Fertility variation and its effect on the relatedness of seeds in Pinus densiflora, Pinus thunbergii and Pinus koraiensis clonal seed orchards
1998
Kang, K.S. | Lindgren, D.
The numbers of female and male strobili were counted in clonal seed orchards with 99 clones of Pinus densiflora. and 60 clones of P. thunbergii and in an archive consisting of 180 clones of P. koraiensis, respectively. The observation data showed a great variation in both female and male strobili among clones in the three populations. It was possible to express the expected contribution of genotypes to seed crop as an inverse of cumulative function of type, x = F(x)(1/a), where x is the expected contribution of seed orchard genotypes and F(x) is the ranked relative contribution of flowering production. Parameter a is a parameter which describes flowering variation. Status number and variance effective population size could be related to the square sum of contribution. The status numbers were calculated to be 69.2 (70% of the initial census number), 54.6 (91%) and 38.8 (22%) in the expected crops of clonal seed orchards of P. densiflora, P. thunbergii and P. Koraiensis, respectively. The variance effective population sizes connecting these orchards with their expected crops were estimated to be 230.3, 610.3 and 49.4, respectively. Despite the large differences in status numbers and variance effective population sizes, the group coancestry remained at a low value in all expected seed orchard crops. Relative gene diversity compared to the reference population from which plus trees were selected was quite high in all populations.
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