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REGISTRATIONS OF GERMPLASMS

Registration of TAM 96WD-18 Upland Cotton Germplasm Line with Improved Fiber Length and Strength

^a Dep. of Soil and Crop Sciences, Texas Agric. Exp. Stn., Texas A&M Univ. System, College Station, TX 77843-2474
^b Cotton Incorporated, 6399 Weston Parkway, Cary, NC 27513

^* Corresponding author (pthaxton{at}ag.tamu.edu). Registration

TAM 96WD-18 upland cotton (Gossypium hirsutum L.) germplasm (Reg. no. GP-789, PI 635879) developed by the Cotton Improvement Laboratory, Department of Soil and Crop Sciences, Texas Agricultural Experiment Station was released in 2004 as part of an ongoing effort to create germplasm and cultivars with improved yield potential and fiber quality. TAM 96WD-18 is a pubescent leaf and stem line that combines high yield potential with excellent fiber qualities. TAM 96WD-18 is a midseason maturity, picker-type upland cotton with a growth habit similar to ‘Deltapine 50’ when grown with supplemental irrigation at College Station and is adapted to south and central Texas.

TAM 96WD-18 was derived by hybridization and pedigree selection at Weslaco, TX, followed by early generation evaluation in south Texas. TAM 96WD-18 resulted from the cross of TAM 87G³–27, a breeding line with pedigree AET-108/1209-619-2S-77//PD 6992 developed in the Cotton Improvement Lab (Smith and Niles, 1994), and TAM 88G-104, a high-yielding picker-type upland cotton with resistance to silverleaf whitefly [Bemesis argentifolli (Perring and Bellows)] (Smith, 2001). TAM 88G-104 was developed from the cross of ‘Deltapine 90’ (Calhoun et al., 1994) and CS-8606 (Smith and Niles, 1988), and released as ‘Texas 418’. TAM 96WD-18 was derived from a single F_2:3 plant selected on the basis of its apparent yield potential, fiber properties, and overall plant conformation. The resulting F_3:4 progeny row was selected as a pure line for further evaluation under the name of 96WD-18.

Field evaluations of TAM 96WD-18 were conducted from 1998 to 2002 at three to eight locations in Texas (Weslaco, Corpus Christi, San Patricio County, College Station, Thrall, Uvalde, Dallas, and Chillicothe) for yield, gin turnout, and fiber quality. TAM 96WD-18 was performance tested in preliminary strain trials during 1999 and 2000 at Weslaco, Corpus Christi, and College Station, TX, and the following two years at all eight locations. In the various performance tests, TAM 96WD-18 was compared with Deltapine 50 (Calhoun et al., 1994), ‘Sure-Grow 125’ (Calhoun et al., 1994), and ‘Tamcot Sphinx’ (El-Zik and Thaxton, 1996), popular cultivars in south and central Texas in the late 1990s. Deltapine 50 was not used as a check cultivar after 2000 because of its decline in popularity, while ‘FiberMax 832’ replaced Sure-Grow 125 in 2001 because of its excellent fiber quality and large production areas in south and central Texas.

Compared with Sure-Grow 125, Tamcot Sphinx, and FiberMax 832, TAM 96WD-18 was not different (P = 0.05) in yield in performance trials averaged over eight locations in 2001 and 2002. Over locations, TAM 96WD-18 expressed a lower gin turnout (P = 0.05) than the same cultivars. The average upper-half mean fiber length of TAM 96WD-18 was similar to FiberMax 832, and 48% longer than those of Tamcot Sphinx and Sure-Grow 125 (P = 0.05). The mean fiber bundle strength of TAM 96WD-18 averaged 6% lower (P = 0.05) than that of FiberMax 832 but was 7 and 17% stronger, respectively, than those of Tamcot Sphinx and Sure-Grow 125. Averaged across eight locations and two years (2001-2002), micronaire readings of TAM 96WD-18 were 2% lower than FiberMax 832, 12% lower than Tamcot Sphinx, and 11% lower than those of Sure-Grow 125 and Tamcot Sphinx (P = 0.05). Micronaire readings of TAM 96WD-18 deviated from the Commodity Credit Corporation defined base range of 3.5 to 4.9 in only three of 23 performance trials between 2000 and 2002, indicating a low tendency to produce fiber with undesirably high micronaire readings.

Research leading to the development of TAM 96WD-18 was supported in part by grants from the Texas Food and Fibers Commission and Cotton Incorporated's Texas State Support program. Small quantities of TAM 96WD-18 seed may be obtained for breeding purposes from the corresponding author.

NOTES

Registration by CSSA.

Accepted for publication November 30, 2004.

REFERENCES

• Calhoun, D.S., D.T. Bowman, and O.L. May. 1994. Pedigrees of upland and pima cotton cultivars released between 1970 and 1990. Miss. Agric. For. Exp. Stn. Bull. 1017. Mississippi State, MS.
• El-Zik, K.M., and P.M. Thaxton. 1996. Registration of ‘Tamcot Sphinx’ cotton. Crop Sci. 36:1074.[Free Full Text]
• Smith, C.W. 2001. Registration of TAM 88G–104 high-yielding upland cotton germplasm. Crop Sci. 41:1369–1370.[Free Full Text]
• Smith, C.W., and G.A. Niles. 1988. Registration of fourteen cotton germplasm lines. Crop Sci. 28:578–579.[Free Full Text]
• Smith, C.W., and G.A. Niles. 1994. Registration of four upland cotton germplasm lines having improved fiber quality: TAM 86G³–30, TAM 87D³–24, TAM 87D³–2527, and TAM 87G³–27. Crop Sci. 34:1413–1414.[Free Full Text]

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