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Generation Mean Analysis of Near‐Long‐Staple Fiber Length in TAM 94L‐25 Upland Cotton
Author(s) -
Smith C. W.,
Braden C. A.,
Hequet E. F.
Publication year - 2009
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2008.12.0706
Subject(s) - heritability , biology , fiber , randomized block design , horticulture , evolutionary biology , chemistry , organic chemistry
The U.S. traditionally markets upland cotton with a high volume instrument (HVI) upper‐half mean length (UHML) of 27 mm (34 staple) although international trade requires a minimum of 27.8 mm (35 staple). Genotypes have been developed that exhibit UHML of approximately 30 mm (∼38 staple) that are referred to as near‐long‐staple uplands (NLSU). The objective of this research was to determine gene action and heritability for near‐long‐staple length in a unique set of upland cotton genotypes. TAM 94L‐25, an NLSU, was crossed with three programmatically diverse NLSU phenotypes and a short‐staple upland (SSU) to produce the F 1 , F 2 , BCP 1 , and BCP 2 generations for generation mean analysis (GMA). Generations were grown in a randomized complete block design at College Station, TX in 2001 and 2002. Seedcotton was ginned on a laboratory gin and advanced fiber instrument system (AFIS) fiber properties were determined. Additional improvement in fiber length is possible by crossing TAM 94L‐25 with the other NLSU phenotypes included in this study. Environment affected genetic expression with narrow sense heritability (h 2 ) for fiber length generally lower in the TAM 94L‐25/NLSU families. Transgressive segregates were found in all families.