Genetic and Cytogenetic Studies in some Species of the Genus Crotalaria Linn.
A collection of the dominant species of Crotalaria was made from different parts of Nigeria. Eight species in all were assembled. These collections were subjected to morphological, cytological and biochemical characterizations. Intra specific and inter specific hybridizations were attempted. Conside...
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Obafemi Awolowo University
2014
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| author | Akpabio, Kingsley Essien |
| author2 | Olorode, Omotoye |
| author_facet | Olorode, Omotoye Akpabio, Kingsley Essien |
| author_sort | Akpabio, Kingsley Essien |
| collection | DSpace |
| description | A collection of the dominant species of Crotalaria was made from different parts of Nigeria. Eight species in all were assembled. These collections were subjected to morphological, cytological and biochemical characterizations. Intra specific and inter specific hybridizations were attempted. Considerable overlap in their vegetative and floral attributes was observed.
Statistical analysis of the morphological data has shown that vegetative and frutescence features of Crotalaria plants are important in sub generic and species delimitations. This analysis also shows that qualitative and quantitative characters of flowers, fruits and seeds are important in the identification of Crotalaria species.
Observations on the karyotypes and meiotic behaviour of the eight species indicate that six of the species - C. retusa, C. goreensis, C. spectabilis, C. cylindrocarpa C. calycina and C. comosa have somatic complements of sixteen chromosomes (2n=16) each, while two--C.doniana and C.naragutensis--have two accessory chromosomes in addition. The low occurrence of multivalent associations in the diakinesis of each species indicates that the homologues within each genome are considerably distinct structurally. Occurrence of giant cells with large coalesced elements suspected to represent gene amplification is also observed in three species - C. retusa, C. goreensis, and C. cylindrocarpa.
Attempt is made to speculate on the evolutionary relationships among the species studied. |
| format | Thesis |
| id | oai:ir.oauife.edu.ng:123456789-3426 |
| institution | My University |
| language | English |
| publishDate | 2014 |
| publisher | Obafemi Awolowo University |
| record_format | dspace |
| spelling | oai:ir.oauife.edu.ng:123456789-34262023-05-13T11:10:11Z Genetic and Cytogenetic Studies in some Species of the Genus Crotalaria Linn. Akpabio, Kingsley Essien Olorode, Omotoye Crotalaria plants genetics cytogenetics A collection of the dominant species of Crotalaria was made from different parts of Nigeria. Eight species in all were assembled. These collections were subjected to morphological, cytological and biochemical characterizations. Intra specific and inter specific hybridizations were attempted. Considerable overlap in their vegetative and floral attributes was observed. Statistical analysis of the morphological data has shown that vegetative and frutescence features of Crotalaria plants are important in sub generic and species delimitations. This analysis also shows that qualitative and quantitative characters of flowers, fruits and seeds are important in the identification of Crotalaria species. Observations on the karyotypes and meiotic behaviour of the eight species indicate that six of the species - C. retusa, C. goreensis, C. spectabilis, C. cylindrocarpa C. calycina and C. comosa have somatic complements of sixteen chromosomes (2n=16) each, while two--C.doniana and C.naragutensis--have two accessory chromosomes in addition. The low occurrence of multivalent associations in the diakinesis of each species indicates that the homologues within each genome are considerably distinct structurally. Occurrence of giant cells with large coalesced elements suspected to represent gene amplification is also observed in three species - C. retusa, C. goreensis, and C. cylindrocarpa. Attempt is made to speculate on the evolutionary relationships among the species studied. 2014-05-07T12:43:36Z 2018-10-29T11:06:35Z 2014-05-07T12:43:36Z 2018-10-29T11:06:35Z 1986 Thesis APA http://localhost:8080/xmlui/handle/123456789/3426 en PDF application/pdf Obafemi Awolowo University |
| spellingShingle | Crotalaria plants genetics cytogenetics Akpabio, Kingsley Essien Genetic and Cytogenetic Studies in some Species of the Genus Crotalaria Linn. |
| title | Genetic and Cytogenetic Studies in some Species of the Genus Crotalaria Linn. |
| title_full | Genetic and Cytogenetic Studies in some Species of the Genus Crotalaria Linn. |
| title_fullStr | Genetic and Cytogenetic Studies in some Species of the Genus Crotalaria Linn. |
| title_full_unstemmed | Genetic and Cytogenetic Studies in some Species of the Genus Crotalaria Linn. |
| title_short | Genetic and Cytogenetic Studies in some Species of the Genus Crotalaria Linn. |
| title_sort | genetic and cytogenetic studies in some species of the genus crotalaria linn |
| topic | Crotalaria plants genetics cytogenetics |
| url | http://localhost:8080/xmlui/handle/123456789/3426 |
| work_keys_str_mv | AT akpabiokingsleyessien geneticandcytogeneticstudiesinsomespeciesofthegenuscrotalarialinn |