a very early step in vascular patterning. Similarly, in developing stems of cvp1 and leaves of cvp2, the pattern of vascular differentiation is defective, but the maturation of individual vascular cells appears to be normal. There are no discernible alterations in cell morphology in cvp2 mutants. In contrast, cvp1 mutants are defective in directional orientation of the provascular strand, resulting in a failure to establish uniformly aligned vascular cells, and they also show a reduction in vascular cell elongation. Neither cvp1 nor cvp2 mutants displayed altered auxin perception, biosynthesis, or transport, suggesting that auxin metabolism is not generally affected in these mutants.
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