A theory on the balance between gene diversity and level of nut collection was developed and applied to Danish hazelnut (Corylus avellana L.) populations. By controlling female fertility based on the power function F(x)=xa, a trade-off between equalizing maternal contribution and obtaining an acceptable amount of nuts was achieved, and gene diversity during the initial phase of mobilizing the natural gene pool could be managed. Constraints on nut production could be made on maternal proportion as both lower and upper bounds. For a case involving the collection of hazelnuts from 264 individuals, the status number (Ns) was estimated to be 149 based on female contribution if all nuts were collected and used. Higher status numbers could be obtained by balancing the number of nuts collected per tree, but such an increase in the status number would result in a substantial loss of nut production. It was decided to truncate the progeny size at 50 nuts, which required restriction of the nut contribution equally from the 14% most fertile individuals to a maximum contribution of 0.74%. This increased the Ns from 149 to 201, while 85% of all nuts were included.
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Document Type: Research Article
Tree Breeding Division Forest Genetic Resources Department, Korea Forest Research Institute 44-3 Omokchun, Kwonsun, Suwon 441-350 Kyonggi
The Royal Veterinary and Agricultural University Swedish University of Agricultural Sciences Arboretum DK-2970 Hoersholm
Department of Forest Genetics and Plant Physiology Swedish University of Agricultural Sciences SE-901 83 Umeå
Publication date: 01 January 2003
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