Elite genotypes for the evaluation of crosses in sugarcane genetic breeding
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Abstract
Efficient sugarcane breeding programs require availability of diverse germplasm and they are facilitated by formulation of appropriate selection strategies and procedures. The objective of the present study is the detection and use of genotypes or elite individuals as a criterion for the evaluation of crosses of the Sugarcane Breeding Program in the southeastern region of Cuba. The data from the selection evaluations of the stages of the genetic breeding scheme belonging to clonal propagation 1, 2 and replicated studies (period 2000-2014) were used. A classification algorithm was established to detect elite individuals on the variables diameter, stem length and refractometric brix compared to the control cultivar. The repeatability of the individuals and crosses where the elite individuals were classified from one stage to the other was determined. It was possible to detect the crosses that provide elite individuals, with significantly higher values in the clonal selection stage 2 to replicated studies than in the first clonal selection stage. The repeatability of the elite individuals in the clonal selection stages increases in the final stages of selection with respect to the initial one. The effectiveness of classification of these elite individuals in becoming recommended cultivars was 28.3 % when detected in clonal stage 1 compared to 85.3 % in clonal stage 2.
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