The simplified system (SS) is a new method of selecting families in the first experimentation phase used in some sugarcane (Saccharum officinarum L.) breeding programs in Brazil. In the SS, clones are obtained from families whose genotypes are not individualized in the field. Such selected clones are used to compose the cloned family trial. In the conventional method (CM) of breeding, each genotype is individualized to form part of the family evaluation experiment. This work aimed to compare and verify if the SS provides genetic information at least similar to the CM. Two experiments were conducted, one for the CM and the other for the SS. Sixty full-sib families were evaluated in each experiment. The characteristics evaluated were average stalk height, average stalk diameter, the content of total soluble solids (BRIX), the number of stalks per meter, average stalk mass, tonnes of stalks per hectare, and tonnes of BRIX per hectare. The mixed model methodology was used to estimate the genetic parameters and predict the families' genotypic values. Both methods enabled high precision in the evaluation of families and similar average genetic gains (10.1% for CM and 9.6% for SS). The SS makes it possible to select families with high genotypic value, high accuracy, and genetic gains comparable to the CM. Therefore, although the SS presents similar results as the CM, its simplicity and ease of being installed in the field in a smaller experimental area make it a promising methodology for selecting cloned families in a sugarcane breeding program.

中文翻译：

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甘蔗育种初期的家系选择方法比较

简化系统（SS）是在某些甘蔗（Saccharum officinarumL.) 巴西的育种计划。在 SS 中，克隆是从其基因型在该领域没有个体化的家庭获得的。此类选定的克隆用于组成克隆家庭试验。在传统的育种方法（CM）中，每个基因型都是个体化的，以形成家庭评估实验的一部分。这项工作旨在比较和验证 SS 是否提供至少与 CM 相似的遗传信息。进行了两个实验，一个用于 CM，另一个用于 SS。在每个实验中评估了 60 个全同胞家庭。评估的特征是平均茎高、平均茎直径、总可溶性固体 (BRIX) 含量、每米茎的数量、平均茎质量、每公顷茎的吨数和每公顷白利糖度的吨。混合模型方法用于估计遗传参数并预测家庭的基因型值。这两种方法都能够在评估家庭和相似的平均遗传增益方面实现高精度（CM 为 10.1%，SS 为 9.6%）。SS 使得选择具有高基因型价值、高精度和与 CM 相当的遗传增益的家族成为可能。因此，尽管 SS 呈现出与 CM 相似的结果，但它的简单性和易于安装在较小的实验区域的田间使其成为在甘蔗育种计划中选择克隆家庭的有前途的方法。SS 使得选择具有高基因型价值、高精度和与 CM 相当的遗传增益的家族成为可能。因此，尽管 SS 呈现出与 CM 相似的结果，但它的简单性和易于安装在较小的实验区域的田间使其成为在甘蔗育种计划中选择克隆家庭的有前途的方法。SS 使得选择具有高基因型价值、高精度和与 CM 相当的遗传增益的家族成为可能。因此，尽管 SS 呈现出与 CM 相似的结果，但它的简单性和易于安装在较小的实验区域的田间使其成为在甘蔗育种计划中选择克隆家庭的有前途的方法。