|Gilbert, Robert - UNIVERSITY OF FLORIDA|
Submitted to: Sandland Sugarcane Field Day
Publication Type: Abstract Only
Publication Acceptance Date: March 20, 2009
Publication Date: March 20, 2009
Citation: Glynn, N.C., Gilbert, R.A., Glaz, B.S., Edme, S.J., Comstock, J.C., Tai, P.Y., Miller, J.D. 2009. Early Stage Selection Repeatability: Can We Learn Anything from the Past?. Sandland Sugarcane Field Day. Paper Presentation only. Technical Abstract: The sugarcane cultivar development program at Canal Point involves several stages of variety selection and advancement. Stage 2 of this program involves the evaluation of approximately 1500 clones and the advancement of approximately 135 clones to Stage 3 based on objective, quantitative yield data. Sugarcane clones in Stage 3 are evaluated at four locations three of which are muck soils and one sand soil, this procedure has been in place for 25+ years. Correlation analysis was used to examine the overall repeatability of Stage 2 with Stage 3 yield data; Tonnes of Cane per Acre (TCA), Total Recoverable Sucrose (TRS), Tonnes of Sucrose per Acre (TSA) and Economic Index (EI) in data from each of 23 Canal Point series’ between 1982 and 2004. Repeatability between Stage 2 data and Stage 3 on muck and sand soil locations was examined on data from the 1995 – 2004 Canal Point series using correlation analysis and also the changes in ranking position. Overall repeatability between Stage 2 and Stage 3 varied by series but was generally poor with the best correlations observed for TRS followed by TCA, TSA and EI. The relationship between Stage 2 and Stage 3 muck locations was also poor yet improved compared to Stage 3 sand soil locations. The average change in rankings of varieties between Stage 2 and Stage 3 was greater for Stage 3 sand than Stage 3 muck soils for all four traits.