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A preliminary survey of selected species of endemic plants to determine commercial cropping potential for essential oils


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Dragar, V A(Valerie Annette) 1984 , 'A preliminary survey of selected species of endemic plants to determine commercial cropping potential for essential oils', Coursework Master thesis, University of Tasmania.

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This work was embarked upon as a preliminary survey of the Tasmanian
endemic essential-oil-bearing plants, with a view to locating species
which may be suitable for commercial production of oil.
Initially, twenty plant species were selected as having been
observed to contain an essential oil. The species were : Bedfordia
salicina, Beyeria viscosa, Callitris tasmanica, Cassinia aculeata, Drimys
lanceolata (also known as Tasmannia lanceolata), Eriostemon virgatus,
Kunzea ambigua, Leptospermum glaucescens, Leptospermum lanigerum,
Leptospermum scoparium, Melaleuca squamea, Melaleuca squarrosa, Olearia
argophylla, Olearia phlogopappa, Phebalium squameum, Prostanthera
lasianthos, Senecia linearifolius and Zieria arborescens. Material from
these species was taken for steam distillation and solvent extraction,
and the oil samples, thus obtained, were analysed by GC-MS. In addition,
data on yields of oil were compiled, in order that comparisons between
species could be made.
The number of species under investigation was reduced to ten, by
excluding those that did not possess a persistent or powerfully pleasant
odour. The other major criterion used in determining which species may
be of commercial value was oil yield, which was not to be less than 0.1%.
The species that were retained were as follows: B. viscosa, C. tasmanica,
D. lanceolata, E. virgatus, E. amygdalina, K. ambigua, L. glaucescens, L.
lanigerum, 0. phlogopappa and P. squameum.
Comparisons between the estimated yield of these species, on a per
hectare basis, with that of commercial essential oil crops, showed that
they have the potential to produce similar quantities of oil.
Scanning electron microscope studies of the oil glands of the ten
selected species were undertaken. These showed definite similarities in
structure, both among themselves and with glands described in the
Small-scale propagation trials were run with the species listed
above. Many were found to grow readily form cuttings, whilst others were
easily raised from seed, and all of the ten species were propagated by one or other of these means. However, tissue culture techniques would
vastly improve the efficiency of any large scale propagation project.
The GC-MS results showed the preesence of many commercially
important compounds, as well as one which had not been cited previously
in the literature, namely epi-Y-eudesmol in Olearia spp. Compounds which
were identified by this method were quantified by determining the area
under the relevant peak. In addition, the oils from these species were
examined using a gas chromatograph which had been equipped with a
splitter, so that the various components could be described as they were
vented from the column.

Item Type: Thesis - Coursework Master
Authors/Creators:Dragar, V A(Valerie Annette)
Keywords: Essences and essential oils, Botany, Economic
Copyright Holders: The Author
Copyright Information:

Copyright 1984 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (M. Agr. Sc.)--University of Tasmania, 1985. Bibliography: leaves 152-164

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