Effective number and seed production in a clonal seed orchard of Pinus koraiensis
2004
Kyu-Suk Kang | Wan-Yong Choi | Sang-Urk Han | Chang-Soo Kim
Theory on the tradeoff between effective number and seed production was applied to a clonal seed orchard of Pinus koraiensis in Korea. By controlling maternal fertility, a balancing between equalizing maternal contribution and obtaining an acceptable amount of seed was achieved. Constrains on seed production was made on the maternal proportion as both lower and upper bounds. For maternal gametes in the seed orchard of P. koraiensis CI 80 clones), the effective number of parent (Np) was estimated to 132.1 clones (73% of census number, N) based on the average observation of 9 years. For the level of clone, Np was estimated to 66.8 clones (37 % of census number) if all seeds were collected and used. Higher effective number of parents could be obtained by balancing the number of seeds collected per clone, but such increase of the effective number would resuIt in substantial loss of seed production. If it was decided to truncate the seed production from 90% of census number and to collect the equal amount of seed from the best 10% clones, this increased the effective number from 132.1 to 143.7 and the loss of seed production would be 5.5%.
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