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GERMPLASM

Registration of Arkot 9704 and Arkot 9706 Germplasm Lines of Cotton

^a Univ. of Arkansas Division of Agriculture Northeast Research and Extension Center, P.O. Box 48, Keiser, AR 72351
^b Cotton Incorporated, 6399 Weston Pkwy., Cary, NC 27513

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

ABSTRACT

Arkot 9704 (Reg. No. GP-914, PI 654509) and Arkot 9706 (Reg. No. GP-915, PI 654510) are noncommercial breeding lines of cotton (Gossypium hirsutum L.) that were released by the Arkansas Agricultural Experiment Station in August 2008. Both lines were derived from 1997 crosses using one common parent, Ark 9108-04, a breeding line from which Arkot 9108 was selected. The second parent for Arkot 9704 was M331RKN. The other parent of Arkot 9706 was Arkot 8712. The lines were evaluated in 15 replicated tests in Arkansas from 2004 through 2007 and compared to check cultivars SG 105 and PSC 355. Lint yields of Arkot 9704 and Arkot 9706 were equal to the check cultivars. Yields of both lines could be attributed in part to higher lint per seed (and lint fraction) produced by fewer seed per area than either check cultivar. Arkot 9706 was earlier maturing than Arkot 9704 and the two check cultivars. Fiber properties of Arkot 9706 were very similar to PSC 355, whereas Arkot 9704 produced lower micronaire, length uniformity index, and strength than Arkot 9706 and PSC 355. Leaf pubescence and bract trichome density of Arkot 9704 were less dense than either check cultivar, whereas Arkot 9706 was similar to SG 105 for these traits. Both lines expressed resistance to bacterial blight. Arkot 9704 expressed resistance to tarnished plant bug equal to PSC 355, whereas Arkot 9706 expressed higher resistance than either check cultivar. The relative yield, maturity, and line-specific host plant resistance traits make these lines valuable to cotton breeding programs.

Abbreviations: RBTN, Regional Breeders' Testing Network