Brasileiro B P, Silva S A, Souza D R, Santos P A, Oliveira R S, Lyra D H
Departamento de Estatística, Universidade Federal de Viçosa, Viçosa, MG, Brasil.
Genet Mol Res. 2013 Jul 8;12(3):2341-50. doi: 10.4238/2013.January.4.12.
The use of efficient breeding methods depends on knowledge of genetic control of traits to be improved. We estimated genetic parameters, selection gain, and genetic diversity in physic nut half-sib families, in order to provide information for breeding programs of this important biofuel species. The progeny test included 20 half-sib families in 4 blocks and 10 plants per plot. The mean progeny heritability values were: 50% for number of bunches, 47% for number of fruits, 35% for number of seeds, 6% for stem diameter, 26% for number of primary branches, 14% for number of secondary branches, 66% for plant height, and 25% for survival of the plants, demonstrating good potential for early selection in plant height, number of branches, and number of fruits per plant. In the analysis of genetic diversity, genotypes were divided into 4 groups. Genotypes 18, 19, 20, and 8 clustered together and presented the highest means for the vegetative and production. Lower means were observed in the 17, 12, 13, and 9 genotypes from the same group. We detected genetic variability in this population, with high heritability estimates and accuracy, demonstrating the possibility of obtaining genetic gains for vegetative characters and production at 24 months after planting.
高效育种方法的应用取决于对有待改良性状的遗传控制的了解。我们估算了麻风树半同胞家系的遗传参数、选择增益和遗传多样性，以便为这种重要生物燃料作物的育种计划提供信息。子代测定包括4个区组中的20个半同胞家系，每个小区种植10株。子代遗传力均值如下：果穗数为50%，果实数为47%，种子数为35%，茎直径为6%，一级分枝数为26%，二级分枝数为14%，株高为66%，植株成活率为25%，这表明在株高、分枝数和单株果实数方面进行早期选择具有良好潜力。在遗传多样性分析中，基因型被分为4组。基因型18、19、20和8聚集在一起，在营养和产量方面表现出最高均值。同一组中的基因型17、12、13和9的均值较低。我们在该群体中检测到了遗传变异性，遗传力估计值和准确性较高，这表明在种植24个月后有可能在营养性状和产量方面获得遗传增益。
