Abstract
The minimum-inbreeding (MI) seed orchard layout, formulated originally as a global quadratic assignment problem, was expanded into realistic problem sizes that are often encountered in operational forestry, where two modifications were tested: (1) the merging algorithm of independent MI’s solutions (i.e., smaller blocks) and (2) the extended global (genetic-tabu) algorithm. Extending the global heuristic algorithm of the quadratic assignment problem seems to be the most efficient strategy. The reported minimum-inbreeding distance of the extended MI scheme was the lowest in comparison to the completely randomized and the randomized, replicated, staggered clonal-row (R2SCR) seed orchard design schemes. These conclusions also hold for more complex scenarios when added relatedness among orchard’s parents or unequal deployment was considered. This improved MI scheme is suitable to large and complex advanced-generation seed orchards, where many practical constraints have to be jointly considered.
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Acknowledgments
Support from the National Agency for Agriculture Research (NAZV; grant QJ1320013; M. Lstibůrek), the Ministry of Education, Youth and Sports (Kontakt II; grant LH13021; M. Lstibůrek), the Internal Grant Agency of the Czech University of Life Sciences (CIGA; grant 20144301; J. Korecký), and the Natural Sciences and Engineering Research Council of Canada (Discovery and IRC Grants) and the Johnson’s Family Forest Biotechnology Endowment to Y. A. El-Kassaby are highly appreciated.
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In our study, we were developing mathematical model to optimize spatial allocation of trees in seed orchards. We did not use any real-world data of any species, nor any sequencing data. As far as the actual mathematical model, it is thoroughly described in the text. All output data have been prepared and published in figures that are included in the manuscript (the resulting spatial allocation).
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Communicated by J. Beaulieu
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Lstibůrek, M., Stejskal, J., Misevicius, A. et al. Expansion of the minimum-inbreeding seed orchard design to operational scale. Tree Genetics & Genomes 11, 12 (2015). https://doi.org/10.1007/s11295-015-0842-5
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DOI: https://doi.org/10.1007/s11295-015-0842-5