Registration of Five Exotic Germplasm Lines of Cotton Derived from Multiple Crosses among Gossypium Tetraploid Species

Abstract

Species polycross (SP) cotton germplasm was developed from multiple crosses among Gossypium tetraploid species. SP156 (Reg. No. GP‐903, PI 654087), SP177 (Reg. No. GP‐904, PI 654088), SP179 (Reg. No. GP‐905, PI 654089), SP205 (Reg. No. GP‐906, PI 654090), and SP225 (Reg. No. GP‐907, PI 654091) were released by the USDA‐ARS for their highly desirable combinations of yield, yield components, and fiber properties. The SP lines were tested for yield and fiber quality in 2005, 2006, and 2007 at six year‐locations. SP179 and SP225 averaged 1221 and 1348 kg ha−1, respectively, for yield in three years' trials compared with 1359 kg ha−1 for ‘Deltapine 555BR’. Fiber bundle strength of these two lines is 233 and 228 kN m kg−1, respectively, compared with 227 kN m kg−1 for ‘FiberMax 960B2R’ (FM960B2R). Yields of SP156, SP177, and SP205 are at least 7% higher than the average, 965 kg ha−1, of FM960B2R and ‘Phytogen 72’ (PHY72). Strength of SP156, SP177, and SP205 is 241, 238, and 236 kN m kg−1, respectively, compared with 241 kN m kg−1, the average of FM960B2R and PHY72. Span length and short fiber content in these lines are also comparable to FM960B2R and PHY72.