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Registration of GA98033 upland cotton germplasm line.

GA98033 cotton (Gossypium hirsutum L.) (Reg. no. GP-786, PI 634766) germplasm line was developed by the Georgia Agricultural Experiment Station (GAES) and released in 2004. GA98033 combines high yield potential, acceptable fiber quality, resistance to Fusarium will (caused by Fusariurn oxysporum Schlecht f. sp. vasinfectum Atk. Sny. & Hans.), and is conducive to plant regeneration through tissue culture somatic embryogenesis.

The pedigree of GA98033 is PD5529/'SG125'. PD5529 is a germplasm line with pedigree 'Deltapine 41'/PD6133 (Green et al., 1991), while SG125 is a SureGrow Seed cultivar with parentage 'Deltapine 50'/3*'DES 119' (Calhoun et al., 1997). The PD5529/SG125 [F.sub.1] was created in 1994, self-pollinated at the 1994-1995 USDA-ARS Cotton Winter Nursery in Mexico, and [F.sub.2] seed was then combined from about 15 [F.sub.1] plants. This bulk [F.sub.2] population was tested in a replicated trial in 1995 at Florence, SC and was selected for advance to the [F.sub.3] 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 [F.sub.3] plants were visually selected for boll production, were individually harvested, and subsequently planted to [F.sub.4] progeny rows in 1997. The [F.sub.3:4] progeny rows were visually compared with the nearest plots of 'SureGrow 501' for yield potential and [F.sub.4:5] seed of selects was bulked for replicated trials beginning in 1998. GA98033 derives from [F.sub.7:8] seed combined from selected plants within an [F.sub.7] seed increase plot produced in 2000 at Tifton, GA.

In 2002 or 2003 Official Cultivar Trials, GA98033 consistently yielded more than the popular cultivars Deltapine 448B, Deltapine 451BRR, Deltapine 458BRR, Deltapine 655BRR, Deltapine 5415RR, Deltapine 5690RR, FiberMax 991RR, FiberMax 989RR, Stoneville 5303RR, and Stoneville 5599BRR (USDA-AMS, 2003). Averaged over 2002 and 2003, lint yield of GA98033 exceeded (P < 0.10) that of Deltapine 448B, Deltapine 458BRR, Deltapine 5415RR, Deltapine 5690RR, FiberMax 989RR, and FiberMax 991RR in the University of Georgia Dryland and Irrigated Later Maturity Cultivar Trials (Day et al., 2003; 2004). Averaged over three trials comprising the 2002 South Carolina Cotton Cultivar Later Maturity Trials, GA98033 yielded more (P < 0.10) than Deltapine 448B, Delrapine 451BRR, Deltapine 655BRR, FiberMax 989BRR, Stoneville 5599BRR, and Stoneville 5303RR (Barefield, 2002). Lint fraction of GA98033 averaged 40% in the 2002 and 2003 Georgia trials, less (P < 0.10) than that of Stoneville 4892BR (42.1%), but greater (P < 0.10) than that of FiberMax 991RR (38.8%).

Fiber quality of GA98033 is mainly comparable to the cultivars listed above. For example, upper half mean fiber length measured by high volume instrument averaged 28.2 mm and length uniformity index of GA98033 averaged 83.5 %, equivalent to those of Deltapine 448B and Deltapine 458BRR (Day et al., 2003; Day et al., 2004). Averaged over 2002 and 2003 from the irrigated and nonirrigated University of Georgia Official cultivar trials (16 trials), fiber strength of GA98033 (312 kN m [kg.sup.-1]) was slightly greater than those of Deltapine 448B (287 kN m [kg.sup.-1]) and Deltapine 458BRR (303 kN m [kg.sup.-1]; P < 0.10). In the same 16 trials, micronaire reading of GA98033 (4.7) was not different than those of Deltapine 448B (4.6) and Deltapine 458BRR (4.8; P > 0.10).

