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Journal of Experimental Botany, Vol. 52, No. 355, pp. 319-327, February 2001
© 2001 Oxford University Press

Original Papers

Xylem hydraulic conductivity related to conduit dimensions along chrysanthemum stems

J. Nijsse1,3, G.W.A.M. van der Heijden2, W. van Ieperen1, C.J. Keijzer1 and U. van Meeteren1

1 Department of Plant Sciences, Wageningen University, Wageningen, The Netherlands
2 Plant Research International, Wageningen, The Netherlands

The stem xylem conduit dimensions and hydraulic conductivity of chrysanthemum plants (Dendranthemaxgrandiflorum Tzvelev cv. Cassa) were analysed and quantified. Simple exponential relations describe conduit length distribution, height dependency of conduit length distribution, and height dependency of stem hydraulic conductivity. These mathematical descriptions can be used to model the xylem water transport system. Within a chrysanthemum stem of 1.0 m, the conduit half-length (the length within which 50% of the conduits have their end) was 0.029 m at soil surface and decreased by half at a height of 0.6 m. With each 0.34 m increase in height up the stem, the hydraulic conductivity decreased by 50%. The resistance calculated from conduit lumen characteristics was 70% of the measured resistance. The remaining unexplained part of the hydraulic resistance is at least partly caused by inter-conduit connections.

Key words: Xylem conduit anatomy, hydraulic conductance, digital image analysis, Dendranthemaxgrandiflorum Tzvelev, vessel length distribution.


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