Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Proceedings
Publication Acceptance Date: June 1, 2000
Publication Date: N/A
Technical Abstract: Okra-leaf trait (Lo) confers earlier crop maturity in cotton and partial resistance to the silverleaf whitefly. Nectariless trait (ne) has been demonstrated to confer a partial resistance to the pink bollworm. These traits have been released in 2 Pima backgrounds for use by public and private breeders. Two traits were transferred into the cultivar Pima S-6 and into an early maturing line, P62, through backcrossing accompanied by selection. Yield, earliness of maturity, and fiber traits of the six germplasm lines were measured in replicated tests at Maricopa and Safford, AZ in 1998. There was a general trend toward lower yield among the okra- leaf lines, a location by genotype interaction was observed. At the low desert Maricopa location where significant heat stress occurred, PS-6neLo produced 216 kg ha-1 more lint than PS-6. Okra-leaf and okra-leaf - nectariless lines were earlier maturing than normal leaf parents. Line P62neLo matured 58% of total yield 162 days after planting - an increase o 20% over P62 and 32% over PS-6. All lines produced fiber within the extra- long staple fiber classification limits. The fiber lengths of PS-6neLo and P62neLo were shorter than the fiber of the recurrent parents, PS-6 and P62. The fiber strengths of PS-6neLo and P62neLo also were weaker than the fiber strengths of the recurrent parents PS-6 and P62. The 6 germplasm lines are available to breeders and other researchers in small seed quantities, and may be obtained by contacting the author.