Registration of five Arkot cotton germplasm lines derived from 2013 crosses

Arkot 1301 (Reg. no. GP-1152, PI 706424), Arkot 1308 (Reg. no. GP-1153, PI 706425), Arkot 1309 (Reg. no. GP-1154, PI 706426), Arkot 1311 (Reg. no. GP-1155, PI 706427), and Arkot 1317 (Reg. no. GP-1156, PI 706428) are conventional cotton (Gossypium hirsutum L.) germplasm lines released by the Arkansas Agricultural Experiment Station in November 2024. Arkot 1301 was derived from a cross of Arkot 0111 and Arkot 0222. The other four lines were derived from crossing an Arkot line with a line from another public cotton breeding program. Arkot 1309 and Arkot 1311 lines share MD10-5 as a common parent. The second parent for Arkot 1309 and Arkot 1311 was ‘UA48’ and Arkot 0222, respectively. Arkot 1317 was derived from crossing Arkot 0219 and MD87. Arkot 1308 came from crossing Arkot 0409 with GA2009100, an unreleased breeding line developed by the University of Georgia. Arkot 9111 was in parentage of all lines except Arkot 1309. In replicated field tests at four Arkansas sites over 5 years, the five lines produced equal or more lint yield than UA48 and ‘UA222’. Wide adaptation of the lines was indicated by high lint yields of lines in 2021 regional tests. All four lines displayed high resistance to bacterial blight. Plant (leaf, stem, and bract) trichomes, tarnished plant bug response, and yield component traits varied among the lines but were generally more like UA222 than UA48.