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Bornman, C.H., Botha, C.E.J. and Nash, L.J. 1973. Welwitschia mirabilis: observations on movement of water and assimilates under föhn and fog conditions. Madoqua, 2(2): 25-31


Description:

Welwitschia mirabilis: observations on movement of water and assimilates under föhn and fog conditions.

Summary / Notes:

Evidence that Welwitschia is able to absorb and translocate the water which condenses on its leaves under foggy conditions has been obtained by the application and subsequent localisation of tritiated water. Scanning electron microscopy of the leaves suggests that the path of water uptake may be via the stomata. Rates of uptake under foggy and fhn wind conditions are compared. Preliminary investigation of the movement of photosynthetic assimilates indicates that these are rapidly translocated in the direction of the meristematic regions. Keywords: Abaxial Ieaf surface, activcly-meristematic stem regions, Advection fogs, Artifically-created microclimate, Atmospheric humidity, Bizarre habit, CO2 assimilation, Distal diffusion rates, Ethanol, Internal anatomy, Liquid-scintillation, Meristematic zone, Proximal, Transpiration by leaves and Water translocated.

Year: 1973

Type: Journal Article

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