Black locust （Robinia pseudoacacia L.） is one of the most important stand-forming tree species in Hungary and its impor- tance is increasing in many countries. The main aim of the discussed new selection programme i...Black locust （Robinia pseudoacacia L.） is one of the most important stand-forming tree species in Hungary and its impor- tance is increasing in many countries. The main aim of the discussed new selection programme is to identify black locust clones with good performance and good form for setting up clonal seed orchards. As a result of selection programme 16 new black locust clones have been improved. In spring 2002 a black locust seed orchard was established with the newly selected clones. About 40% of the plants can be considered to belong to the height growth rate class 1 and 2. Hungary was the first country where micropropagated black locust planting material was used for seed orchard establishment.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Black locust （Robinia pseudoacacia L.） is one of the most important stand-forming tree species in Hungary and its impor- tance is increasing in many countries. The main aim of the discussed new selection programme is to identify black locust clones with good performance and good form for setting up clonal seed orchards. As a result of selection programme 16 new black locust clones have been improved. In spring 2002 a black locust seed orchard was established with the newly selected clones. About 40% of the plants can be considered to belong to the height growth rate class 1 and 2. Hungary was the first country where micropropagated black locust planting material was used for seed orchard establishment.
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.
