|DAVIDSON, WAYNE - Florida Sugar Cane League|
|SANDHU, HARDEV - University Of Florida|
|MILLIGAN, SCOTT - Monsanto Corporation|
|HU CHEN, JIAN - Us Sugar Corporation|
|GILBERT, ROBERT - University Of Florida|
|GLYNN, NEIL - Syngenta, Inc|
Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/30/2015
Publication Date: 1/4/2016
Citation: Edme, S.J., Davidson, W.R., Zhao, D., Comstock, J.C., Sandhu, H.S., Glaz, B.S., Milligan, S.A., Hu Chen, J., Sood, S.G., Mccorkle, K.M., Gilbert, R.A., Glynn, N.C. 2016. Registration of ‘CPCL 05-1201’ Sugarcane. Journal of Plant Registrations. 10:14-21.
Interpretive Summary: Sugarcane is an important crop in the economy of South Florida where it is planted annually on about 400,000 acres. Sustaining production on the farms requires continuous improvement and release of newer varieties with higher yielding (sugar and weight) ability and with tolerance or resistance to a plethora of diseases that exist in Florida. Up to the year 2005, two research programs were involved in breeding sugarcane for Florida: the USDA-ARS as a public program established in Canal Point and the US Sugar Corp. or USSC, as a private program established in Clewiston. CPCL 05-1201 is a cultivar that was bred in 2002 by USSC (so the CL in the name) and tested for seven years through the USDA program (so the CP in the name) after the closure of the breeding division at USSC. In the final stage of selection, CPCL 05-1201 was tested against 21 other varieties across three crop-years (2008-2012) for yield performance and disease evaluation at three locations with sand soils and at seven locations with organic (muck) soils. The freeze tolerance of the 22 varieties was also assessed in North Florida (Hague) for two crop-years (2010-2012). On muck soils, CPCL 05-1201 was on average 5-10% more productive than either CP 89-2143 or CP 78-1628, two important commercial varieties used as checks. On sand soils, the yield performance of CPCL 05-1201 was similar to that of CP 89-2143 and 4% better than that of CP 78-1628. The higher sucrose yield of CPCL 05-1201 came from high tonnage, moderate sucrose content, and good rationing ability. Consequently, CPCL 05-1201 was recommended for planting on organic soils in Florida where it outperformed its competitors by 9-13% in profitability. CPCL 05-1201 was also recommended for planting on sand soils where it is expected to be 24-29% more profitable than either CP 89-2143 or CP 78-1628. No significant yield decline was observed with CPCL 05-1201 when tested under the ‘successive’ cropping system used in Florida. Moreover, CPCL 05-1201 is resistant to the most important diseases in Florida, such as brown rust, orange rust, mosaic, smut, leaf scald, ratoon stunt, and eyespot. CPCL 05-1201 tested positive for the presence of the Bru1, a gene that confers resistance to brown rust in sugarcane. CPCL 05-1201 is, however, susceptible to the Sugarcane yellow leaf virus, a minor sugarcane disease in Florida. CPCL 05-1201 has good tolerance to mild and severe freeze conditions in the field.
Technical Abstract: CPCL 05-1201 is a sugarcane (Saccharum spp.) hybrid bred by US Sugar Corporation in 2002 and tested for seven years through the cooperative breeding program led by the USDA-ARS, the University of Florida, and the Florida Sugar Cane League, before its release to Florida growers in Oct. 2012. CPCL 05-1201 is a product of a cross that combined the high-sucrose genes from its female parent (‘CL 87-2882’) with the high tonnage genes of its male parent (‘CL 93-2679’). In the final stage of selection, the yield and disease performance of CPCL 05-1201 were appraised against those of 21 other genotypes in three crop-years (2008-2012) on seven organic and three sand soil locations in south Florida and the freeze tolerance was evaluated for two crop-years (2011-2013) in north Florida. CPCL 05-1201 was recommended for planting on both organic and sand soils and for the ‘successive’ cropping system in Florida. On muck, CPCL 05-1201 produced 5-10% higher sucrose yield than CP 78-1628 or CP 89-2143. On sand, CPCL 05-1201 is expected to yield comparable sucrose as CP 89-2143 and 4% more than CP 78-1628. Owing to high tonnage, a moderate level of sucrose, and good ratooning ability, CPCL 05-1201 is expected to be 9-13% more profitable on muck and 24-29% more profitable on sand than either CP 78-1628 or CP 89-2143. Moreover, no significant yield decline was observed with CPCL 05-1201 when planted under the ‘successive’ cropping system. CPCL 05-1201 is resistant to most of the economically important diseases in Florida, at the exception of the sugarcane yellow leaf virus. CPCL 05-1201 has the Bru1 gene in its genome and was found to be resistant to brown rust (caused by Puccinia melanocephala H. & P. Sydow) and to orange rust (caused by P. kuehnii). CPCL 05-1201 has comparable freeze tolerance as CP 89-2143 under mild and severe freeze conditions.