Obembe Olawole - Academia.edu (original) (raw)
Papers by Obembe Olawole
Frontiers in Plant Science
Poverty, food, and nutrition insecurity in sub-Saharan Africa (SSA) have become major concerns in... more Poverty, food, and nutrition insecurity in sub-Saharan Africa (SSA) have become major concerns in recent times. The effects of climate change, drought, and unpredictable rainfall patterns threaten food production and sustainable agriculture. More so, insurgency, youth restiveness, and politico-economic instability amidst a burgeoning population requiring a sufficient and healthy diet remain front-burner issues in the region. Overdependence on only a few major staple crops is increasingly promoting the near extinction of many crops, especially orphan legumes, which possess immense potentials as protein and nutritional security crops. The major staple crops are declining in yield partly to their inability to adapt to the continuously changing climatic conditions. Remarkably, the orphan legumes are climate-smart crops with enormous agronomic features which foster sustainable livelihood. Research efforts on these crops have not attained a reasonable comparative status with most commerci...
Phenotypic characterization of plant species is the basis for selection, conservation as well as ... more Phenotypic characterization of plant species is the basis for selection, conservation as well as improvement. Moringa oleifera (Lam.) is commonly grown as multi-purpose medicinal and leafy vegetable crop in Nigeria. This study evaluated phenotypic intraspecific variations among 40 accessions of M. oleifera collected from different agro-ecological zones. A total of 30 morphometric traits involving qualitative and quantitative vegetative, floral, fruit/pod and seed traits, seed set and germination percentages were combined for the analyses. Descriptive statistics, variance analysis, correlation coefficient, principal component analysis (PCA) and cluster analysis (CA) were used to evaluate the intraspecific variability. The accessions showed marked differences in floral, fruit pod and seed characters analyzed. Accessions edN037 (71 days), osN024 (73 days), ogN028 (74 days), oyN003 (75 days) and abN059 (76 days) were identified as early maturing accessions. Correlation coefficients r ