Planta

, Volume 209, Issue 1, pp 77–86

Desiccation and osmotic stress increase the abundance of mRNA of the tonoplast aquaporin BobTIP26-1 in cauliflower cells

  • François Barrieu
  • Danièle Marty-Mazars
  • Dominique Thomas
  • François Chaumont
  • Maryse Charbonnier
  • Francis Marty
Article

DOI: 10.1007/s004250050608

Cite this article as:
Barrieu, F., Marty-Mazars, D., Thomas, D. et al. Planta (1999) 209: 77. doi:10.1007/s004250050608

Abstract.

Changes in vacuolar structure and the expression at the RNA level of a tonoplast aquaporin (BobTIP26-1) were examined in cauliflower (Brassicaoleracea L. var. botrytis) under water-stress conditions. Gradual drying out of slices of cauliflower floret tissue caused its collapse, with a shrinkage in tissue and cell volumes and an apparent vesiculation of the central vacuole, whereas osmotic stress resulted in plasmolysis with a collapse of the cytoplasm and the central vacuole within. Osmotic stress caused a rapid and substantial increase in BobTIP26 mRNA in slices of floret tissue. Exposure of tissue slices to a regime of desiccation showed a slower but equally large rise in BobTIP26 mRNA followed by a rapid decline upon rehydration. In situ hybridization showed that BobTIP26-2 mRNA is expressed most highly in meristematic and expanding cells of the cauliflower florets and that desiccation strongly increased the expression in those cells and in differentiated cells near the xylem vessels. These data indicate that under water-deficit conditions, expression of the tonoplast aquaporin gene in cauliflower is subject to a precise regulation that can be correlated with important cytological changes in the cells.

Key words: AquaporinBrassica (cauliflower)Gene regulationTonoplastVacuoleWater stress

Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • François Barrieu
    • 1
  • Danièle Marty-Mazars
    • 1
  • Dominique Thomas
    • 1
  • François Chaumont
    • 2
  • Maryse Charbonnier
    • 1
  • Francis Marty
    • 1
  1. 1.Laboratoire de phyto Biologie Cellulaire, Université de Bourgogne, BP 47870, F-21078 Dijon Cedex, FranceFR
  2. 2.Department of Biology, University of California, San Diego, La Jolla, CA 92093-0116 USAUS