Evaluation Of Cassava Genotypes For Resistance To Cassava Brown Streak Disease (Cbsd) In Uganda
| dc.contributor.author | Abaca, Alex | |
| dc.date.accessioned | 2022-12-06T14:18:44Z | |
| dc.date.available | 2022-12-06T14:18:44Z | |
| dc.date.issued | 2013 | |
| dc.description.abstract | Cassava (Manihot esculenta Cranz) production in Uganda is being constrained by the devastating effects of cassava brown streak disease (CBSD). CBSD is caused by cassava brown streak virus (CBSV), which affects all parts of the cassava plant, causing characteristic above and below ground symptoms. The economically damaging symptoms occur on the roots as a yellow/brown-corky necrosis. In terms of control, the most economically viable method for CBSD management is the use of host-plant resistance. This implies that development of cassava varieties that are resistant to CBSD is an important component in the CBSD management. Thus, the specific objectives of this study were to: (i) evaluate local and elite cassava genotypes for resistance to cassava brown streak disease, (ii) assess the genetic relatedness of these selected cassava genotypes using the simple sequence repeat (SSR) markers and (iii) quantify CBSD root symptom development stages among selected cassava varieties. To achieve this, 116 local and elite cassava genotypes were evaluated at Namulonge, a hotspot for CBSD. Foliar data were collected at monthly interval for a period of 12 months and root data was collected at harvest. Fresh leaves were collected and DNA was extracted from these genotypes and assayed with 30 SSRs, using the ABI 3730 DNA sequencer (Applied Biosystems). Nine other cassava genotypes classified as 5 tolerant and 4 susceptible were also tested at NaCRRI in a factorial split plot design for the determination of root necrosis development critical stages. Foliar and root CBSD incidence and severity were collected starting at 4 MAP for root necrosis progression up to 12 | en_US |
| dc.identifier.citation | Abaca, A. (2013). Evaluation of cassava genotypes for resistance to cassava brown streak disease (cbsd) in Uganda (Doctoral dissertation, Makerere University). | en_US |
| dc.identifier.uri | https://nru.uncst.go.ug/handle/123456789/6005 | |
| dc.publisher | Makerere University | en_US |
| dc.subject | Cassava | en_US |
| dc.subject | Uganda | en_US |
| dc.subject | streak disease | en_US |
| dc.title | Evaluation Of Cassava Genotypes For Resistance To Cassava Brown Streak Disease (Cbsd) In Uganda | en_US |
| dc.type | Article | en_US |