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REGISTRATIONS OF GERMPLASMS

Registration of Arkot A306 and Arkot A314 Germplasm Lines of Cotton

^a Northeast Research and Extension Center, P.O. Box 48, Keiser, AR 72351
^b Dep. of Soil & Crop Sci., Texas A&M Univ., College Station, TX 77843-2474

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

Two germplasm lines of cotton (Gossypium hirsutum L.), designated Arkot A306 (Reg. no. GP-732, PI 617030) and Arkot A314 (Reg. no. GP-733, PI 617031), were developed by the Arkansas Agricultural Experiment Station and released in 2000. The lines possess agronomic, fiber strength, and host-plant resistance traits that make them valuable as breeding lines.

Arkot A306 (tested as A306-16) and Arkot A314 (tested as A314-07-20) were derived from crosses made in 1983 with one common parent, 752120, which was a selection from a cross of ‘Rex 713’/‘Delcot 277J’ (Sappenfield, 1979). The other parents of Arkot A306 and Arkot A314 were ‘DES 422’ (Bridge, 1982) and DES 210-23 (an advanced strain from the cross ‘Stoneville 7A’ by PD 2164 (Culp and Harrell, 1974) made in 1966), respectively.

Individual plant selections were made in 1985 from their respective F₂ populations with subsequent individual plant selections from F_2:3 progeny rows in 1986. These selections included A306-16 and A314-07 which were evaluated as F_3:4 progeny rows in 1988. Plants were bulked within F_3:4 progeny rows and evaluated as pure lines in replicated tests from 1989 through 1995. Individual plant selections were made from A306-16 and A314-07 in 1995. These were evaluated as progeny rows in 1996, with superior ones selected and evaluated as strains in 1997 and 1999 in Arkansas. One selection, A314-07-20, was considered to be superior to A314-07. None of the 1996 selections from A306-16 were retained separately.

Agronomic traits of Arkot A306 were compared to ‘DES 119’ in 23 tests from 1989 through 1995 at four Arkansas Agricultural Research Station sites in the Mississippi River Delta. Across all tests, Arkot A306 yielded 94% as much as DES 119, was earlier maturing (4% higher open boll percentage) and had higher fiber strength (12 kN m kg^-1 stronger). However, the line had lower lint percentage (1.5% less), shorter fiber length (1.3 mm less), and a lower fiber elongation (0.3% less) than DES 119.

In six Arkansas tests in 1997 and 1999, Arkot A314 was equal in yield and fiber length, was earlier maturing (4% higher open boll percentage at time of defoliation), and had higher HVI fiber bundle strength (4 kN m kg^-1 stronger) than ‘SureGrow 125’. Negatively, Arkot A314 had lower lint percentage (1.6% less), lower fiber elongation (0.9% less) and higher micronaire reading (0.15 units) than SureGrow 125.

In field tests conducted in 1994 and 1995, A314-07 was equal to DES 119 in resistance to tarnished plant bug, Lygus lineolaris (Palisot de Beauvois). Arkot A306 was more susceptible than DES 119, but more resistant than the frego-bract susceptible check. In the Regional Cotton Fusarium Wilt Test at Tallassee, AL, resistance of the two lines to fusarium wilt [caused by Fusarium oxysporum Schlect. f. sp. vasinfectum (Atk.) Snyd. & Hans.] was equal to the resistant check, ‘Auburn 56’ in 1991 (Johnson, 1992) and M-315 in 1995 (Glass and Gazaway, 1995). Arkot A314, a selection from A314-07, has not been evaluated for tarnished plant bug nor fusarium wilt resistance.

The relatively high strength, early maturity, and wide area of adaptation of Arkot A306 and Arkot A314 should make them valuable as breeding lines.

Small quantities of Arkot A306 and Arkot A314 seed may be obtained for breeding purposes from the corresponding author.

NOTES

Registration by CSSA.

Accepted for publication April 30, 2001.

REFERENCES

• Bridge, R.R. 1982. Registration of ‘DES 422’ cotton. Crop Sci. 22:1085[Free Full Text]
• Culp, T.W., and D.C. Harrell. 1974. Breeding quality of cotton at the Pee Dee Experiment Station, Florence, SC. USDA-ARS. Publ. ARS-5-30.
• Glass, K.M., and W.S. Gazaway. 1995. 1995 Regional cotton fusarium wilt report. Ala. Agric. Exp. Stn. Agronomy and Soils Dep. Series No. 189.
• Johnson, W.C. 1992. 1991 Regional cotton fusarium wilt report. Ala. Agric. Exp. Stn. Agron. and Soils Dep. Series 159.
• Sappenfield, W.P. 1979. Registration of Delcot 277J cotton. Crop Sci. 19:294.[Free Full Text]

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