Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract only
Publication Acceptance Date: 1/5/2006
Publication Date: 4/5/2006
Citation: Stipanovic, R.D., Puckhaber, L.S., Bell, A.A. 2006. Ratios of (+)- and (-)-gossypol in leaf, stems and roots of some gossypium hirsutum var. marie galante (watt) hutchinson accessions [abstract]. In: Proceedings of the Beltwide Cotton Conferences, January 3-6, 2006, San Antonio, Texas. 2006 CDROM. Interpretive Summary:
Technical Abstract: Cottonseed is underutilized as a feed source because of the presence of the toxic compound gossypol. Gossypol occurs as an enantiomeric mixture in the plant. The (-)-enantiomer is toxic to non-ruminant animals, but the (+)-enantiomer is not. Some accessions of the wild cotton Gossypium hirsutum var. marie galante have <8% (-)-gossypol in the seed. Thus, cottonseed derived from these accessions could potentially be utilized as a feed for non-ruminant animals. Gossypol and related compounds also occur in other parts of the plant where they protect the plant from attack by pathogens and insects. It is not known how plants derived from marie galante would resist these pests. In this paper we report the enantiomeric ratio of gossypol in the leaves, stems and roots of four accessions of G. hirsutum var. marie galante that show high, moderate-high and near normal levels of (+)-gossypol in the seed. We also report the total concentration of terpenoids in these tissues. These values are compared to the commercial cotton cultivar Stoneville 474. In the two marie galante accessions that have the highest level of (+)-gossypol in the seed (i.e., accessions #2452 and #2425), the percent (+)-gossypol and the concentration of total gossypol and the related terpenoids were significantly higher (P=0.05) in the stems and leaves compared to Stoneville 474. Our analyses indicate that progeny from these parents that retain these traits should show resistance comparable to the commercial cultivar to fungal pathogens and herbivorous insects.