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REGISTRATIONS OF GERMPLASMS

Registration of GA98066 Upland Cotton Germplasm Line

^a Dep. of Crop & Soil Sci., Univ. Georgia, Coastal Plain Station, P.O. Box 748, Tifton, GA 31793-0748
^b Cotton Incorporated, 6399 Weston Parkway, Cary, NC 27513

^* Corresponding author (lmay{at}tifton.uga.edu)

GA98066 cotton (Gossypium hirsutum L.) (Reg. no. GP-792, PI 635119) germplasm line was developed by the Georgia Agricultural Experiment Station (GAES) and released in 2004. GA98066 combines high yield potential, desirable fiber quality, and moderate resistance to Fusarium wilt (caused by Fusarium oxysporum Schlecht.:Fr. f. sp. vasinfectum Atk. Sny. & Hans.).

The pedigree of GA98066 is PD5363/GA88-186. PD5363 is a germplasm line with pedigree ‘Delcot 311’/PD6131 developed by the USDA-ARS (Green et al., 1991), while GA88-186 is an unreleased germplasm line with pedigree GA81-225/‘PD-1’ bred by the GAES. The PD5363/GA88-186 F₁ was created in 1994, self-pollinated at the 1994–1995 USDA-ARS Cotton Winter Nursery in Mexico, and F₂ seed was then bulked from three-hill increase plots planted with three to five F₁ seeds per hill. The PD5363/GA88-186 F₂ population along with additional half-sib F₂ populations was tested in a replicated trial in 1995 at Florence, SC. The PD5363/GA88-186 F₂–bulk population was selected for advance to the F₃ generation in 1996 because it had higher seed cotton yield (P < 0.10) than the trial check, germplasm line PD-3-14 (May et al., 1996). In 1996, F₃ plants were visually selected for greatest boll production and then were individually harvested. Subsequently selection for lint fraction, 2.5% fiber span length, and fiber bundle strength was practiced. Fiber quality analyses were conducted with single-instruments (Steadman, 1997). The remaining selections were planted as F₄ progeny rows in 1997. The F_3:4 progeny rows were visually compared with the nearest plot of ‘SureGrow 501’ for relative yield potential. Progeny rows visually rated as having higher seed cotton yield than SureGrow 501 were selected for advance to the F₅ generation. Bolls were combined from selected plants within each F₄ progeny row for advance to the F₅ generation and initiation of replicated testing in 1998 at Florence. GA98066 derives from F₅ seed harvested from one F₄ progeny row that was subsequently reselected in an F₇ Breeder seed increase in 2000 at Tifton, GA. Within the Breeder seed increase, F₈ seed was combined among selected F₇ plants and subsequently GA98066 was tested as though it was a pure line.

Advanced generation testing of GA98066 was conducted in the 2002 and 2003 Georgia Official Cultivar Trials and the 2002 South Carolina Official Cultivar Trials. Averaged over years and locations of the 2002 and 2003 Georgia Later Maturity Cotton Cultivar Trials, GA98066 yielded (P < 0.10) more than the popular cultivars Deltapine 448B, Deltapine 458BR, Deltapine 5415R, Deltapine 5690R, FiberMax 991R, and FiberMax 989R (Day et al., 2003, 2004). Averaged over three trials comprising the 2002 South Carolina Later Maturity Cotton Cultivar Trial, lint yield of GA98066 was not different than that of Deltapine 458BR and ‘Stoneville 4892BR’, but exceeded (P < 0.10) that of Deltapine 448B, ‘Deltapine 451BR’, ‘Deltapine 655BR’, ‘FiberMax 989BR’, ‘Stoneville 5599BR’, and ‘Stoneville 5303R’ (2002 Clemson University Official Cotton Cultivars Trials). Lint fraction of GA98066 averaged 39.6% in the 2002 and 2003 Georgia trials, less (P < 0.10) than that of ‘Deltapine 555BR’ (43.1%) and Stoneville 4892BR (42.1%), but greater (P < 0.10) than that of Deltapine 5690R (38.6%) and FiberMax 991R (38.8%).

