Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract Only
Publication Acceptance Date: 12/11/2007
Publication Date: 1/11/2007
Citation: Bell, A.A., Puckhaber, L.S., Stipanovic, R.D. 2007. Development of high (+)-gossypol stocks and genetic control of the character [abstract]. Proceedings of the Beltwide Cotton Conferences, January 9-12, 2007, New Orleans, Louisiana. 2007 CDROM.
Technical Abstract: The toxicity of gossypol to animals apparently is due primarily to the (-)-enantiomer. Thus, converting gossypol to its (+)-enantiomer should detoxify it. Eight accessions of moco cottons (Gossypium hirsutum var. marie galante) with high (+)-gossypol were crossed with modern cultivars then (+)-gossypol contents of flower petals and seed were determined in the F1, BC1F1, BC2F1, BC3F1, BC3S1 and BC3S2 generations. The results showed that elevated (+)-gossypol concentrations were due to two major genes designated G1+ and G2+. The gene G2+ was dominant and expressed mostly in flower petals, whereas G1+ was mostly recessive and expressed equally in flower petals and seed. Plants with homozygous G1+ contained about 90% (+)-gossypol in seed. Adding G2+ in the homozygous condition, further increased the percentage to about 95%. A homozygous stock (BC3S2) with 95% (+)-gossypol has been developed and will be released to produce seed for animal feeding experiments.