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Northeast Research and Extension Center, P.O. Box 48, Keiser, AR 72351
* Corresponding author (bourland{at}uark.edu)
In 2001, the Arkansas Agricultural Experiment Station released a noncommercial cotton (Gossypium hirsutum L.) breeding line designated as Arkot 8727 (Reg. no. GP-743, PI 628637). Arkot 8727 was derived from crossing La. HG-063 (Jones et al., 1988) with the F1 of ‘DES 119’ (Bridge, 1986) and Miscot 7803-52 (Bourland and White, 1989). The cultivar H1330 was subsequently derived from the second parent (Bourland, 1996). Arkot 8727 possesses the high glanding (HG) characteristic, which is identified by the presence of gossypol glands on the calyx lobes. Calhoun (1997) indicated that a special GL3 allele was responsible for this HG phenotype. Gossypol glands on the calyx lobes are a strong deterrent and antibiotic factor against tobacco budworm (Heliothis virescens F.) (Parrott et al., 1989; Hedin et al., 1992).
Arkot 8727 (tested as 8727-21-10-02) was derived from an F3 individual plant selection made in 1989 using procedures of Bird (1982) modified to permit selection for lateral root development. Subsequently, additional individual plant selections based upon visual appearance were made in the F5 and the F8 generations. The resulting line was evaluated in 14 replicated field tests at four Arkansas Agricultural Experiment Station sites in the Mississippi River Delta from 1996 through 2000. Lint yields and maturity of Arkot 8727 were similar to ‘Stoneville 474’ at all four locations, indicating that the line possesses high yielding ability and a wide adaptive range. Fiber properties of Arkot 8727 were superior (6% longer, 7% stronger, and 6% lower in micronaire reading) to fiber properties of Stoneville 474. Average lint fraction of Arkot 8727 (38.8%) was lower than that of Stoneville 474 (41.4%). Leaves of Arkot 8727 are slightly less pubescent than those of Stoneville 474.
During selection, Arkot 8727 was screened for resistance to races 1, 2, 7, and 18 of Xanthomonas campestris pv. malvacearum (Smith) Dye, the causal agent of bacterial blight. Resistance to these races conveys resistance to all known U.S. races of this pathogen. In subsequent tests, Arkot 8727 has not exhibited symptoms of bacterial blight, even after field inoculations with the pathogen. In the presence of intense thrips (Frankliniella spp.) pressure in 2000, Arkot 8727 yielded significantly more fiber and had less relative plant injury than Stoneville 474. Incidence of Verticillium wilt (caused by Verticillium dahliae klebahn) on Arkot 8727 was significantly less than Stoneville 474 but more than ‘Sure-Grow 125’ at Clarkedale in 1999.
The combination of superior fiber properties, specific adaptation, and the high glanding trait of Arkot 8727 makes the line valuable in a cotton breeding program. Small quantities of Arkot 8727 seed may be obtained for breeding purposes from the corresponding author.
Development of Arkot 8727 was supported in part by funding from Cotton Incorporated.
NOTES
Accepted for publication January 31, 2002.
REFERENCES
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