GA98066 typically has longer upper-half mean fiber length, higher length uniformity index, greater bundle fiber strength, and lower micronaire readings than many popular cultivars produced in Georgia (Day et al., 2003, 2004). In the 2002 and 2003 Georgia Official Later Maturity Cotton Cultivar Trials, upper-half mean fiber length (29.5 mm) and uniformity index (84.2%) of GA98066 exceeded (P < 0.10) those of Deltapine 448B, Deltapine 458BR, Deltapine 5415R, Deltapine 5690R, FiberMax 989R, Stoneville 5599BR, and Stoneville 4892BR. Fiber strength of GA98066 (319 kN m kg^–1) was not different than that of Deltapine 5690R and FiberMax 989R, but exceeded (P < 0.10) those of Deltapine 448B, Deltapine 458BR, Deltapine 555BR, Deltapine 5415R, Stoneville 5599BR, and Stoneville 4892BR. Averaged over the same 16 trials, micronaire reading of GA98066 (4.6) was less (P < 0.10) than those of Stoneville 5599BR (4.9), Stoneville 4892BR (5.1), and Deltapine 5415R (4.9).

GA98066 is moderately resistant to Fusarium wilt. In the 2002 National Cotton Fusarium Wilt Test, seasonal percentage wilted plants of GA98066 (15%) were greater than that of the resistant control M-315-RNR (0.8%; LSD 0.05 = 13.2%), but was much less than that of the susceptible control Rowden (56.5%; Shepherd et al., 1996; Glass et al., 2002).

GA98066 may be useful to breeders as a source of high yield potential and fiber quality. Intellectual property rights will not be retained on GA98066, thus the use of GA98066 in cultivar development is unrestricted. For example, cultivar developers may use GA98066 as a recipient of transgenic traits followed by retention of intellectual property rights. Seed of GA98066 has been entered into the USDA National Plant Germplasm System for long-term curation and availability. Small quantities of seed (25 g) may be requested from the corresponding author. Requests for seed from outside the USA cannot be filled without an import certificate allowing the seed to enter the requestor's country. The University of Georgia may not be able to certify that seed of GA98066 is free of certain insects and pathogens specified on an import certificate, and in such instances seed of GA98066 cannot be supplied. Recipients of seed are asked to make appropriate recognition of the source of the germplasm if it is used in the development of a new cultivar, germplasm, parental line, or genetic stock.

ACKNOWLEDGMENTS

The authors thank Cotton Incorporated and the Georgia Cotton Commission for funding the breeding effort through State Support Project 00-860GA and Stephen Walker, Wade Bowen, Lisa Dean, Jonathan Markham, Corey Thompson, Jennifer Thompson, and Anna Wiltshire for technical assistance.

NOTES

Registration by CSSA.

Accepted for publication November 30, 2004.

REFERENCES

• Day, J.L., A.E. Coy, S.S. LaHue, W.D. Branch, O.L. May, L.G. Thompson, and P.A. Rose. 2004. Georgia 2003 peanut, cotton, and tobacco performance tests. Rep. 692. Georgia Agric. Exp. Stn., Athens, GA.
• Day, J.L., A.E. Coy, S.S. LaHue, L.G. Thompson, P.A. Rose, and J.P. Beasley. 2003. Georgia 2002 peanut, cotton, and tobacco performance tests. Rep. 686. Georgia Agric. Exp. Stn., Athens, GA.
• Glass, K.M., W.S. Gazaway, and E. VanSanten. 2002. 2002 National cotton fusarium wilt report [Online]. Available at www.ag.auburn.edu/aaes/communications/agronomy/ay246fusarium02.pdf (verified 2 Jan. 2005). Auburn Agric. Exp. Stn., Auburn, AL.
• Green, C.C., T.W. Culp, and B.U. Kittrell. 1991. Registration of two germplasm lines of upland cotton with high yield potential and fiber quality. Crop Sci. 31:853.[Free Full Text]
• May, O.L., C.C. Green, T.W. Culp, and D.S. Howle. 1996. Registration of PD-3-14 germplasm line of upland cotton. Crop Sci. 36:1718.[Free Full Text]
• Shepherd, R.L., J.C. McCarty, Jr., J.N. Jenkins, and W.L. Parott. 1996. Registration of nine cotton germplasm lines resistant to root-knot nematode. Crop Sci. 36:820.[Free Full Text]
• Steadman, R.G. 1997. Cotton testing. Textile Prog. 27:1–66.

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