Thesis (MTech (Horticulture))--Cape Peninsula University of Technology, 2007. / Gethyllis multifo/ia and Gethyl/is villose (Family: AMARYLLIDACEAE) are indigenous geophytes,
growing naturally in the Worcester area, Western Cape. G. muliiiolie falls in the Vulnerable
category of the Red Data List of Southern African Plants while G. vil/osa is not threatened at all.
Both these species are winter growers and start their growing phase between March and April.
These bulbs start their dormant phase between September and October when their leaves start
to die down. Flowers of both species are short-lived and borne towards the end of November
and early December when no leaves are present. The leaves and berries are simultaneously
pushed above ground at the onset of the new growing phase. The fruit of some Gethyl/is
species is sweet, juicy, pleasantly aromatic and good to eat and has medicinal properties for the
cure of various ailments. The genus is difficult to propagate asexually and very little is known
about its propagation and cultivation. The fragrance and medicinal value of the fruit of
G. multifolia necessitates future research in the commercial production of this species.
A habitat observation study of the two species was conducted to assess the vulnerable status of
G. multitolie. Asexual propagation experiments were conducted to find ways of reproducing
these two species successfully. A hydro culture study was also conducted to ascertain whether
this method of cultivation could be incorporated in the general cultivation of the two species.
Finally an in vitro propagation study was conducted to look at faster methods of reproducing
these two species. This is of extreme importance in the conservation of the vulnerable
G. multitolie.
Leaf, root and basal plate cuttings were unsuccessful with no rooting in both species.
G. mulfifo/ia bulbs were propagated successfully using twin scaling, bulb cuttings, scooping and
scoring propagation techniques with between 80% and 100% rooting success. G. vil/osa was
unsuccessful using the above propagation techniques with a 0 - 40% rooting rate.
Although Gefhyl/is species in general are sensitive to over-watering, the hydro culture
experiment with the sub-irrigation system and leca pellet medium proved to be an effective
method of cultivating both species throughout the growing phase. G. mulfifo/ia proved to be
unsuccessful during the initial in vitro propagation experiments with no surviving explants during
the initiation phase. Results improved with an increased number of trials. It is possible to grow both species by means of in vitro propagation, but more emphasis in future research, should be
placed on the multiplication aspect of G. mu/tifo/ia, since not many new buibiets were produced.
It was observed through this study that grazing domestic livestock, urban expansion (this
includes agricultural extension) and in some cases the lack of interest shown in our indigenous
plant species, are some of the main factors influencing the decline in numbers of this species.
It is also recommended that more emphasis be placed on the conservation of South Africa's
indigenous flora and that the vulnerable status of G. multifolia according to The Red Data List of
Southern African Plants, be changed to the "Endangered category" as the factors causing its
decline continue to increase.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:cput/oai:localhost:20.500.11838/2614 |
| Date | January 2007 |
| Creators | Daniëls, Christiaan Winston |
| Contributors | Joubert, C |
| Publisher | Cape Peninsula University of Technology |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Rights | http://creativecommons.org/licenses/by-nc-sa/3.0/za/ |
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