University of Khartoum

Diversity and Cross Infestation AbilitiesAmong Different Striga hermonthica (Del.)Benth, Populations in the Sudan

Diversity and Cross Infestation AbilitiesAmong Different Striga hermonthica (Del.)Benth, Populations in the Sudan

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dc.contributor.advisor Abdelgabar T. Babiker en_US
dc.contributor.author Ali, Rasha Ali Mohammed Ahmed
dc.date.accessioned 2015-06-17T12:29:27Z
dc.date.available 2015-06-17T12:29:27Z
dc.date.issued 2015-06-17
dc.date.submitted 2008
dc.identifier.uri http://khartoumspace.uofk.edu/handle/123456789/13668
dc.description.abstract Study was conducted to investigate the physiological, histological and genetic variability within Striga hermonthica populations collected from under sorghum, millet and maize. In this study physiological variability within populations was based on response of seeds to root exudates of sorghum, millet and maize and on induction of haustoria and sustainable development of Striga on the three crops. The study showed that differences in response to different host root exudates in the first two stages, germination and haustorium initiation, are non specific phases in Striga life cycle and do not indicate diversity or account for the observed intercrop specificity within S. hermonthica populations. However, the results indicated that the highest attachment and penetration attained by each of the S. hermonthica population were on their respective hosts. Penetration of S. hermonthica sorghum population to sorghum, millet and maize were 33-35%, 0-2% and 20-24%, respectively. The respective penetration of Striga maize population was 27-31%, 0-2% and 27-33%. Whereas penetration of millet population on the same crops was 22-24%, 37-43% and 9-12%, respectively. Histological aspects of attached parasite to host root were further investigated. Suberization at the cell wall was observed in the millet cultivars challenged with Striga collected from under sorghum and maize. Suberization curtailed parasite penetration and connection to the host vascular system. The Amplified Fragment Length Polymorphism (AFLP) technique was used to assess genetic diversity between three S. hermonthica populations. A UPGMA cluster analysis revealed two distinct clusters of S. hermonthica populations. Genetic distances for S. hermonthica populations ranged from 0.03 to 0.09 (0.03 between maize and sorghum strain, 0.05 between maize and millet strains and 0.09 between sorghum and millet strains). AFLP marker with three primer pairs confirmed the close relation between sorghum and maize strain. The millet strain slightly differed and was more specific to its host en_US
dc.language.iso en_US en_US
dc.publisher UOFK en_US
dc.subject Diversity,Infestation Abilitie,Different Striga hermonthic, Populations , Sudan en_US
dc.title Diversity and Cross Infestation AbilitiesAmong Different Striga hermonthica (Del.)Benth, Populations in the Sudan en_US
dc.type Thesis en_US
dc.Degree M.Sc en_US
dc.Faculty Faculty of Science en_US

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