|SANDHU, HARDEV - University Of Florida|
|DAVIDSON, WAYNE - Florida Sugar Cane League|
|GILBERT, ROBERT - University Of Florida|
|GLYNN, NEIL - Syngenta, Inc|
Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/19/2014
Publication Date: 12/22/2014
Citation: Zhao, D. Comstock, J.C., Sandhu, H.S., Glaz, B., Edmé, S.J., Davidson, R.W., Sood, S., Gilbert, R.A., McCorkle, K., and Glynn, N.C. 2015. Registration of ‘CP 06-2400’ Sugarcane. Journal of Plant Registrations. 9:71-77.
Interpretive Summary: Interpretive Summary: Sugarcane is an important crop in south Florida. Sugarcane in this region contributes approximately 25% of U.S. domestic sugar production. New sugarcane cultivars are needed that yield well on organic (muck) soils and/or sand soils and have acceptable resistance to major diseases because approximately 80% of sugarcane grows on muck soils in Florida. Field data from three crops (plant cane and first- and second-ratoon crops) at multiple locations suggest CP 06-2400 yielded well in commercial sugarcane fields on muck soils, but its yield was similar to that of check cultivar CP 78-1628 on sand soils. On muck soils at seven locations, Compared with CP 72-2086 and CP 89-2143 (two check cultivars for muck soils), CP 06-2400 had 52 and 38% higher cane yields, respectively and 44 and 26% higher sucrose yields. The three-year mean value of sugar content (commercial recoverable sucrose) of CP 06-2400 was 7.9 and 4.1% lower, respectively, than those of CP 72-2086 and CP 89-2143 on muck soils. The economic index of CP 06-2400 was significantly (42 and 17%) higher than those of CP 72-2086 and CP 89-2143 on muck soils, but did not differ from that of either CP 89-2142 or CP 78-1628 on sand soils. Therefore, CP 06-2400 was released to growers as a new cultivar for muck soils only in Florida. CP 06-2400 has shown adequate resistance or tolerance to smut, leaf scald, brown rust, orange rust, sugarcane mosaic virus, and ratoon stunting for commercial production on muck soils, but is susceptible to sugarcane yellow leaf virus as are almost all sugarcane cultivars in Florida. CP 06-2400 was also high tolerance to mild freezing temperatures. The commercial release of CP 06-2400 makes available to Florida growers a cultivar that maintains high yields on muck soils in the presence of diseases. It is expected that CP 06-2400 will help to sustain sugarcane production in Florida.
Technical Abstract: Technical Abstract: ‘CP 06-2400’ (Reg. No. ; PI 670018) sugarcane (a complex hybrid of Saccharum spp.) was developed through cooperative research conducted by the USDA-ARS, the University of Florida, and the Florida Sugar Cane League, Inc. and released to growers for organic (muck) soils in Florida in October 2013. CP 06-2400 was selected from a polycross made at Canal Point, FL on 16 Jan. 2004 with cultivar CP 94-1100 as the female parent. The male parent could be any one of the clones used in the polycross. CP 06-2400 was released because of its high cane and sucrose yields and acceptable commercial recoverable sucrose (CRS) on muck soils, and its acceptable levels of resistance to brown rust (caused by Puccinia melanocephala H. & P. Sydow), orange rust (caused by Puccinia kuehnii E.J. Butler), leaf scald [caused by Xanthomonas albilineans Ashby, Dowson], Sugarcane mosaic virus strain E (mosaic), ratoon stunt (caused by Leifsonia xyli subsp. xyli Evtsuhenko et al.), and smut [caused by Sporisorium scitamineum (Syd.) M. Piepenbring et al.] in Florida. Based on results of 17 harvests of three crops (plant cane, first ratoon, and second ratoon) in the final-stage replicated yield trials conducted at six locations on muck soils and compared with two reference cultivars CP 89-2143 and CP 72-2086, CP 06-2400 had 38.2 and 52.0% higher cane yield and 26.4 and 44.1% higher sucrose yield, respectively (P < 0.01). CP 06-2400 ranked 2nd to 3rd best for freeze tolerance among 21 genotypes field tested for temporal sucrose deterioration.