Evaluation of Post Flowering Drought Resistance (Stay-Green) Property of Ethiopian Sorghum Accessions Collected from the Drought Prone Northern Part of Ethiopia
| dc.contributor.advisor | Feten, Maseresha (Professor) | |
| dc.contributor.author | Mengiste, Zelalem | |
| dc.date.accessioned | 2019-12-12T13:20:29Z | |
| dc.date.accessioned | 2023-11-08T16:33:48Z | |
| dc.date.available | 2019-12-12T13:20:29Z | |
| dc.date.available | 2023-11-08T16:33:48Z | |
| dc.date.issued | 2008-06-05 | |
| dc.description.abstract | Drought is the major constraint limiting production of crops especially in the SubSaharan Africa. Therefore, developing crops that have the mechanism to cope with such a drought prone production environments is vital. Sorghum is known for its post-flowering drought resistance ability termed as ‘stay-green’ which enables the crop to maintain photosynthetically active green leaves under progressively depleting soil moisture. In the present study, 165 sorghum landraces, which were collected from drought prone areas of Central Tigray, South Tigray, North Wello and South Wello, were evaluated for the staygreen property. The planting time was adjusted so that the plants could be exposed to post-flowering drought stress. Augmented experimental design with 5 blocks was used. Based on visual rating, 56 accessions were selected and further data was recorded on them. Twelve accessions were identified that scored within the top 20 in at least three of the four traits which are positively correlated (relative water content, chlorophyll content, proportion of green leaves remaining 30 days after flowering, green leaf area at flowering). Most of the accessions in this grouping had higher proportion of green leaves remaining 15 days after flowering and nitrogen content at anthesis. Nineteen accessions, in addition to showing these traits also had higher extent of tillering, indicating the potential for dual purpose sorghum. The cluster analysis grouped the accessions into four clusters. Based on the cluster mean, Cluster 4 and Cluster 2 showed superiority in most of the traits. Members of Cluster 1 had higher proportion of green leaves remaining 30 days after flowering and the least proportion of green leaves remaining 15 days after flowering; indicating that the accessions included in this cluster showed better performance through a mechanism of slower rate of senescence or type B stay-green viii rather than delayed on set of senescence. The cluster groups showed a clear pattern of association according to their collection area; however, there were two distinct clusters (Cluster 3 and Cluster 4). The present result proposed 56 candidate stay-green sorghum accessions. The result also showed that these candidate materials differ in the mechanism by which they attained the stay-green syndrome, indicating the possibility of generating stay-green materials that would be different genetically and in their physiological responses as well. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/123456789/20351 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Drought | en_US |
| dc.subject | Drought Resistance | en_US |
| dc.subject | Post-Flowering | en_US |
| dc.subject | Sorghum | en_US |
| dc.subject | Stay-Green | en_US |
| dc.title | Evaluation of Post Flowering Drought Resistance (Stay-Green) Property of Ethiopian Sorghum Accessions Collected from the Drought Prone Northern Part of Ethiopia | en_US |
| dc.type | Thesis | en_US |