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Introgression of Day-Neutral Genes in Primitive Cotton Accessions: II. Predicted Genetic Effects

USDA-ARS, Crops Sci. Res. Lab., P.O. Box 5367, Mississippi State, MS 39762

J. Zhu

Agronomy Dep., Zhejiang Agriculture Univ., Hangzhou 310029, China

^* Corresponding author (jcm{at}ra.msstate.edu).

Primitive accessions of cotton, Gossypium hirsutum L., may provide useful traits for cultivar development. Genetic effects for yield, yield components, and fiber traits were analyzed for five generations of day-neutral progenies. The genetic material was derived from introgressing day-neutral genes from ‘Deltapine 16’ into 16 primitive accessions with single and multiple backcrosses creating 80 populations representing one to four doses of the unadapted accession. Yield and fiber traits were determined from field plot studies conducted for 3 yr. Significant accession effects were detected for all the traits studied. Significant generation main effects were found for three yield traits and one fiber trait. As expected, yield was predicted to decrease with more cycles of backcrossing to the accession. Accessions x generation interactions were detected for some traits which indicated that not all generations were having equal effects. This genetic analysis provides useful information when utilizing these accessions.

Received for publication September 16, 1996.

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