Investigation on hybrid fitness for gene flow and germplasm conservation of cotton in the lake zone, Tanzania

dc.contributor.authorAlphonce, Esnath
dc.date.accessioned2020-04-03T10:13:26Z
dc.date.available2020-04-03T10:13:26Z
dc.date.issued2014
dc.descriptionAvailable in printed form, East Africana Collection, Dr. Wilbert Chagula Library, Class mark (THS EAF QK495M27T34A46 )en_US
dc.description.abstractTo increase cotton production, Tanzania is considering the introduction of Bt cotton, a genetically modified (GM) Gosspyium hirsutum cultivar as an intergrated pest management (IPM) strategy. GM crops pose environmental concerns warranting ecological risk assessment (ERA) be done prior to their introduction. National Biosafety regulations require ERA to be conducted prior to GM crop introduction. ERA inputs include baseline information on diversity and distribution of wild/feral relatives of cotton and reproductive mechanisms that Tanzania is presently lacking.it is revealed that G. barbadense is compatible to cultivated cotton and is widely distributed in Southern highland of Tanzania. This study aimed to investigate germplasm conservation strategy by communities; diversity and distribution of feral cotton in Lake Zone using a field survey and mapping, and establish hybrid fitness between cultivated G. hirsutum of Tanzania. This study aimed to investigate germplasm conservation strategy by communities, diversity and distribution of feral cotton in Lake Zone using a field survey and mapping, and establish hybrid fitness between cultivated G. hirsutum and feral G. barbadense through controlled hybridization to assess gene flow between the two species from parents to second filial generation (F2). The field survey, identification and clustering revealed that G. barbadense is present in the Lake Zone area. In this area, the species is used as medicine, local fibre, border and ornamental plant suggesting that the species has social-economic value to communities. Morphological markers showed variation in G. barbadense plants collected in the Lake Zone suggesting interspecific hybridization with G. Hirsutum. Simple sequence repeats (SSR) markers confirmed the occurrence of natural hybrids between the two species. The fitness of f2 hybrids was found to be near fit as their parents, suggesting that there is potential for gene flow between two species in the absence of appropriate management strategies.en_US
dc.identifier.citationAlphonce, E (2014) Investigation on hybrid fitness for gene flow and germplasm conservation of cotton in the lake zone, Tanzania.Master dissertation, University of Dar es Salaam, Dar es Salaam.en_US
dc.identifier.urihttp://41.86.178.5:8080/xmlui/handle/123456789/8852
dc.language.isoenen_US
dc.publisherUniversity of Dar es Salaamen_US
dc.subjectGossypium hirsutumen_US
dc.subjectHybridizationen_US
dc.subjectSea Island cottonen_US
dc.subjectTanzaniaen_US
dc.titleInvestigation on hybrid fitness for gene flow and germplasm conservation of cotton in the lake zone, Tanzaniaen_US
dc.typeThesisen_US
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