Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: March 10, 2009
Publication Date: May 26, 2009
Citation: Milligan, S.B., Davidson, R.W., Edme, S.J., Comstock, J.C., Hu, C.J., Holder, D.G., Glaz, B., Glynn, N.C., Gilbert, R.A. Registration of ‘CPCL 97-2730’ Sugarcane. Journal of Plant Registrations. 3:158-164. 2009.
Interpretive Summary: Sugarcane is grown on organic (muck) and sand soils in a region near Lake Okeechobee in south Florida. This region contributes about 25% of U.S. domestic sugar production. New cultivars are needed that yield well on both soil types and have acceptable profiles of disease resistance, but only rarely are such cultivars identified. For more than 30 years, one public and one private program developed new sugarcane cultivars for Florida. In 2004, the private program of United States Sugar Corporation, located in Clewiston (CL), FL, was discontinued and much of their genetic material was donated to a cooperative program located at a USDA-ARS facility in Canal Point (CP), FL where ARS, University of Florida, and Florida Sugar Cane League, Inc. scientists cooperate in the development of new sugarcane cultivars. When it was donated to the CP (public) program, the name of CL 97-2730 was changed to CPCL 97-2730. Experimental data of CPCL 97-2730 suggest that it will have high yields on sand soils in Florida. On sand soils, the sugar content of CPCL 97-2730 was similar to that of CP 78-1628, the reference cultivar for sand soils; CPCL 97-2730 and CP 78-1628 also had similar cane yields. Due to their similar sugar contents and cane yields, the three-crop mean sugar per hectare yield and economic index for CPCL 97-2730 were also similar to those of CP 78-1628. Cultivar resistance and tolerance are the major sources of sugarcane disease control in Florida, but they are challenging to identify and quantify, because plants are growing and therefore exposed to disease pressures all year. CPCL 97-2730 has shown adequate resistance for commercial production in Florida to eye spot, smut, leaf scald, brown rust, orange rust, sugarcane mosaic virus, and ratoon stunting. CPCL 97-2730 is susceptible to sugarcane yellow leaf virus, but its high yields in experimental plots were obtained regardless of this susceptibility. The commercial release of CPCL 97-2730 makes available to Florida growers a cultivar that maintains high yields on sand soils in the presence of diseases, and therefore should help to continue providing the U.S. an affordable and stable sugar supply. Additionally, CPCL 97-2730 may be tested by farmers in Central America, who grow mostly Canal Point (CP) cultivars. CPCL 97-2730 was released in December 2008.
Sugarcane grown in a concentrated region near Lake Okeechobee in Florida produces 25% of the sugar produced in the U.S. The development of a constant supply of new sugarcane cultivars helps growers to respond to economic, pathological, and ecological pressures. The purpose of this research was to test yields and disease resistance of promising new sugarcane genotypes in the plant-cane, first-ratoon, and second-ratoon crops in commercial fields at two commercial sugarcane sites in Florida. CPCL 97-2730, an outstanding genotype in these tests, was selected in a private program conducted by the United States Sugar Corp. among the progeny of a cross of between sugarcane genotype CL 75-0853 (female flower) and proprietary commercial cultivar CL 88-4730 (male flower). This private program was discontinued in 2004 and CPCL 97-2730 donated to a public program located at a USDA-ARS facility at Canal Point, FL. Final testing of CPCL 97-2730 was then accomplished through cooperative research of this public program conducted by the USDA-ARS, the University of Florida-Institute of Food and Agricultural Sciences, and the Florida Sugar Cane League, Inc., and was released in December 2008. In experiments on sand soils, CPCL 97-2730 yields were compared with those of cultivar CP 78-1628. The mean stalk weights of CPCL 97-2730, CP 72-2086, and CP 89-2143, were 1.3, 1.6, and 1.4 kg, respectively; and the stalk weights of CPCL 97-2730 and CP 78-1628 were 1.2 and 0.9 kg, respectively. Cane yields for CPCL 97-2730 and CP 78-1628 were 107.1 and 99.2 tons per ha, respectively; and sucrose yields were 14.23 and 12.89 tons per ha, respectively. CPCL 97-2730 is susceptible to sugarcane yellow leaf virus. Otherwise, CPCL 97-2730 has shown adequate resistance to all other major diseases in Florida. Based on its sugar and tonnage yields on sand soils that are similar to those of the commercial check, CP 78-1628, in the presence of diseases prevalent in Florida, CPCL 97-2730 may make a substantial commercial contribution to sugarcane production on sand soils in Florida.