Optimization of combined genetic gain and diversity for collection and deployment of seed orchard crops |
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Authors: | T Funda M Lstibůrek P Lachout J Klápště Y A El-Kassaby |
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Institution: | 1. Department of Forest Sciences, Faculty of Forestry, University of British Columbia, 2424 Main Mall, V6T 1Z4, Vancouver, BC, Canada 2. Department of Dendrology and Forest Tree Breeding, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Kamycká 129, Prague 6, 165 21, Czech Republic 3. Department of Probability and Statistics, Faculty of Mathematics and Physics, Charles University in Prague, Sokolovská 83, Prague 8, 186 75, Czech Republic 4. Institute of Information Theory and Automation, Czech Academy of Sciences, Pod vodárenskou vě?í 4, Praha 8, 182 08, Prague, Czech Republic
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Abstract: | Genetic gain and diversity of seed orchards’ crops are determined by the number of parents, their breeding values and relatedness,
within-orchard pollination efficiency, and level of pollen contamination. These parameters can be manipulated at establishment
by varying clonal representation (e.g., linear deployment), during orchard development by genetic thinning, or by selective
harvesting. Since clonal fecundities are known to vary both within and among years, then each seed crop has a unique genetic
composition and, therefore, crops should be treated on a yearly basis. Here we present an optimization protocol that maximizes
crop’s genetic gain at any desired genetic diversity through the selection of a subset of the crop that meets both parameters.
The genetic gain is maximized within the biological limit set by each clone’s seed-cone production and effective population
size is used as a proxy to genetic diversity whereby any relationship among clones is considered. The optimization was illustrated
using 3 years’ reproductive output data from a first-generation western larch seed orchard and was tested under various scenarios
including actual male and female reproductive output and male reproductive output assumed to be either equal to that of female
or a function of clonal representation. Furthermore, various levels of co-ancestry were assigned to the orchard’s clones in
supplementary simulations. Following the optimization, all solutions were effective in creating custom seedlots with different
gain and diversity levels and provided the means to estimate the genetic properties of composite seedlots encompassing the
remaining “unused” seed from a number of years. |
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