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CROP BREEDING, GENETICS & CYTOLOGY

Analysis of Resource Allocation in Final Stage Sugarcane Clonal Selection

USDA/ARS, Sugarcane Field Station, HCR Box 8, Canal Point, FL 33438

Corresponding author (jsbrown{at}saa.ars.usda.gov)

Superior genotypes of sugarcane (interspecific hybrids of Saccharum spp.) must continue to be developed with current resources as selection criteria evolve and expand. Developing future cultivars of sugarcane for the Everglades Agricultural Area (EAA) of South Florida with high water table tolerance and increased P-uptake efficiency could be an integral part of Everglades restoration. The objective of this study was to assess the current allocation of resources in the final selection phase of cultivar (clonal) development of the Canal Point, FL, sugarcane breeding program. Variance component analyses were conducted on elite genotypes from 7 yr of trials. Variance components were used to compare relative magnitudes of sources of variation and to explore more efficient use of resources. Variation attributable to crop x location interaction was nearly always the largest relative source of variation next to the residual term. The contributions to variance due to genotype x crop and genotype x location interactions were low, though these interactions cannot be discounted in cultivar release decisions. Variance due to replications was extremely low. Four statistics were used as metrics of experimental precision when reducing the number of replications. Reducing replications from eight to four did not compromise experimental precision. Removing the second-year planting sequence compromised little, if any, useful information for effective cultivar release decisions. Better allocation of resources could be achieved by alternative experimental design scenarios. Testing for high water table tolerance or P-uptake efficiency could also be included, improving ecological compatibility of agriculture in the EAA.

Abbreviations: CP, Canal Point, FL • EAA, Everglades Agricultural Area • GCV, Genetic Coefficient of Variation

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