Better understanding of the genetic control of traits in breeding populations is crucial for the selection of superior varieties and parents. This study aimed to assess genetic parameters and breeding values for six essential traits in a white Guinea yam (Dioscorea rotundata Poir.) breeding population. For this, pedigree‐based best linear unbiased prediction (P‐BLUP) was used. The results revealed significant nonadditive genetic variances and medium to high (.45–.79) broad‐sense heritability estimates for the traits studied. The pattern of associations among the genetic values of the traits suggests that selection based on a multiple‐trait selection index has potential for identifying superior breeding lines. Parental breeding values predicted using progeny performance identified 13 clones with high genetic potential for simultaneous improvement of the measured traits in the yam breeding program. Subsets of progeny were identified for intermating or further variety testing based on additive genetic and total genetic values. Selection of the top 5% progenies based on the multi‐trait index revealed positive genetic gains for fresh tuber yield (t ha⁻¹), tuber yield (kg plant⁻¹), and average tuber weight (kg). However, genetic gain was negative for tuber dry matter content and Yam mosaic virus resistance in comparison with standard varieties. Our results show the relevance of P‐BLUP for the selection of superior parental clones and progenies with higher breeding values for interbreeding and higher genotypic value for variety development in yam.

中文翻译：

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利用系谱信息对几内亚白山药早期繁殖种群的遗传参数，预测和选择

更好地了解育种种群性状的遗传控制对于选择优良品种和亲本至关重要。这项研究旨在评估白色几内亚山药（Dioscorea rotundata）的六个基本性状的遗传参数和育种值Poir。）繁殖种群。为此，使用了基于谱系的最佳线性无偏预测（P‐BLUP）。结果表明，所研究性状具有显着的非加性遗传变异和中高（0.45-0.79）广义遗传力估计值。这些性状的遗传值之间的关联模式表明，基于多重性状选择指数的选择具有识别优良育种系的潜力。使用子代表现预测的育种值可以鉴定出13个具有高遗传潜力的克隆，可同时改善薯类育种程序中测得的性状。确定子代的子集，以便根据加性遗传和总遗传价值进行间断或进一步的品种测试。^-1），块茎产量（kg植株^-1）和平均块茎重量（kg）。但是，与标准品种相比，块茎干物质含量和山药花叶病毒抗性的遗传增益为负值。我们的结果表明，P‐BLUP与选择具有较高育种育种价值和具有较高基因型价值的山核桃品种育种的优良亲本克隆和后代具有相关性。