LI Jun-Wen, JIA Fei, SUN Fu-Ding, LIU Ai-Ying, SHI Yu-Zhen, GONG Ju-Wu, SHANG Hai-Hong, WANG Tao, GONG Wan-Kui, JIA Xin-He, ZHANG Jian-Hong, YUAN You-Lu, HUA Jin-Ping
The recombinant inbred lines(RI) and immortalized F2 (IF2) populations derived from the cross between Gossypium hirsutum L. lines sGK9708×0-153 were used to detect quantitative trait loci(QTLs) underlying the number of cracked and open bolls (COP) and percentage of open bolls (POB). Field experiments were conducted in Quzhou, Hebei Province in 2009 and in Anyang, Henan Province, in 2009 and 2010. QTL analysis was conducted by the CIM method. Seven and 11 QTLs, which explained 5.86%~11.28% and 4.68%~9.84% of the phenotypic variation of COB and POB, respectively. Three, two, one, and one QTLs related to COB were located on chromosomes 25, 16, 18, and LG49, respectively; while six, two, two, and one QTLs related to POB were on chromosomes 25, 16, 18, and LG49, respectively. However, no common QTLs were detected in the RI and F2 populations. qPOB-16-2 was detected in the RI population in three environments, and qCOB-16-1, qPOB-5-3, and qPOB-25-4 were detected in two environments. These stable QTLs might be useful for molecular-assisted selection in future cotton breeding programs.