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RISS 인기검색어
- 검색키워드
- 저자 : Amegbor, Koffi (검색결과 4 건)
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Amegbor Isaac Kodzo,Abe Ayodeji,Adjebeng-Danquah Joseph,Adu Gloria Baokyewaa,Oteng-Frimpong Richard 한국작물학회 2022 Journal of crop science and biotechnology Vol.25 No.2
Breeding for drought tolerance and increased grain yield is vital in mitigating the threat posed by recurrent drought stress on maize production, as well as tackling malnutrition with plant-based food products. The study was conducted to assess the combining ability of yellow maize lines and the performance of their single-cross hybrids under drought and rain-fed conditions. A total of 24 yellow maize inbred lines from CSIR-Savanna Agricultural Research Institute Maize Improvement Programme gene pool were selected and inter-mated using North Carolina II mating design to generate 96 single-cross hybrids. The 96 hybrids together with four advanced hybrids used as checks (a total of 100 hybrids) were evaluated under drought and rain-fed conditions for two years using a 10×10 lattice design with two replications. The hybrids difered signifcantly in their grain yield (GY) and agronomic performance under the growing conditions. In the present study, drought stress reduced GY by 50.3%. The general combining ability (GCA) and specifc combining ability (SCA) for GY and its related traits were signifcant. Even though additive and non-additive gene actions controlled the inheritance of the traits, additive gene action was found to be more important than non-additive genetic efects. Hybrids 27, 81 and 68 on the other hand 89, 18 and 26 were identifed as the outstanding genotypes under drought and rain-fed conditions, respectively. These hybrids should be extensively evaluated under varied conditions and commercialized to enhance food insecurity in sub-Saharan Africa.
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Emmanuel Yaw Owusu,Isaac Kodzo Amegbor,Haruna Mohammed,Francis Kusi,Ibrahim Atopkle,Emmanuel Kofi Sie,Memunatu Ishahku,Muktaru Zakaria,Sumani Iddrisu,Haruna Ali Kendey,Ousmane Boukar,Christian Fatokun 한국작물학회 2020 Journal of crop science and biotechnology Vol.23 No.5
The variable cowpea productivity across diff erent environments demands evaluating the performance of genotypes in a breeding program prior to their release. The aim of this study was to assess yield stability of eight cowpea advanced breeding lines selected from participatory varietal selection in multilocational trials, and to identify mega-environments for cowpea production in Ghana. The genotypes were evaluated across fi ve environments in 2016 and 2017 in randomized complete block design with three replications. The GEA-R version 4.0 software was used for genotype main eff ect plus genotype by environment interaction (GGE) biplot analyses. Analysis of variance (PROC GLM of SAS using a RANDOM statement with the TEST option) detected signifi cant variations for location, year, genotype, environment, and their interactions. The results showed that the yield performances of the cowpea genotypes were highly infl uenced by genotype × environment interaction eff ects. The principal component 1 (PC1) and PC2 were signifi cant components which accounted for 46.75% and 22.84% of GGE sum of squares, respectively. We showed for the fi rst time, two mega-environments for cowpea production and testing in the major cowpea production agro-ecologies in Ghana. The genotypes SARI-6-2-6 and IT07K-303-1 were adapted to Damongo, Nyankpala, and Tumu, whereas SARI-2-50-80 was adapted to Yendi and Manga. The best ranking location was Damongo followed by Tumu, and Nyankpala. The high-yielding genotypes, IT86D-610, IT10K-837-1, IT07K-303-1, and SARI-2-50-80 had signifi cant higher grain yields than the check (Bawutawuta) and were recommended for release as cultivars (or as breeding lines) to boost cowpea production in Ghana.
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Descriptive Epidemiology of Thyroid Cancers in Togo
Darre, Tchin,Amana, Bathokedeou,Pegbessou, Essobozou,Bissa, Harefeteguena,Amegbor, Koffi,Boko, Essohanam,Kpemessi, Eyawelohn,Napo-Koura, Gado Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.15
Background: The purpose of this study was to provide epidemiological and histological data of thyroid cancers in Togo. Materials and Methods: This was a retrospective cross-sectional study of cases of thyroid cancers diagnosed from 2000 to 2014 (15 years) at the pathology laboratory of the Sylvanus Olympio Teaching Hospital of $Lom{\acute{e}}$. All cases of review of a thyroid sample (biopsies, surgical specimens) were collected from the data records of that laboratory. Results: Thyroid cancers represented 1.1% (7930cases) of all cancers registered during the study period. Mean age was $45.4{\pm}0.3$ years and the proportion of females was 78.3%. We identified 92.4% carcinomas and 7.6% lymphomas. Carcinomas were well differentiated in 80 cases and were dominated by the papillary type (47 cases). Metastasis was observed in 13% of patients. The pTNM classification evaluated in 18 cases showed a predominance of grade I (13 cases). Lymphomas were dominated by lymphoma diffuse large B-cell (5 cases). Conclusions: This study is the first global standard for thyroid cancer pathology in Togo. The high frequency of follicular form suggests an unrecognized iodine deficiency. The improvement of the technical platform of the LAP (immunohistochemistry) will increase the diagnosis of rare forms of thyroid cancer.
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Evaluation of the Histo-Epidemiological Profile of Solid Childhood Cancers in Togo
Darre, Tchin,Maneh, Nidain,Kpatcha, Matchonna,Boume, Azanledji,Padaro, Essohana,Amegbor, Koffi,Napo-Koura, Gado Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.1
Background: Cancer is a subject of continuing concern, more common in adults than in children, but often with a poor outcome in the latter. Our study set itself the objective to describe the epidemiological and histological aspects of solid cancers in children in Togo. Materials and Methods: This descriptive, cross-sectional study focused on cases of solid cancers in children diagnosed from 2010 to 2014 (5 years) at the pathology laboratory of the Tokoin teaching hospital. Data were collected from the records of that laboratory. Results: We collected 66 cases of childhood cancer representing 5% of all solid cancers. The annual incidence was 13.2 cases. The sex ratio (M/F) was 1.4; mean age was of $7.2{\pm}1.6years$. The age group most affected was that of 5-9 years (40.9%). Four histological groups of solid childhood cancers were listed: lymphoma (n=34 cases; 51.5%), embryonic cancer (n=17 cases; 25.8%), sarcomas (n=13 cases; 19.7%) and carcinoma (n=2 cases; 3%). The most common histological types were Burkitt lymphoma (36.4%), nephroblastoma (10.6%) and retinoblastoma (10.6%). Conclusions: This study shows that solid cancers in children are relatively frequent in Togo with a male predominance. They are still largely dominated by Burkitt lymphoma, followed by retinoblastoma and nephroblastoma.
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