G.hirsutum acc. TM-1, a genetic standard line of upland cotton, and G. barbadense cv. Hai7124, a commercial Sea island Verticillium-resistant cultivar, and living models
of their two ancestral genome donors, G. herbaceum var. africanum (A-genome) and G. raimondii Ulbrich (D-genome). All materials were grown under standard field conditions at the Pailou Experimental Field of the Nanjing Agricultural University, Jiangsu Province, China.