The fruiting quantity and nut and seed characters of different Alnus cremastogyne clones were studied in this paper. The results showed that the fruiting quantity was highly significantly different among different clo...The fruiting quantity and nut and seed characters of different Alnus cremastogyne clones were studied in this paper. The results showed that the fruiting quantity was highly significantly different among different clones and different years, however not different within a clone, which indicated that fruiting quantity was mainly controlled by genetic factors. There were significant or highly significant differences in nut length, width, 1 000-grain mass, number of full seed, seed potential and seed efficiency among different clones, which showed abundant genetic variation. However, there were no significant differences in nut length, width, 1 000-grain mass and seed potential within the same clone, which showed that the characters were mainly controlled by genetic factors too. Nevertheless, there were significant differences in number of full seed and seed efficiency within the same clones. It would be effective for seed orchard management based on the fruiting quantity and nut and seed characters of different clones.展开更多
The cone and seed characters of Pinus Massoniana were investigated in a clonal seed orchard for two successive years(1998 and 1999).The results showed that significant genetic variation existed among clones,while vari...The cone and seed characters of Pinus Massoniana were investigated in a clonal seed orchard for two successive years(1998 and 1999).The results showed that significant genetic variation existed among clones,while variation within clone had not come up to remarkable standard.Broad sense herit ability of cone and seed characters in P.massoniana were influenced by genetic factors,most of them were at over middle level.There was a extremely significant difference in the correlation coefficients among the characters of cone and seeds,and the correlation coefficients of the same character in different years were at the extremely significant level,which indicated that the clones were quite stable from year to year in cone and seed quality and size.At last,the comprehensive evaluation was estimated in 140 clones by main index of reproductive capacity.The genetic gain of cone yield of a single tree,the seed numble of a single cone,and full seed percentage,and reselection of clones were discussed under different selection intensities.展开更多
文摘The fruiting quantity and nut and seed characters of different Alnus cremastogyne clones were studied in this paper. The results showed that the fruiting quantity was highly significantly different among different clones and different years, however not different within a clone, which indicated that fruiting quantity was mainly controlled by genetic factors. There were significant or highly significant differences in nut length, width, 1 000-grain mass, number of full seed, seed potential and seed efficiency among different clones, which showed abundant genetic variation. However, there were no significant differences in nut length, width, 1 000-grain mass and seed potential within the same clone, which showed that the characters were mainly controlled by genetic factors too. Nevertheless, there were significant differences in number of full seed and seed efficiency within the same clones. It would be effective for seed orchard management based on the fruiting quantity and nut and seed characters of different clones.
文摘The cone and seed characters of Pinus Massoniana were investigated in a clonal seed orchard for two successive years(1998 and 1999).The results showed that significant genetic variation existed among clones,while variation within clone had not come up to remarkable standard.Broad sense herit ability of cone and seed characters in P.massoniana were influenced by genetic factors,most of them were at over middle level.There was a extremely significant difference in the correlation coefficients among the characters of cone and seeds,and the correlation coefficients of the same character in different years were at the extremely significant level,which indicated that the clones were quite stable from year to year in cone and seed quality and size.At last,the comprehensive evaluation was estimated in 140 clones by main index of reproductive capacity.The genetic gain of cone yield of a single tree,the seed numble of a single cone,and full seed percentage,and reselection of clones were discussed under different selection intensities.
