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Registration of 'CP 97-1944' sugarcane.

'CP 97-1944' (Reg. no. CV-126, PI 639109) sugarcane (a complex hybrid of Saccharum officinarum L., S. barberi Jeswiet, S. spontaneum L., and S. sinense Roxb. amend. Jeswiet) was selected from progeny of a polycross made at Canal Point, FL, in November 1994 with 'CP 80-1743' (Deren et al., 1991) as the female parent. CP 97-1944 was developed through cooperative research conducted by the USDA-ARS, the University of Florida, and the Florida Sugar Cane League, Inc. and was released to growers in December 2004.

CP 97-1944 has no pubescence along the leaf sheath, short auricles (<0.5 cm), and a nearly cylindrical internode. It has moderate wax bloom, a loosely adhering leaf sheath, and a dark purple stalk, both exposed and under the leaf sheath. The buds of CP 97-1944 project below purple growth rings, and its purple root bands usually have two rows of root primordia.

Stalk weights of CP 97-1944, averaged over the plant-cane, first-ratoon, and second-ratoon crops, were 12.9% lower on organic soils and 17.1% lower on sand soils than the corresponding stalk weights of 'CP 70-1133' (Rice et al., 1978), the commercial check. CP 97-1944 has an average fiber content of 10.9% compared with 10.4% for CP 70-1133.

On organic soils, CP 97-1944 was evaluated at nine locations over a three-crop cycle (nine plant-cane, nine first- and six second-ratoon crops) where its cane yield (Mg cane [ha.sup.-1]) was 2.0% higher than that of CP 70-1133. Theoretical recoverable sucrose (kg sucrose [Mg.sup.-1] cane) of CP 97-1944 was 6.4% higher than that of CP 70-1133. Its sucrose yield (Mg sucrose [ha.sup.-1]) was 8.4% higher than that of CP 70-1133. The theoretical economic index, which integrates the costs of harvesting, hauling, and milling the cane produced with sucrose content (Derenet al., 1995) of CP 97-1944 was 15.6% higher than that of CP 70-1133 on organic soils.

On sand soils, CP 97-1944 was evaluated at two locations across a three-crop cycle (two plant-cane, two first- and one second-ratoon crops). The cane yield of CP 97-1944 in these tests was 4.5% lower than that of CP 70-1133. Theoretical recoverable sucrose content for CP 97-1944 was 7.0% higher and its sucrose yield was 1.8% higher than that of CP 70-1133. The theoretical economic index on sand soils for CP 97-1944 was 7.9% higher than that of CP 70-1133.

CP 97-1944 has shown field resistance in Florida to eye spot [caused by Bipolaris sacchari (E.J. Butler) Shoemaker]; rust (caused by Puccinia melanocephala Syd. & P. Syd.); smut (caused by Ustilago scitaminea Syd. & P. Syd.); and Sugarcane mosaic virus strain E. CP 97-1944 is susceptible to Sugarcane yellow leaf virus, and is moderately susceptible to leaf scald [caused by Xanthomonas albilineans (Ashby) Dowson] and ratoon stunting disease (caused by Leifsonia xyli subsp, xyli Evtushenko et al.). Susceptibility to ratoon stunting disease was based on the presence of colonized vascular bundles in inoculated tests.

CP 97-1944 was released because of its high cane and sugar yields and its resistance to the major and minor sugarcane diseases in Florida except sugarcane leaf scald, yellow leaf virus, and ratoon stunting disease. Nearly all sugarcane cultivars in Florida are susceptible to Sugarcane yellow leaf virus. The levels of leaf scald on CP 97-1944 were similar to those quantified on its maternal parent, CP 80-1743, which has sustained high yields since its release in 1991. Ratoon stunting disease can be managed by using disease-flee planting material.

Vegetative planting material will be maintained by USDAARS at the Sugarcane Field Station, Canal Point, FL, for five years and is available through the National Plant Germplasm System.

References

Deren, C.W., J. Alvarez, and B. Glaz. 1995. Use of economic criteria for selecting clones in a sugarcane breeding program. Proc. Int. Soc. Sugar Cane Technol. 21(2):437-447.

Deren, C.W., B. Glaz, P.Y.P. Tai, J.D. Miller, and J.M. Shine, Jr. 1991. Registration of 'CP 80-1743' sugarcane. Crop Sci. 31:235-236.

Rice, E.R., J.D. Miller, N.I. James, and J.L. Dean. 1978. Registration of 'CP 70 1133' sugarcane. Crop Sci. 18:256.

J.C. COMSTOCK, B. GLAZ, * S.J. EDME, R.A. GILBERT, J.D. MILLER, P.Y.P. TAI, J.W. DUNCKELMAN, AND J.O. DAVIDSON

J.C. Comstock, B. Glaz, S.J. Edme, J.D. Miller (retired), and P.Y.P. Tai (retired), USDA-ARS Sugarcane Field Station, 12990 US Highway 441 N, Canal Point, FL 33438; R.A. Gilbert, Univ. of Florida, Everglades Res. and Educ. Ctr., 3200 East Palm Beach Road, Belle Glade, FL 33430; J.W. Dunckelman (formerly) and J.O. Davidson (formerly), Florida Sugar Cane League, Inc., P.O. Box 1208, Clewiston, FL 33440. Registration by CSSA. Accepted 30 April 2005. * Corresponding author (bglaz@saa.ars.usda.gov).

doi:10.2135/cropsci2005.0175
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Author:Comstock, J.C.; Glaz, B.; Edme, S.J.; Gilbert, R.A.; Miller, J.D.; Tai, P.Y.P.; Dunckelman, J.W.; Da
Publication:Crop Science
Geographic Code:1U5FL
Date:Nov 1, 2005
Words:810
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