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Gossypol

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Introgression --- Gossypium hirsutum --- Glande a gossypol

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The principal objective of this study was to select genotypes of G. hirsutum genetically balanced and expressing the "inhibition of gossypol synthesis only in the seeds" trait introgressed from the wild species G. sturtianum. Several recurrent backcrossing and selfing were realised on the trispecific hybrid HRS (G. hirsutum x G. raimondii x G. sturtianum) BC2S2 and BC3 progenies. The application of a pressure of selection based on the evaluation of the external gossypol glands density and/or the content of gossypol in seeds in each generation of selfing and backcrossing of the descent of the trispecific hybrid allowed to isolate fertile tetraploid cotton plants producing regularly completely "glandless" seeds or seeds with very low gossypol glands density. The genes responsible of the "inhibition of the synthesis of the gossypol only in the seed" trait coming from G. sturtianum expressed them selves in the presence of the two major genes Gl2 and Gl3 of G. hirsutum. The use of mapped microsatellites markers uniformly distributed on the 26 linkage groups of the G. hirsutum genetic map permitted to monitor the introgression of chromosomal segments of G. sturtianum and G. raimondii and the evaluation of their degree of conservation in the selected progenies of the HRS hybrid. The achievement of QTL (Quantitative Trait Loci) analysis according to different methods (single marker analysis, ANOVA, 1000 replication test) allowed the identification of six SSR markers significantly linked to the expresssion of the researched trait and to map, for the first time, QTLs involved in the expression of the trait "inhibition of the gossypol synthesis only in the seed". From the investigation we carried out it appears that the genetic determinism of this trait is polygenic and that at least four chromosomal segments are involved in its expression. The plants selected in this work constitute valuable genetic stocks for the introgression of interesting agronomic traits from the wild parental species of HRS into G. hirsutum.

Gossypium --- Gossypium --- Gossypol --- Gossypol --- Selection. --- Selection --- genetic markers --- genetic markers --- genetic code --- genetic code

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Animal feed --- Chickens --- Diet --- Gossypol --- Cottonseed oil --- metabolism --- physiology --- toxicity

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Vruchtbaarheid (Menselijke). Stoornissen. --- Anticonceptionele middelen (Orale) / voor de man. --- Fertilité humaine (Hommes). Troubles. --- Contraceptifs oraux masculins. --- Gossypol. Effets physiologiques. --- Gossypol. Fysiologisch effect.