Registration of a Tufted-Naked Seed Upland Cotton Germplasm, 9023n4 t

Abstract

A tufted-naked cotton (Gossypium hirsutum L.) mutant, 9023n4t (Reg. No. GP-971, PI 667553) was developed from the cultivar SC 9023 (9023) (PI 590933) through chemical mutagenesis. Germplasm line 9023n4t was developed by the Department of Plant and Soil Science, Texas Tech University, and released in 2013. This mutant has reduced density of short fibers (fuzz) remaining attached to the seed after spinnable fibers lint, are removed, with only a small amount of fuzz attached to the micropylar end of the seed. In 1997, seed of 9023 was treated with 2.45% ethyl methane sulfonate (EMS). The treated seed was hand planted in the field at Lubbock, TX, in 1997. In 1999, one M3 plant was identified that produced seed with the tufted-naked trait. An M6:7 progeny uniform for the trait was identified in 2003 and designated as 9023n4t. During 2004 to 2007 and in 2011, the mutant, along with 9023 and USDA Cotton Collection accession 143 (n2n2) (PI 528543) and accession 243 (N1N1) (PI 528610), both having no fuzz remaining after removal of spinnable fibers, were tested in replicated tests. The lint percentage of 9023n4t was not significantly lower than that of the wild-type and was 39% higher than the lint percentage of accession 143 (n2n2) and 57% higher than accession 243 (N1N1). The mutant had 15% lower high volume instrument (HVI) short fiber content and 45% lower seed coat neps. Germplasm 9023n4t required less net energy to gin and ginned faster compared with some standard cotton cultivars.