|
|||||
|
|
Genetic diversity of Pinus densiflora pollen flowing over fragmented populations during a mating season |
|
| Authors: | Hajime Ozawa Atsushi Watanabe Kentaro Uchiyama Yoko Saito Yuji Ide |
| Institution: | 1. Fukushima Prefectural Forestry Research Centre, 1 Nishijimasaka, Narita, Asaka-machi, Koriyama, 963-0112, Japan 2. Forest Tree Breeding Center, Forestry and Forest Products Research Institute, Ishi 3809-1, Juo, Hitachi, Ibaraki, 319-1301, Japan 3. Tree Genetics Laboratory, Department of Forest Genetics, Forestry and Forest Products Research Institute, Tsukuba, Ibaraki, 305-8687, Japan 4. Laboratory of Forest Ecosystem Studies, Department of Ecosystem Studies, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo, 113-8657, Japan |
| Abstract: | We attempted to evaluate the genetic diversity of long-distance transported pollen flowing over fragmented Pinus densiflora populations during a mating season. A P.?densiflora clonal seed orchard, which was located in a rural area where many fragmented populations exist, was selected for pollen capture. Immigrant pollen captured by three clones having different flowering times was regarded as the pollen flowing over fragmented populations during a mating season. The genetic diversity (H e) values of the immigrant pollen captured by the three clones were high (H e?>?0.894). The correlation of paternity (r p) values of the seeds having immigrant parent generated from the three clones were calculated to be negative. From these parameters, the pollen cloud is considered to have maintained high genetic diversity during the mating season. The genetic composition of the pollen cloud showed slight variation. The pollen captured by different trees (i.e., clonal ramets of the three clones) was significantly different based on analysis of molecular variance. Especially, the pollen pools captured by trees planted in the western side of the orchard were significantly different from the gene pool of the surrounding populations. Factors affecting this differentiation could be that the donors of the pollen transported to the orchard vary with time, as well as nonuniform dispersal of the pollen. From these results, the pollen flowing over fragmented P.?densiflora populations is considered to have high genetic diversity, compensating to some extent for fragmentation. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |