Genetic parameters were evaluated for growth and cone characteristics(tree height,diameter at breast height,volume,cone number,thousand seeds weight and single cone seeds weight)on 86 half-sib families of Pinus koraie...Genetic parameters were evaluated for growth and cone characteristics(tree height,diameter at breast height,volume,cone number,thousand seeds weight and single cone seeds weight)on 86 half-sib families of Pinus koraiensis aged 31 years.Analyses of variance revealed significant differences(p<0.001)in all growth and cone traits among families while no significant differences were detected among blocks and the interaction between blocks and families.The average family values for growth traits were 17.22 m,8.67 cm and 0.43 m^(3) for tree height,diameter at breast height and volume,respectively.The average cone number,thousand seeds weight and single cone seeds weight were 17.57,748.91 g and 77.25 g,respectively.Genotypic additive variance and phenotypic variances ranged from 0.00009 to 3.820 and from 0.0005 to 23.066,while genotypic and phenotypic coefficients of variation ranged from 2.693%to 37.196%and 4.963%to 60.595%,respectively.Heritability at the individual and family level ranged from 0.152 to 0.215 and 0.611 to 0.862,respectively.Growth traits were significantly positively correlated with each other,but cone traits showed a weak correlation with growth traits.Based on 10% selection rate,nine families each were selected as elite materials in terms of high performance in volume and cone numbers,with 22.16%and 43.82%genetic gain in volume and cone number,respectively.These results provide beneficial information to select excellent families and establish orchards of P.koraiensis from improved seeds.展开更多
The seedling height and ground diameter of 42 half-sib families of biennial Cyclobalanopsis glauca were investigated and compared. The results showed that there were extremely significant differences between different...The seedling height and ground diameter of 42 half-sib families of biennial Cyclobalanopsis glauca were investigated and compared. The results showed that there were extremely significant differences between different families in the terms of seedling height and ground diameter. According to the seedling height and ground diameter, families 39, 27, 28 and 19 of C. glauca were superior to other families at the seedling stage.展开更多
To investigate the genetic variation patterns of multiple traits in Pinus sibirica half_sibling families introduced to the Greater Khingan Range,this study aims to establish a comprehensive trait evaluation system bas...To investigate the genetic variation patterns of multiple traits in Pinus sibirica half_sibling families introduced to the Greater Khingan Range,this study aims to establish a comprehensive trait evaluation system based on genetic parameters and identify fast-growing,high-quality genetic materials.The findings provide scientific support for advanced-generation seed orchard development and multiobjective genetic improvement.A total of 66 half-sibling families from a 26-year-old trial plantation of the Tomsk seed source were evaluated.Eleven traits were measured,including growth traits(tree height,diameter at breast height,volume,and crown width),morphological traits(lateral branch diameter),wood quality traits(Pilodyn value),and needle traits(fresh weight,dry weight,moisture content,needle length,and needle width).Genetic parameters were estimated using variance component decomposition.Superior families with favorable performance in both growth and wood density traits were identified using Best Linear Unbiased Prediction(BLUP)weighted by genetic correla-tion coefficients.Additionally,individual tree selection was conducted based on growth traits using the index selection method.Significant genetic differences among families(Z ratio>1.50)were observed for 10 traits,including growth,wood density,and needle traits.The phenotypic coefficient of variation(PCV:5.05%-62.50%)and genetic coefficient of variation(GCV:2.19%-13.81%)exhibited substantial heterogeneity.Volume displayed the highest variation(PCV=62.50%,GCV=13.81%),while the highest family heritability was observed for the needle length-to-width ratio(h^(2)=78.30%),and the highest individual heritability was rec-orded for needle moisture content(H^(2)=95.22%).Genetic correlations analysis revealed strong positive associ-ations between volume and tree height(r=0.880),diameter at br-east height(r=0.968),and Pilodyn value(r=0.508).Using the BLUP method,13 superior families(e.g.,Families 59,11 and 51)were identified,with an average genetic gain in volume of 13.377%and a family retention rate of 70%,significantly exceeding the population mean(65.10%).Th-rough index selection,94 elite individual trees were selected,52.14%of which originated from superior families.The genetic gain in individual tree volume reached 26.80%,with the within family gain for elite individuals increasing to 28.47%.This study establishes the first multitrait genetic evaluation model for P.sibirica and proposes a“familyindividual”collaborative selection strategy.The selected superior families achieved avolume genetic gain of 3.864%-32.307%and an overall geneticgain of 2.729%-20.069%,while elite individual trees exhibited a volume genetic gain of 16.328%-52.716%.These findings would provide critical technical support for multi-objective breeding and seed orchard development in cold-temperate coniferous species.展开更多
The maize population Csyn 4 was improved for three cycles with three recurrent selection methods MS1, MS1-HS, and MHSRRS in northern China. A total of 40 NC Ⅱ testcrosses were made by four testers with Csyn 4 and 10 ...The maize population Csyn 4 was improved for three cycles with three recurrent selection methods MS1, MS1-HS, and MHSRRS in northern China. A total of 40 NC Ⅱ testcrosses were made by four testers with Csyn 4 and 10 improved populations, which were evaluated in four environments in the cropping season of 2005. Analysis of variance indicated a significant progress （P〈 0.05） in yield and other chief agronomic traits in the improved populations and testcrosses, demonstrating that the three recurrent selection methods were effective for increasing grain yield of testcrosses and improvement of general combining ability in maize population. The average grain yield increase of population Csyn 4 in MS1, MS1-HS, and MHSRRS recurrent selections was 266.7 kg ha^-1 （5.3%）, 288.0 kg ha^-1 （5.7%）, and 231.3 kg ha^-1 （4.6%） per cycle, while the grain yield of S 1 progeny of population for Csyn 4 was increased by 420.0 kg ha^-1 （10.9%）, 376.0 kg ha^-1 （9.8%）, and 414.7 kg ha^-1 （10.8%） per cycle in MS1, MS1-HS, and MHSRRS recurrent selections, respectively. Linear responses （b） in the MS1, MS1-HS, and MHSRRS recurrent selections were the same as the realized responses of the selection （G） for grain yield increase of Csyn 4 and S1 progeny of the populations. The grain yield of testcrosses increased by 3.3-5.2% on average per cycle. The value of heterosis did not display any differences amongst the different cycles of selections. The GCA for yield component traits of population Csyn 4 was improved significantly by means of three selection methods, whereas the GCA for plant height, ear height, days to silking, and days to pollen did not show significant increase in the recurrent selections. GCA for the number of tassel branches were decreased in the selections, while GCA for the number of plant leaves were increased, but the difference was not significant.展开更多
基金We are grateful to the Applied Technology Research and Development Planned Program of Heilongjiang Province(GA19B201-4)for supporting this research.
文摘Genetic parameters were evaluated for growth and cone characteristics(tree height,diameter at breast height,volume,cone number,thousand seeds weight and single cone seeds weight)on 86 half-sib families of Pinus koraiensis aged 31 years.Analyses of variance revealed significant differences(p<0.001)in all growth and cone traits among families while no significant differences were detected among blocks and the interaction between blocks and families.The average family values for growth traits were 17.22 m,8.67 cm and 0.43 m^(3) for tree height,diameter at breast height and volume,respectively.The average cone number,thousand seeds weight and single cone seeds weight were 17.57,748.91 g and 77.25 g,respectively.Genotypic additive variance and phenotypic variances ranged from 0.00009 to 3.820 and from 0.0005 to 23.066,while genotypic and phenotypic coefficients of variation ranged from 2.693%to 37.196%and 4.963%to 60.595%,respectively.Heritability at the individual and family level ranged from 0.152 to 0.215 and 0.611 to 0.862,respectively.Growth traits were significantly positively correlated with each other,but cone traits showed a weak correlation with growth traits.Based on 10% selection rate,nine families each were selected as elite materials in terms of high performance in volume and cone numbers,with 22.16%and 43.82%genetic gain in volume and cone number,respectively.These results provide beneficial information to select excellent families and establish orchards of P.koraiensis from improved seeds.
基金Supported by Special Scientific Research Project for Forestry Public Welfare Industry(201504301)
文摘The seedling height and ground diameter of 42 half-sib families of biennial Cyclobalanopsis glauca were investigated and compared. The results showed that there were extremely significant differences between different families in the terms of seedling height and ground diameter. According to the seedling height and ground diameter, families 39, 27, 28 and 19 of C. glauca were superior to other families at the seedling stage.
基金funded by the Key Science and Technology Program of the State Forestry Administration(Project No.:2001-31(1))the Scientific Research Project of Greater Khingan Range Forestry Group Co.,Ltd.(Project No.:s2023001)。
文摘To investigate the genetic variation patterns of multiple traits in Pinus sibirica half_sibling families introduced to the Greater Khingan Range,this study aims to establish a comprehensive trait evaluation system based on genetic parameters and identify fast-growing,high-quality genetic materials.The findings provide scientific support for advanced-generation seed orchard development and multiobjective genetic improvement.A total of 66 half-sibling families from a 26-year-old trial plantation of the Tomsk seed source were evaluated.Eleven traits were measured,including growth traits(tree height,diameter at breast height,volume,and crown width),morphological traits(lateral branch diameter),wood quality traits(Pilodyn value),and needle traits(fresh weight,dry weight,moisture content,needle length,and needle width).Genetic parameters were estimated using variance component decomposition.Superior families with favorable performance in both growth and wood density traits were identified using Best Linear Unbiased Prediction(BLUP)weighted by genetic correla-tion coefficients.Additionally,individual tree selection was conducted based on growth traits using the index selection method.Significant genetic differences among families(Z ratio>1.50)were observed for 10 traits,including growth,wood density,and needle traits.The phenotypic coefficient of variation(PCV:5.05%-62.50%)and genetic coefficient of variation(GCV:2.19%-13.81%)exhibited substantial heterogeneity.Volume displayed the highest variation(PCV=62.50%,GCV=13.81%),while the highest family heritability was observed for the needle length-to-width ratio(h^(2)=78.30%),and the highest individual heritability was rec-orded for needle moisture content(H^(2)=95.22%).Genetic correlations analysis revealed strong positive associ-ations between volume and tree height(r=0.880),diameter at br-east height(r=0.968),and Pilodyn value(r=0.508).Using the BLUP method,13 superior families(e.g.,Families 59,11 and 51)were identified,with an average genetic gain in volume of 13.377%and a family retention rate of 70%,significantly exceeding the population mean(65.10%).Th-rough index selection,94 elite individual trees were selected,52.14%of which originated from superior families.The genetic gain in individual tree volume reached 26.80%,with the within family gain for elite individuals increasing to 28.47%.This study establishes the first multitrait genetic evaluation model for P.sibirica and proposes a“familyindividual”collaborative selection strategy.The selected superior families achieved avolume genetic gain of 3.864%-32.307%and an overall geneticgain of 2.729%-20.069%,while elite individual trees exhibited a volume genetic gain of 16.328%-52.716%.These findings would provide critical technical support for multi-objective breeding and seed orchard development in cold-temperate coniferous species.
文摘以榆林国家樟子松良种基地樟子松优树子代测定林半同胞家系为研究材料,测定树高、胸径、材积等生长数据,进行方差分析和各性状间的相关性分析,估算遗传力、变异系数、遗传增益、育种值等遗传参数。树高的家系平均值为4.89 m,胸径的家系平均值为10.82 cm,材积的家系平均值为0.0248 m 3,不同家系间的生长表现存在较大的差异。树高、胸径、材积3个生长性状在不同家系均存在极显著差异,3个性状在不同家系间存在丰富的遗传变异。树高、胸径、材积的单株遗传力分别为0.687、0.587、0.571,家系遗传力分别为为0.729、0.697、0.684,树高、胸径、材积的遗传变异系数分别为22.25%、21.89%、35.97%,各性状的遗传力和遗传变异系数均较大。以家系材积育种值为家系选择指标,以70%的入选率选出较为优良的36个家系,在每一个家系内选出单株材积最大者为第二代种子园建园亲本。
文摘The maize population Csyn 4 was improved for three cycles with three recurrent selection methods MS1, MS1-HS, and MHSRRS in northern China. A total of 40 NC Ⅱ testcrosses were made by four testers with Csyn 4 and 10 improved populations, which were evaluated in four environments in the cropping season of 2005. Analysis of variance indicated a significant progress （P〈 0.05） in yield and other chief agronomic traits in the improved populations and testcrosses, demonstrating that the three recurrent selection methods were effective for increasing grain yield of testcrosses and improvement of general combining ability in maize population. The average grain yield increase of population Csyn 4 in MS1, MS1-HS, and MHSRRS recurrent selections was 266.7 kg ha^-1 （5.3%）, 288.0 kg ha^-1 （5.7%）, and 231.3 kg ha^-1 （4.6%） per cycle, while the grain yield of S 1 progeny of population for Csyn 4 was increased by 420.0 kg ha^-1 （10.9%）, 376.0 kg ha^-1 （9.8%）, and 414.7 kg ha^-1 （10.8%） per cycle in MS1, MS1-HS, and MHSRRS recurrent selections, respectively. Linear responses （b） in the MS1, MS1-HS, and MHSRRS recurrent selections were the same as the realized responses of the selection （G） for grain yield increase of Csyn 4 and S1 progeny of the populations. The grain yield of testcrosses increased by 3.3-5.2% on average per cycle. The value of heterosis did not display any differences amongst the different cycles of selections. The GCA for yield component traits of population Csyn 4 was improved significantly by means of three selection methods, whereas the GCA for plant height, ear height, days to silking, and days to pollen did not show significant increase in the recurrent selections. GCA for the number of tassel branches were decreased in the selections, while GCA for the number of plant leaves were increased, but the difference was not significant.
