Harpagoside

 Home Up

Presentation on Harpagoside

 

Prepared by:

 

Prof. Dieter von Willert

Institute for Plant Ecology

University of Münster

Hindenburgplatz 55

D-48143 Münster

Germany

E-mail: Willert@uni-muenster.de

Webpage: www.uni-muenster.de/Biologie/

pflanzenoekologie/

 

Dr. Ernst Schneider

Salus-Haus

Bahnhofstrasse 24

D-83052 Bruckmühl (Obb.)

Tel.: ++49 8062/90 1-0

Fax:: ++49 8062/90 1-310

E-mail: ejgs.aib@t-online.de

 

 

 

Figure 1: This Figure shows the Hapagoside content in 16 secondary tubers of Harpago­phytum procumbens of plant S4 which was harvested in September 1998. The H-content varies from tuber to tuber and differs from tuber D,I and P by a factor of three.

 

 

 

Figure 2: This Figure shows the Hapagoside content in 12 Harpagophytum procumbens plants which were harvested in December 1998. The H-content varies considerably from plant to plant and differs from plant D4 to plant D5 by a factor of about 2. For each plant the mean and the standard deviation of all tubers of that particular is given.

 

 

Figure 3: This Figure shows the Hapagoside content in the secondary tubers of Harpagophytum procumbens plants which were harvested at five different times within a year. The variation of the  H-content at the different sampling dates did not differ significantly from each other (except for 5.98 and 12.98). For each sampling date the  mean and the standard deviation of all tubers of all plants harvested is given.

 

 

 

Figure 4: This Figure shows the Hapagoside content in the secondary tubers of Harpagophytum procumbens plants which were harvested at the same time from a wild population and from cultivated plants of a known age. Variation of the H-content between the different secondary tubers is smaller for tubers of equal age.

 

 

 

 

An important question is whether or not the H-content is under genetic control. A survey along the geographical latitude in Namibia showed that the H-content in plants sampled at different locations from south to north varies between about 1 and 3%. This has been interpreted in terms of high and low performing plants indicating chemotypes. The H-content found in the different tubers of one plant at Avontuur sampled in September 1998 (S4) shows the same magnitude of variation as the plants in Namibia. Additionally, The variation of the H-content in the different tubers of all 12 plants harvested in December 1998 does not differ from the previously shown scatter. These findings do not favour the existence of chemotypes.  

 

Send mail to avontuur@harpago.co.za
Last modified: Januarie 28, 2003