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Dissertations / Theses on the topic 'African cassava mosaic'

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Published: 4 June 2021
Last updated: 17 February 2022

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1

Naseem, Saadia [Verfasser]. "Molecular studies on the interactions between African cassava mosaic virus (ACMV) and East African cassava mosaic virus (EACMV-UG) infecting cassava (Manihot esculenta Crantz) / Saadia Naseem." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover, 2011. http://d-nb.info/1012624684/34.

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2

Ndunguru, Joseph. "Molecular characterization of cassava mosaic geminiviruses in Tanzania." Thesis, University of Pretoria, 2005. http://hdl.handle.net/2263/30648.

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Cassava (Manihot esculenta Crantz) is a basic staple food crop in Tanzania. Cassava mosaic disease (CMD) caused by cassava mosaic geminiviruses (CMGs) constitutes a major limiting factor to cassava production in the country. This study was undertaken to characterize the CMGs occurring in Tanzania using molecular techniques and to map their geographical distribution to generate information on which the formulation of control measures can be based. Using Polymerase Chain Reaction (PCR) and Restriction Fragment Length Polymorphism (RFLP) for analysis of CMGs DNA-A genomes, different CMGs were fou
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3

Ward, Andrew. "Studies on transcription and gene expression in African cassava mosaic virus." Thesis, University of East Anglia, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329413.

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4

Otim-Nape, George William. "Epidemiology of the African cassava mosaic geminivirus disease (ACMD) in Uganda." Thesis, University of Reading, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357982.

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5

Haley, Ann. "Characterisation of the movement proteins of two plant viruses." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308317.

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6

Frey, Petra Maria. "A study of African cassava mosaic virus gene expression for the development of virus resistance /." [S.l.] : [s.n.], 2000. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13557.

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7

Moralo, Maabo. "Evaluation of transgenic cassava expressing mismatch and non-mismatch hpRNA constructs derived from African cassava mosaic virus and South African cassava mosaic virus open reading frames." Thesis, 2015. http://hdl.handle.net/10539/19289.

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A thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Doctor of Philosophy in the School of Molecular and Cell Biology. Johannesburg, 2015.<br>With rising global food prices, growing populations, climate change and future demand for tuber crops for feed and potential energy source, cassava is well positioned to meet the needs of many countries in the SADC region, including South Africa. However a major constraint to cassava cultivation is cassava infecting begomoviruses (CBVs), including African cassava
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8

Mabeer, Pravir. "Evaluation of tubers from cassava transgenic lines tolerant to African cassava mosaic virus." Thesis, 2020. https://hdl.handle.net/10539/31051.

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Dissertation submitted in fulfilment of the requirements for the degree Master of Science in Molecular and Cell Biology in the Faculty of Science, University of the Witwatersrand, 2020<br>Cassava (Manihot esculenta Crantz) is a crop plant that produces starchy tuberous roots. The cassava plant is resilient to abiotic stress and very efficient at producing carbohydrates, making it a valuable crop in the production of starch, for industrial uses. Some of the main causes of yield loss in cassava plants are viral diseases, such as cassava mosaic diseases (CMD), caused by
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9

Pierce, Erica Joanna. "Transcriptome profiling in susceptible model and natural host systems in response to South African cassava mosaic virus." Thesis, 2014.

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Geminiviruses causes diseases to many staple food and cash crops of great economic importance worldwide. Currently eight species of Begomoviruses belonging to the Geminivirus family exist, of which South African cassava mosaic virus SACMV-[ZA:99] is a member, and is known to cause cassava mosaic disease (CMD). Cassava (Manihot esculenta, Crantz) is considered to be an important food crop consumed in many tropical, sub-tropical and African countries, and is increasingly becoming well-known for its ethanol production on a global a scale. Various strategies to control CMD are currently being impl
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10

Abraham, Natasha. "Characterisation of a subgenomic molecule associated with South African cassava mosaic virus." Thesis, 2013. http://hdl.handle.net/10539/12365.

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Cassava (Manihot esculenta) is a major food crop in sub-Saharan Africa, where cassava is mostly used as a subsistence crop. In southern Africa, cassava production is affected by cassava mosaic disease (CMD). The impact of CMD on cassava yield has a devastating impact on the economy in southern Africa as it is also an important industrial crop. South African cassava mosaic virus (SACMV) is a distinct geminivirus known to cause CMD in Southern Africa. SACMV is a bipartite virus where the two components DNA-A (2800bp) and DNA-B (2760bp) code for important proteins needed for viral replicati
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11

Harmse, Johan. "Engineering virus resistant transgenic cassava: the design of long hairpin RNA constructs against South African cassava mosaic virus." Thesis, 2008. http://hdl.handle.net/10539/4685.

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ABSTRACT Cassava is currently the second most important source of carbohydrates on the African continent. In the last two decades, cassava crops have been severely affected by outbreaks of cassava mosaic disease (CMD). South African cassava mosaic virus (SACMV) has been associated with CMD outbreaks in the Mpumalanga province. Advances in post-transcriptional gene silencing (PTGS) technology have provided promising new strategies for the engineering of virus resistance in plants. Inverted repeat (IR) constructs are currently the most potent inducers of PTGS, however, these constructs a
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12

Allie, Farhahna. "Gene expression studies towards the elucidation of host responses to South African cassava mosaic virus." Thesis, 2014.

