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Her honor : my life on the bench ... what works^ what's broken^ and how to change it
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"미국의 ""뒷문봉쇠""(Backdoor Containment) 정책^ 1947~1950"
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환경과 콘크리트
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Electromagnetic Design of a Novel Linear Maglev Transportation Platform With Finite-Element Analysis
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- 저자 : Manu-Aduening, Joseph Akwasi (검색결과 4 건)
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Manu-Aduening, Joseph Akwasi,Peprah, Bright Boakye,Agyeman, Adelaide 한국작물학회 2013 Journal of crop science and biotechnology Vol.16 No.1
Availability of genetic diversity is important in selecting suitable cultivars for crop improvement. Progenies of crosses between 19 farmer-preferred cassava landraces and Cassava Mosaic Disease (CMD)-resistant cultivar TME 11 were evaluated and compared with their maternal parents to assess their genetic variability and genetic gains based on CMD tolerance, some growth variables and root yield. The combined analysis of variance for the traits showed significant genotypic differences amongst the progenies and the parents. Apart from a few instances, the differences in replications and years were also significant. Genetic variability components showed high heritability ranging from 92.3 to 99.6% and moderately high genetic gains of 54.1 to 99.6% for the parental cultivars. Apart from canopy spread and plant height, heritability and genetic gains of the progenies were slightly lower than the parents indicating high variability within families of the progenies. The phenotypic coefficient of variation was slightly greater than genotypic coefficient of variation indicating minimal influence of environment on the genotypes. For most of the characters evaluated, the mean performance of the progenies was higher than their corresponding parental lines. Although the genotypes differed significantly (P < 0.001) for all traits evaluated, cultivars such as Afebankye, Bosome nsia, Cedi bankye, 262 Debor, Kwadaso 25, Nkaakom 57 and Sisipe were found to constitute a pool of germplasm with adequate variability. The negative correlation between CMD incidence and other traits evaluated showed significant progress made in the breeding program.
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Joseph Akwasi Manu-Aduening,Bright Boakye Peprah,Adelaide Agyeman 한국작물학회 2013 Journal of crop science and biotechnology Vol.16 No.1
Availability of genetic diversity is important in selecting suitable cultivars for crop improvement. Progenies of crosses between 19farmer-preferred cassava landraces and Cassava Mosaic Disease (CMD)-resistant cultivar TME 11 were evaluated and compared with their maternal parents to assess their genetic variability and genetic gains based on CMD tolerance, some growth variables and root yield. The combined analysis of variance for the traits showed significant genotypic differences amongst the progenies and the parents. Apart from a few instances, the differences in replications and years were also significant. Genetic variability components showed high heritability ranging from 92.3 to 99.6% and moderately high genetic gains of 54.1 to 99.6% for the parental cultivars. Apart from canopy spread and plant height, heritability and genetic gains of the progenies were slightly lower than the parents indicating high variability within families of the progenies. The phenotypic coefficient of variation was slightly greater than genotypic coefficient of variation indicating minimal influence of environment on the genotypes. For most of the characters evaluated, the mean performance of the progenies was higher than their corresponding parental lines. Although the genotypes differed significantly (P < 0.001) for all traits evaluated, cultivars such as Afebankye, Bosome nsia, Cedi bankye, 262 Debor, Kwadaso 25, Nkaakom 57and Sisipe were found to constitute a pool of germplasm with adequate variability. The negative correlation between CMD incidence and other traits evaluated showed significant progress made in the breeding program.
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J. Adjebeng-Danquah,J. Manu-Aduening,V. E. Gracen,S. K. Offei,I. K. Asante 한국작물학회 2016 Journal of crop science and biotechnology Vol.19 No.4
This study was carried out to assess genotypic variability in abscisic acid content, carbon isotope ratio, and their relationship to storage root yield and yield components in cassava under irrigation and moisture stress. The study involved 20 cassava genotypes arranged in randomized complete block design with three replications. Irrigation water was applied using a drip irrigation system with a discharge rate of approximately 5.33 L m-2 hr-1. Significant (P < 0.05) genotypic variability was observed for all physiological, growth, and yield traits assessed. Abscisic acid content was higher under stress than irrigation and negatively correlated with root yield (r = -0.45), harvest index (r = -0.43), and above-ground biomass yield (r = -0.20) indicating that it can be used as indirect selection criteria against unproductive genotypes. Carbon isotope ratio was significantly and positively correlated with above-ground biomass yield (r = 0.20) but not root yield (r = 0.09). Estimates of genotypic variability indicated high values for most of the growth and yield components but low heritability values for abscisic acid content, carbon isotope ratio, stomatal conductance, and root yield under stress conditions. However, higher estimates were recorded under irrigation and in the combined analysis. It was also found from this study that carbon isotope ratio influences above-ground biomass but not storage root yield under stress conditions. The results from this study provide useful information on the relationship between abscisic acid content, carbon isotope discrimination, and storage root yield in field-grown cassava.
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J. Adjebeng-Danquah,V. E. Gracen,S. K. Offei,I. K. Asante,J. Manu-Aduening 한국작물학회 2016 Journal of crop science and biotechnology Vol.19 No.1
We evaluated the agronomic performance and diversity for morphological traits among a collection of local and exotic cassava genotypes in the Guinea Savannah agroecology of Ghana. One hundred and fifty cassava genotypes were assessed using 28 agro-morphological (18 qualitative and 10 quantitative) traits recorded from three months after planting until harvesting at 12 months after planting. There was significant genetic variability among the genotypes for most of the traits evaluated. High broad sense heritability was observed for most of the traits. Principal component analyses of the traits indicated that the first three principal component axes which accounted for more than 55% of the variation for 10 quantitative traits included storage root yield, number of leaves, harvest index, height at first branching, and plant height as the most important traits. A greater proportion of the phenotypic variances of plant height, height at branching, and harvest index were accounted for by genetic variances indicating that progress could made with selection. Pearson correlation analysis indicated that a number of traits were related to growth and yield of cassava in the Guinea Savanna ecology, making indirect selection for root yield possible. The study revealed ample genotypic variation in these morphological and agronomic traits to support selection for improved varieties.
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