Lopes K V, Teodoro P E, Silva F A, Silva M T, Fernandes R L, Rodrigues T C, Faria T C, Corrêa A M
Departamento de Fitotecnia, Universidade Estadual de Mato Grosso do Sul, Aquidauana, MS, Brasil.
Laboratório de Biometria, Departamento de Biologia Geral, Universidade Federal de Viçosa, Viçosa, MG, Brasil
Genet Mol Res. 2017 May 18;16(2):gmr-16-02-gmr.16029559. doi: 10.4238/gmr16029559.
Estimating genetic parameters in plant breeding allows us to know the population potential for selecting and designing strategies that can maximize the achievement of superior genotypes. The objective of this study was to evaluate the genetic potential of a population of 20 cowpea genotypes by estimating genetic parameters and path analysis among the traits to guide the selection strategies. The trial was conducted in randomized block design with four replications. Its morphophysiological components, components of green grain production and dry grain yield were estimated from genetic use and correlations between the traits. Phenotypic correlations were deployed through path analysis into direct and indirect effects of morphophysiological traits and yield components on dry grain yield. There were significant differences (P < 0.01) between the genotypes for most the traits, indicating the presence of genetic variability in the population and the possibility of practicing selection. The population presents the potential for future genetic breeding studies and is highly promising for the selection of traits dry grain yield, the number of grains per pod, and hundred grains mass. A number of grains per green pod is the main determinant trait of dry grain yield that is also influenced by the cultivar cycle and that the selection for the dry grain yield can be made indirectly by selecting the green pod mass and green pod length.
估算植物育种中的遗传参数，有助于我们了解群体在选择和设计策略方面的潜力，从而使优良基因型的选育成果最大化。本研究的目的是通过估算遗传参数和性状间的通径分析，评估20个豇豆基因型群体的遗传潜力，以指导选择策略。试验采用随机区组设计，重复4次。从遗传利用和性状间的相关性估算其形态生理组成、绿色籽粒产量组成和干籽粒产量。通过通径分析将表型相关性分解为形态生理性状和产量组成对干籽粒产量的直接和间接效应。大多数性状在基因型间存在显著差异（P < 0.01），表明群体中存在遗传变异，具备进行选择的可能性。该群体具有未来遗传育种研究的潜力，在干籽粒产量、每荚粒数和百粒重等性状的选择上极具前景。每绿荚粒数是干籽粒产量的主要决定性状，且受品种生育期影响，通过选择绿荚质量和绿荚长度可间接选择干籽粒产量。
