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United States Department of Agriculture

Agricultural Research Service

Research Project: TOWARD CONTROL STRATEGIES OF EMERGING PATHOGENS AND NEMATODES OF COTTON Title: Disease resistance of cotton hybrids with different level of total and different ratios of (+)- to (-)-Gossypol in seeds

Authors
item Namazov, Shadman -
item Bell, Alois
item Stipanovic, Robert
item Marupov, A -
item Golubenko, Z -
item Veshkurova, O -
item Rakhimov, T -
item Amanturdiev, I -

Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract Only
Publication Acceptance Date: November 3, 2011
Publication Date: January 4, 2012
Citation: Namazov, S., Bell, A.A., Stipanovic, R.D., Marupov, A., Golubenko, Z., Veshkurova, O., Rakhimov, T., Amanturdiev, I. 2012. Disease resistance of cotton hybrids with different level of total and different ratios of (+)- to (-)-gossypol in seeds [Abstract]. Proceedings of the Beltwide Cotton Conferences, January 3-6, 2012, Orlando, Florida. p. 12823.

Technical Abstract: The presence of gossypol in glands of cotton helps protect the plant from pests. However, there is very limited information on how the ratio of (+)- and (-)-gossypol enantiomers affects resistance to insects and pathogens. We are interested in developing cotton plants that produce seed with a low level of (-)-gossypol in the seed, since it may be possible to feed this seed to non-ruminant animals. To understand how the level of total gossypol, and the (+)- to (-)-gossypol ratio in flower petals and seeds influence resistance to insects and pathogens we initiated greenhouse and field studies in which we compared commercial Uzbek varieties with new cotton lines derived from crosses with lines exhibiting the high (+)-gossypol seed trait. Thus, different cotton varieties and progenies were evaluated for resistance to insects (Helicoverpa armigera, and Tetranychus urtical) and to the major pathogens affecting cotton production in Uzbekistan including Verticillium dahliae, Thelaviopsis bazicola and Rhizoctonia solani. Results from our research showed that the level of (+)-gossypol in flower petals and seeds does not affect resistance to these insects and pathogens. Thus, it should be possible to develop breeding material with good resistance to insects and diseases, but that also exhibit the high ratio of (+)- to (-)-gossypol in seeds.

Last Modified: 10/1/2014