Dias Luiz Antônio dos Santos, Picoli Edgard Augusto de Toledo, Rocha Rodrigo Barros, Alfenas Acelino Couto
Departamento de Biologia Geral, BIOAGRO, Universidade Federal de Viçosa, Viçosa, MG, Brasil.
Genet Mol Res. 2004 Sep 30;3(3):356-68.
Plant breeding deals with high-yielding genotypes. However, how best to choose parents of these genotypes remains an unsolved question. Here, we focus on a priori choice based on parental distances by means of agronomic and molecular data. Despite numerous theoretical and empirical studies, a priori choice continues to be a controversial procedure. Both success and failure are commonly reported. We looked at these ambiguous results in order to investigate their possible causes. A total of 139 articles on genetic divergence were sampled to examine aspects such as type and number of markers utilized. We suggest that the mean number of 160, 281 and 25 for RAPD and RFLP markers, and SSR loci, respectively, which we found in these papers, should be increased for accurate analysis. A second sample composed of 54 articles was used to evaluate the divergence-heterosis association. Most of them (28) detected positive divergence-heterosis association, whereas 26 revealed negative or inconclusive results. We examined several causes that influence a priori choice positively and negatively.
植物育种涉及高产基因型。然而，如何最好地选择这些基因型的亲本仍然是一个未解决的问题。在此，我们通过农艺和分子数据，关注基于亲本距离的先验选择。尽管有大量的理论和实证研究，但先验选择仍然是一个有争议的程序。成功和失败的案例都屡见不鲜。我们研究了这些模棱两可的结果，以探究其可能的原因。总共抽取了139篇关于遗传差异的文章，以考察所使用标记的类型和数量等方面。我们建议，为了进行准确分析，我们在这些论文中分别发现的RAPD和RFLP标记以及SSR位点的平均数量（分别为160、281和25）应该增加。第二个样本由54篇文章组成，用于评估差异与杂种优势的关联。其中大多数（28篇）检测到差异与杂种优势呈正相关，而26篇则显示出负相关或不确定的结果。我们研究了一些对先验选择产生正负影响的原因。
