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Presentation on Harpagoside
Prepared by:
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.
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