Please use this identifier to cite or link to this item: http://hdl.handle.net/1/3762
Title: Genetic characterisation of homoeologous recombination and chromosome inheritance in G hirsutum x K genome alien chromosome addition lines
Authors: Becerra, Augusto
Keywords: fusarium wilt
Fusarium oxysporum f. sp. vasinfectum (Fov)
fungal diseases
G. hirsutum gene pool
Genetic analysis of G. hirsutum x G. sturtianum hybrids
G. sturtianum genome
genetic understanding of Fusarium wilt resistance
Issue Date: 30-Jun-2004
Publisher: CSIRO Plant Industry
Series/Report no.: ;CSP120C
Abstract: Fusarium wilt, caused by Fusarium oxysporum f. sp. vasinfectum (Fov), is a serious disease of cotton in Australia responsible for substantial yield reductions. Since its detection on the Darling Downs in 1993, Fov has spread to all major eastern cotton growing districts except the lower Namoi. The significant crop losses that have already occurred and the increasing incidence and severity of Fusarium wilt make Fusarium wilt the most significant challenge to long term sustainable cotton production in Australia. Improved farm management strategies can reduce yield losses and disease spread, but developing resistant cultivars is by far the most effective long-term means of combating fungal diseases of agricultural plants. Australian cotton breeders have significantly improved the Fusarium wilt resistance of their cultivars, and new selections with even greater resistance are nearing commercial release. Despite the admirable progress that has been made, however, the current assessment is that new sources of Fusarium wilt resistance are needed. With the realization that the best the G. hirsutum gene pool has to offer may not be good enough, We have looked to related Australian Gossypium species for novel sources of Fusarium wilt resistance, identifying one possible source of Fusarium wilt resistance in G. sturtianum. Although some of the G. sturtianum accessions tested are susceptible to fusarium wilt, many of the accessions are more resistant to fusarium wilt than the industry standards, and this resistance is expressed in the G. hirsutum background. Genetic analysis of G. hirsutum x G. sturtianum hybrids, however, suggests transferring the G. sturtianum genes to G. hirsutum will be difficult. Nonetheless, breeding lines are currently in the Fusarium field nurseries and this selection process will continue. The other important outcome of this project was the development of new experimental populations and molecular markers that will, in ongoing research, provide a much better understanding the genetic control of fusarium wilt resistance in cotton. Under this grant, five chromosomes of the G. sturtianum genome have been identified as carrying genes that may contribute fusarium wilt resistance. The experimental populations and molecular markers will contribute to a more explicit genetic understanding of Fusarium wilt resistance that will facilitate our ability to effectively transfer genes from G. sturtianum as well as other novel resistance sources. With the apparent lack of immunity in the G. hirsutum gene pool, these novel germplasm resources will become increasingly important to cotton breeders.
URI: http://hdl.handle.net/1/3762
Appears in Collections:2004 Final Reports

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