Use of the wild Australian species Gossypium sturtianum J.H. Willis and Gossypium australe F. Muell. to improve Gossypium hirsutum L. | Cinq paradoxes dans la politique de l'eau
2002
Ahoton, L.E.
In order to assess the possibility to use the wild Australian species Gossypium sturtianum and Gossypium australe to improve the main cotton cultivated species, several experiments were carried out in Belgium and in Benin. Pentaploids and monosomic addition lines were produced from the hexaploids 2(Gossypium hirsutum x G. sturtianum) and 2(G. hirsutum x G. australe) to quantify genetic material exchanges occurring in these hybrid structures. This quantification was obtained through morphological and cytogenetic observations and through the use of chromosome in situ hybridization. The pollen fertility of the plant materials produced was also evaluated systematically. For the first time, the 13 monosomic addition lines of G. australe on G. hirsutum were isolated. These lines constitue valuable genetic stocks to carry out fundamental and applied investigations. The observation of the progeny of the various hybrids allowed to quantify the frequency of alien genetic material exchanges. In situ hybridization appeared to be a very efficient tool to characterise the chromosomes of different genomic origins in cotton interspecific hybrids. The plants developed in this work constitute potential parents to introgress interesting agronomic traits in cotton from G. australe, notably, the gossypol biosynthesis inhibition in the seed kernel, the production of narrow bracts, hanging bolls and extra white lint
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