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A thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Doctor of Philosophy. Johannesburg, 2013.<br>Unable to load abstract.
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13

Pierce, Erica Joanna. "Gene expression studies in Arabidopsis in response to South African Cassava Mosaic Virus infection utilizing microarrays." Thesis, 2006. http://hdl.handle.net/10539/1813.

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Student Number : 9610284H - MSc dissertation - School of Molecular and Cell Biology - Faculty of Science<br>Cassava Mosaic Disease is the most devastating disease affecting cassava (Manihot esculenta Crantz) crops worldwide. This disease is associated with eight species of geminiviruses, all belonging to the genus Begomovirus of the family Geminiviridae. In South Africa, in particular, CMD is caused by South African cassava mosaic virus (SACMV). Currently, there are no adequate methods for control of this disease as mechanisms within virus-host interactions are poorly understood. This b
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14

Mvududu, DonTafadzwa Kudzanai. "Screening of cassava improved germplasm for potential resistance against cassava mosaic disease." Thesis, 2017. http://hdl.handle.net/10539/22733.

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A dissertation submitted to the Faculty of Science, University of the Witwatersrand, in fulfillment of the requirements for the degree of Master of Science in the School of Molecular and Cell Biology. Johannesburg 2017<br>With growing populations and climate change associated drought predicted for the future, cassava can provide one solution for food security and a source of starch for industrial use and biofuels in South Africa, and other countries in the SADC region. One of the severe constraints on cassava production is cassava mosaic disease (CMD) caused by cassava infecting begomovirus
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15

Rajabu, Cyprian Aloyce. "Development and evaluation of efficient diagnostic tools for Cassava mosaic and Cassava brown streak diseases." Thesis, 2014.

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Cassava (Manihot esculenta Crantz) is affected by two major viral diseases, namely Cassava brown streak disease (CBSD) and Cassava mosaic disease (CMD). Accurate and efficient detection and identification of plant viruses are fundamental aspects of virus diagnosis leading to sustainable disease management. In the present study I describe two techniques, the first based on a single tube duplex and multiplex polymerase chain reaction (m-PCR), developed for simultaneous detection of African cassava mosaic virus (ACMV), East African cassava mosaic Cameroon virus (EACMCV) and East African cassava m
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16

Mabasa, Kenneth Gaza. "Epidemiology of Cassava mosaic disease and molecular characterization of Cassava mosaic viruses and their associated whitefly (Bemisia Tabaci) vector in South Africa." Thesis, 2008. http://hdl.handle.net/10539/4966.

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Cassava mosaic disease (CMD) is caused by whitefly-transmitted geminiviruses and is a major constraint to cassava production in Africa. Field surveys were conducted in three (Bushbuckridge, Mariti and Tonga) cassava growing areas of Limpopo and Mpumalanga provinces in South Africa during two seasons (2004/2005 and 2005/2006). Results showed that a higher percentage (27.1%) of CMD infection was due to the use of infected planting materials compared to whitefly borne-infections (10.4%). Disease symptoms were generally mild. There was no change in disease incidence over the survey period.
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17

Rogans, Sarah Jane. "The role of small RNAs in susceptibility and tolerance to cassava mosaic disease." Thesis, 2016. http://hdl.handle.net/10539/21701.

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A dissertation presented by Sarah Jane Rogans to The Faculty of Science, University of the Witwatersrand, Johannesburg in fulfilment of the requirements for the degree of Doctor of Philosophy in the School of Molecular and Cell Biology. 2016<br>Cassava (Manihot esculenta, Crantz) is considered to be an important food security crop consumed by over a billion peoples globally, many who subsist on it. Cassava mosaic disease (CMD) is one of the main biotic and economically important constraints to cassava cultivation in sub-Saharan Africa. Geminiviruses are the casual agents of CMD and cause dise
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18

Mugerwa, Habibu. "Molecular variability of cassava Bemisia tabaci and its effects on the spread of cassava mosaic begomoviruses in East Africa." Thesis, 2014.

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Bemisia tabaci is the vector of cassava mosaic begomoviruses and cassava brown streak viruses which are main production constraints to cassava in sub-Saharan Africa. Current vector dynamics involved in the spread of both viruses in the region was established through comparison of the mitochondria cytochrome oxidase I DNA. Two distinct species were obtained: sub-Saharan Africa clade 1 (SSA1), comprising of two sub-clades (I & II), and a South West Indian Ocean Islands (SWIO) species. SSA1 sub-clade I whiteflies were widely distributed in East Africa. SSA1 sub-clade II whiteflies predominated th
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19

Freeborough, Warren. "The transcription factor interacting network of tolerant TME3 and susceptible T200 cassava landraces infected with SACMV." Thesis, 2019. https://hdl.handle.net/10539/29438.

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A dissertation submitted to the Faculty of Science of the University of Witwatersrand, Johannesburg, in full fulfilment of the requirements for the degree of Master of Science, 2019<br>Cassava, Manihot esculenta Crantz, is categorized as a food security crop, producing large starchy tubers that are gaining interest from both international and local agro-processing industries for products such as bioethanol, textiles, and food additives. However, cassava is currently under threat from a group of begomoviruses that cause cassava mosaic disease (CMD) in all countries in sub-Saharan Africa where c
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