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REGISTRATION OF GERMPLASM

Registration of Arkot 8606, an Early-Maturing Cotton Germplasm Line

Northeast Research and Extension Center, P.O. Box 48, Keiser, AR 72351

* Corresponding author (bourland{at}uark.edu)

Arkot 8606 (Reg. no. GP-740, PI 628634), a very early maturing cotton (Gossypium hirsutum L.) breeding line was released in 2001 by the Arkansas Agricultural Experiment Station. Arkot 8606 (tested as 8606-50) was derived from a cross of ‘DES 119’ (Bridge, 1986) and Miscot 7813 (Bourland, 1987), and was developed from an F₃ individual plant selection made in 1988 by means of the procedures of Bird (1982), modified to permit selection for lateral root development. Arkot 8606 was evaluated in replicated field tests at four Arkansas Agricultural Experiment Station sites in the Mississippi River Delta from 1991 through 1996, and again in 2000.

In 21 field tests from 1991 through 1996, lint yields, lint fractions, and fiber properties of Arkot 8606 were very similar to DES 119. In 12 tests where maturity was rated prior to defoliation, Arkot 8606 averaged 67% open bolls compared with 55% for DES 119. Compared with ‘Stoneville 474’ in four tests conducted in 2000, Arkot 8606 yielded 15% less, had a lower lint fraction (36.1 vs 40.2%), and was 19% shorter in plant height. Fiber properties of Arkot 8606 were similar to those of Stoneville 474. Over all tests, Arkot 8606 yielded relatively better at northern Arkansas locations than at Rohwer (southeast Arkansas). Arkot 8606 is characterized as "hairy leaf", but its leaves are less pubescent than DES 119 or Stoneville 474.

During selection, Arkot 8606 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 8606 has not exhibited symptoms of bacterial blight even after field inoculations with the pathogen. In the 1994 Regional Cotton Fusarium Wilt Test at Tallassee, AL, resistance of Arkot 8606 to Fusarium wilt [caused by Fusarium oxysporum Schlect. f. sp. vasinfectum (Atk.) Snyd. & Hans.] was equal to the resistant check. In the presence of intense thrips, Frankliniella spp., pressure in 2000, Arkot 8606 yielded more and had less relative injury than Stoneville 474.

The fiber properties and specific adaptation of Arkot 8606 are unusual in such an early maturing genotype. This combination of traits makes the line valuable as a breeding line. Small quantities of Arkot 8606 seed may be obtained for breeding purposes from the corresponding author.

Development of Arkot 8606 was supported in part by funding from Cotton Incorporated.

NOTES

Registration by CSSA.

Accepted for publication January 31, 2002.

REFERENCES

• Bird, L.S. 1982. The MAR (Multi-Adversity Resistance) system for genetic improvement of cotton. Plant Dis. 66:172–176.
• Bourland, F.M. 1987. Registration of Miscot 7813 and Miscot 7841 germplasm lines of cotton. Crop Sci. 27:367.[Free Full Text]
• Bridge, R.R. 1986. Registration of ‘DES 119’ cotton. Crop Sci. 26:646–647.[Free Full Text]

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