Brasileiro B P, Marinho C D, Costa P M A, Moreira E F A, Peternelli L A, Barbosa M H P
Departamento de Estatística, Universidade Federal de Viçosa, Viçosa, MG, Brazil.
Departamento de Estatística, Universidade Federal de Viçosa, Viçosa, MG, Brazil
Genet Mol Res. 2014 Jan 17;13(1):1650-60. doi: 10.4238/2014.January.17.2.
We evaluated the genetic diversity of 77 clones of sugarcane used in crosses made by the Brazilian interuniversity network for the development of the sugar/energy sector (RIDESA) breeding program. Characterization of the genotypes was carried out at the ratoon stage, based on eight morphological traits and seven agronomic traits. Diversity analysis was carried out beginning with the Ward-Modified Location Model. The ideal number of groups was three. Groups 1, 2, and 3 were composed of 37, 21, and 19 accessions, respectively. Group 1 was formed entirely of commercial varieties (hybrids of advanced generations) and elite clones, with the exception of the old varieties 'Caiana Fita' and 'Cana Blanca' (hybrids of Saccharum officinarum). In general, group 2 had more divergent accessions regarding origin, including L60-14, NG57-6, TUC77-42, IN84-105 (hybrid of S. officinarum), and 28NG289 (species of S. robustum). Group 3 was formed entirely of commercial varieties and elite clones from the RIDESA program, with the exception of genotypes Co285 (India), Q124 (Australia) and VAT90-212 (unknown origin). The analysis based on the Ward-Modified Location Model procedure resulted in an adequate and clearly discriminating grouping of sugarcane accessions, allowing the use of all the available information about the genotypes, in a mix of continuous and categorical variables.
我们评估了巴西大学间甘蔗能源领域发展网络（RIDESA）育种计划杂交所用的77个甘蔗克隆的遗传多样性。基于8个形态性状和7个农艺性状，在宿根期对基因型进行了表征。多样性分析从沃德修正位置模型开始。理想的分组数为3组。第1组、第2组和第3组分别由37份、21份和19份材料组成。第1组完全由商业品种（高世代杂交种）和优良克隆组成，但老品种‘Caiana Fita’和‘Cana Blanca’（甘蔗杂交种）除外。一般来说，第2组在起源方面有更多不同的材料，包括L60 - 14、NG57 - 6、TUC77 - 42、IN84 - 105（甘蔗杂交种）和28NG289（大茎野生种）。第3组完全由RIDESA计划的商业品种和优良克隆组成，但基因型Co285（印度）、Q124（澳大利亚）和VAT90 - 212（来源不明）除外。基于沃德修正位置模型程序的分析对甘蔗材料进行了充分且清晰的区分分组，允许在连续变量和分类变量混合的情况下使用关于基因型的所有可用信息。
