Welwitschia mirabilis : Observations on cuticular efficiency / Chris H. Bornman

By:

Bornman, Chris H

Material type: Text

TextLanguage: English Series: Madoqua, Series II, Vol. 3, Nos. 69-73, 1974; p. 17 - 25Publication details: Windhoek : Nature Conservation and Tourism Branch of the South West Africa Administration, 1974, : John Meinert (Pty) Ltd.Description: 9 pages : fig., tables; 28 cmSubject(s):

DDC classification:

PER 154 Madoqua

Summary: Experiments were carried out to determine the effects of removal of the cuticle on loss of water from the leaves of Welwitschia mirabilis, a long-lived gymnosperm-like vascular plant endemic to the Namib Desert. For purposes of comparison the same experiments were carried out on a succulent, Crassula multicava, a subtropical shade tree, Trichilia emetica, and an evergreen ornamental shrub, Ligustrum japonicum. The results showed that in Welwitschia and Crassula internal leaf characteristics were probably more important than the cuticle in reducing evaporation, while in Trichilia and Ligustrum the cuticle was chiefly responsible for the reduction of water loss. It is concluded that, for a desert species, Welwitschia is remarkably non-xeromorphic

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Abstract in Afrikaans References

Experiments were carried out to determine the effects of removal of the cuticle on loss of water from the leaves of Welwitschia mirabilis, a long-lived gymnosperm-like vascular plant endemic to the Namib Desert. For purposes of comparison the same experiments were carried out on a succulent, Crassula multicava, a subtropical shade tree, Trichilia emetica, and an evergreen ornamental shrub, Ligustrum japonicum. The results showed that in Welwitschia and Crassula internal leaf characteristics were probably more important than the cuticle in reducing evaporation, while in Trichilia and Ligustrum the cuticle was chiefly responsible for the reduction of water loss. It is concluded that, for a desert species, Welwitschia is remarkably non-xeromorphic

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