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An Evaluation of Gossypium barbadense L. Chromosomes 6 and 17 in the G. hirsutum L. Genome¹

The phenotypic contributions of two individual Gossypium barbadense L. chromosomes in a G. hirsutum L. background were evaluated. Monosomes 6 and 17 of G. hirsutum were used to transfer the individual intact homologues from a G. barbadense line (3-79) into G. hirsutum. Following transfer, backcross-derived substitution lines with 25 pairs of G. hirsutum chromosomes and one pair of G. barbadense chromosomes (6 or 17) were evaluated for the following agronomic properties: dateof first flower; earliness; yield; boll size; lint percent; lint index; seed index; fiber length; fiber coarseness; fiber strength; and fiber elongation. Significantly associated with substitution line 6 was later flowering, higher lint percent, and finer fibers. Short fiber length was significantly associated with substitution line 17. However, no characteristic feature of 3-79 was associated with either substitution line.

Key Words: Substitution lines • Monosomes • Introgression • Cotton

² Research geneticist, Oklahoma-Texas Area, Southern Region, ARS/USDA, College Station, Tex.; professor, Dep. of Plant Sciences, Univ. of Arizona, Tucson, Ariz.; and formerly geneticist, ARS/USDA, College Station, Tex.

Received for publication August 16, 1976.

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