New Zealand Journal of Crop and Horticultural Science abstracts
Evaluation of variability in single plants of Boronia megastigma
using plant and chemical criteria
P. E. SMALE1
N. G. PORTER2
D. N. BURROWS1
M. N. NELSON1
J. P. LAMMERINK2
1New Zealand Institute for Crop & Food
Research Limited
Riwaka Research Centre
RD 3, Motueka, New Zealand
2New Zealand Institute for Crop & Food
Research Limited
Private Bag 4704
Lincoln
Christchurch, New Zealand
Abstract A seedling population of
Boronia megastigma
(Nees) plants was established to explore the extent and degree of variation in
plant and chemical characteristics and to select plants of superior performance
in the production of aromatic concretes for commercial use. Obvious variations
between selected individual plants were found in plant habit, growth vigour,
flower yield, ease of flower removal for harvesting, concrete yield,
[[beta]]-Ionone and monoterpene content, and the proportion of "volatile"
components in the concrete. Selection of elite plants on the basis of so many
different criteria is difficult. Quality indices were calculated by
incorporating the criteria for each plant into a single value that could be
used to rank the plants on plant, chemical, or combined criteria. Ranking using
plant and chemical indices gave very different results. Ranking using a quality
index that incorporates all criteria offers the opportunity to apply differing
weights to individual characteristics. Examples of weighting different criteria
are given and the use of weighting is discussed.
Keywords Boronia megastigma (Nees); selection;
concrete; yield; composition; flowers; [[beta]]-Ionone
New Zealand Journal of Crop and Horticultural Science, 1995, Vol. 23:
307-313
0114-0671/95/2303-0307 $2.50/0 (c) The Royal Society of New Zealand
1995
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