GA98033 is embryogenic and has regeneration frequency from somatic embryos into plantlets similar to that of Coker 312 (Sakhanokho et al., 2004), a feature that may permit utility as a recipient of transgenic traits. Although the range of germplasm capable of embryogenesis has expanded in recent years, almost all commercial applications of cotton transformation are still performed in Coker 312 or close relatives (Rajasekaran et al., 2001). An embryogenic germplasm with yield potential commensurate or exceeding that of many currently popular cultivars could have value as a donor parent for new transgenic traits, compared with the agronomic potential of Coker 312 that was released in 1972 (Calhoun et al., 1997).

GA98033 expressed resistance to the Fusarium wilt infesting the 2002 National Cotton Fusarium Wilt Test (Glass et al., 2002). Seasonal percent wilted plants of GA98033 (5.3%) were not different than that of the resistant germplasm line M-315-RNR (0.8%; LSD 0.05 = 13.2%), but was significantly less than that of susceptible Rowden (56.5 %; Shepherd et al., 1996).

GA98033 should be useful to breeders as a source of high yield potential and acceptable fiber quality, and potentially molecular biologists for transformation research. Seed of GA98033 will be maintained by the GAES and 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 GA98033 is free of certain insects and pathogens specified on an import certificate, and in such instances seed of GA98033 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.

O.L. MAY, * P.W. CHEE, AND H. SAKHANOKHO

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 and Jennifer Vickers for technical assistance.

References

Barefield, D.K., Jr. 2002. 2002 Clemson University official cotton cultivars trials, http://www.clemson.edu/agronomy/vt/Cotton/Cotton-02. pdf; verified 15 July 2004

Calhoun, D.S., D.T. Bowman, and O.L. May. 1997. Pedigrees of upland and pima cotton cultivars released between 1970 and 1995. Miss. Agric. & Forestry Exp. Stn. Tech. Bull. 1069. 53 p.

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.

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. Expt. Stn., Athens, GA.

Glass, K.M., W.S. Gazaway, and E. VanSanten. 2002. 2002 national cotton fusarium wilt report. Auburn Agric. Exp. Stn., Auburn, AL. http://www.ag.auburn.edu/aaes/communications/agronomy/ ay246fusarium02.pdf; verified 15 July 2004

Green, C.C., T.W. Culp, and B.U. Kittrell. 1991. Registration of four germplasm lines of upland cotton with early maturity and high fiber quality. Crop Sci. 31:854.

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.

Rajasekaran, K., C.A. Chlan, and T.E. Cleveland. 2001. Tissue culture and genetic transformation of cotton, p. 269-280. In J.N. Jenkins and S. Saha (ed.) Genetic improvement of cotton. Science Publishers Inc., Enfield, NH.

Sakhanokho, H.F., P. Ozias-Akins, O.L. May, and P.W. Chee. 2004. Induction of somatic embryogenesis and plant regeneration in select Georgia and Pee Dee cotton lines. Crop Sci. 44:2199-2205 (this issue).

Shepherd, R.L., J.C. McCarty, Jr., J.N. Jenkins, and W.L. Parrott. 1996. Registration of nine cotton germplasm lines resistant to root-knot nematode. Crop Sci. 36:820.

USDA-AMS. 2003. Cotton varieties planted-2003 crop. USDA-AMS, Memphis, TN.

O.L. May and P.W. Chee, Dep. Crop & Soil Sci., Univ. Georgia, Coastal Plain Station, P.O. Box 748, Tifton, GA 31793-0748; and H. Sakhanokho, USDA-ARS, Small Fruits Research Unit, Poplarville, MS 39470. Registration by CSSA. Accepted 31 May 2004. * Corresponding author (lmay@tifton.uga.edu).

Published in Crop Sci. 44:2278-2279 (2004).
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Title Annotation:Registrations Of Germplasms
Author:May, O.L.; Chee, P.W.; Sakhanokho, H.
Publication:Crop Science
Date:Nov 1, 2004
Words:1313
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