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
Heterosis refers to hybrids that exhibit greater vigor in biomass,yield,and adaptation compared with their parents.Nearly all annual crops exhibit heterosis to a certain extent[1].Heterosis is widely utilized in vario...Heterosis refers to hybrids that exhibit greater vigor in biomass,yield,and adaptation compared with their parents.Nearly all annual crops exhibit heterosis to a certain extent[1].Heterosis is widely utilized in various crops including rice,maize,vegetables,and certain perennials[2];however,it cannot be stably inherited in subsequent seasons because of segregation,and hybrid seed production requires complex techniques and substantial resource consumption during every season[3].Apomixis is an asexual mode of seed reproduction that is observed in over 400 plant species.It produces clonal seeds and offspring that are genetically identical to the maternal parent[4].This mechanism has been proposed to revolutionize crop breeding by enabling the rapid fixation and effective utilization of heterosis and elite heterozygous genotypes[5].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.
基金supported by the National Natural Science Foundation of China(32025028 and 32188102)the National Key Research and Development Program of China(2022YFF1003304)the Agricultural Science and Technology Innovation Program(CAAS-ASTIP-2021-CNRRI)。
文摘Heterosis refers to hybrids that exhibit greater vigor in biomass,yield,and adaptation compared with their parents.Nearly all annual crops exhibit heterosis to a certain extent[1].Heterosis is widely utilized in various crops including rice,maize,vegetables,and certain perennials[2];however,it cannot be stably inherited in subsequent seasons because of segregation,and hybrid seed production requires complex techniques and substantial resource consumption during every season[3].Apomixis is an asexual mode of seed reproduction that is observed in over 400 plant species.It produces clonal seeds and offspring that are genetically identical to the maternal parent[4].This mechanism has been proposed to revolutionize crop breeding by enabling the rapid fixation and effective utilization of heterosis and elite heterozygous genotypes[5].
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.
