Genotypic variability in adaptation responses of selected clones of cassava to drought stress in the Sudan savanna zone of Nigeria
Identification of drought-tolerant and -resistant varieties of cassava is of paramount importance for the maximization of productivity potential in drought-prone areas. Nine improved cassava varieties developed in humid and subhumid agro-ecologies were evaluated for their growth responses and adapta...
| Autores principales: | , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Wiley
2003
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/96323 |
| _version_ | 1855533704280014848 |
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| author | Okogbenin, Emmanuel Ekanayake, I.J. Porto, M.C.M. |
| author_browse | Ekanayake, I.J. Okogbenin, Emmanuel Porto, M.C.M. |
| author_facet | Okogbenin, Emmanuel Ekanayake, I.J. Porto, M.C.M. |
| author_sort | Okogbenin, Emmanuel |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Identification of drought-tolerant and -resistant varieties of cassava is of paramount importance for the maximization of productivity potential in drought-prone areas. Nine improved cassava varieties developed in humid and subhumid agro-ecologies were evaluated for their growth responses and adaptability in the dry savannas of Nigeria. Field trials were set up in two cropping seasons at three different locations. Parameters evaluated included fresh root yield (FRY), fresh shoot yield (FSY), cumulative leaves formed (CLF), cumulative leaf scars (CLS), root dry-matter content (DMC), harvest index (HI), and root cyanogenic potential (CNp). Results demonstrated that varietal response differed with water table site, implying different adaptation responses of varieties to the water regime. Variations in all characters studied were significantly (P<0.05) influenced by genotype, suggesting a strong genetic basis for the phenotypic differences amongst varieties. Compared with variation attributable to location, the genotypic components were strong for FRY, FSY, CLF, CLS, HI and DMC. HI and DMC were not significantly affected by location. CNp tended to increase with increasing drought stress. The significance of genotype × environment effects for FRY suggested that genotypes may be selected for specific adaptation for drought-prone environments. The poor adaptability responses of the majority of the varieties implied that an agro-ecologically targeted breeding scheme for the dry savanna would be a more appropriate approach for the development of drought-tolerant varieties. |
| format | Journal Article |
| id | CGSpace96323 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2003 |
| publishDateRange | 2003 |
| publishDateSort | 2003 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | CGSpace963232024-11-15T08:52:53Z Genotypic variability in adaptation responses of selected clones of cassava to drought stress in the Sudan savanna zone of Nigeria Okogbenin, Emmanuel Ekanayake, I.J. Porto, M.C.M. drought stress growth manihot esculenta crantz sudan savanna water table Identification of drought-tolerant and -resistant varieties of cassava is of paramount importance for the maximization of productivity potential in drought-prone areas. Nine improved cassava varieties developed in humid and subhumid agro-ecologies were evaluated for their growth responses and adaptability in the dry savannas of Nigeria. Field trials were set up in two cropping seasons at three different locations. Parameters evaluated included fresh root yield (FRY), fresh shoot yield (FSY), cumulative leaves formed (CLF), cumulative leaf scars (CLS), root dry-matter content (DMC), harvest index (HI), and root cyanogenic potential (CNp). Results demonstrated that varietal response differed with water table site, implying different adaptation responses of varieties to the water regime. Variations in all characters studied were significantly (P<0.05) influenced by genotype, suggesting a strong genetic basis for the phenotypic differences amongst varieties. Compared with variation attributable to location, the genotypic components were strong for FRY, FSY, CLF, CLS, HI and DMC. HI and DMC were not significantly affected by location. CNp tended to increase with increasing drought stress. The significance of genotype × environment effects for FRY suggested that genotypes may be selected for specific adaptation for drought-prone environments. The poor adaptability responses of the majority of the varieties implied that an agro-ecologically targeted breeding scheme for the dry savanna would be a more appropriate approach for the development of drought-tolerant varieties. 2003-12 2018-08-09T06:40:26Z 2018-08-09T06:40:26Z Journal Article https://hdl.handle.net/10568/96323 en Limited Access Wiley Okogbenin, E., Ekanayake, I.J. & Porto, M.C.M. (2003). Genotypic variability in adaptation responses of selected clones of cassava to drought stress in the Sudan savanna zone of Nigeria. Journal of Agronomy and Crop Science, 189(6), 376-389. |
| spellingShingle | drought stress growth manihot esculenta crantz sudan savanna water table Okogbenin, Emmanuel Ekanayake, I.J. Porto, M.C.M. Genotypic variability in adaptation responses of selected clones of cassava to drought stress in the Sudan savanna zone of Nigeria |
| title | Genotypic variability in adaptation responses of selected clones of cassava to drought stress in the Sudan savanna zone of Nigeria |
| title_full | Genotypic variability in adaptation responses of selected clones of cassava to drought stress in the Sudan savanna zone of Nigeria |
| title_fullStr | Genotypic variability in adaptation responses of selected clones of cassava to drought stress in the Sudan savanna zone of Nigeria |
| title_full_unstemmed | Genotypic variability in adaptation responses of selected clones of cassava to drought stress in the Sudan savanna zone of Nigeria |
| title_short | Genotypic variability in adaptation responses of selected clones of cassava to drought stress in the Sudan savanna zone of Nigeria |
| title_sort | genotypic variability in adaptation responses of selected clones of cassava to drought stress in the sudan savanna zone of nigeria |
| topic | drought stress growth manihot esculenta crantz sudan savanna water table |
| url | https://hdl.handle.net/10568/96323 |
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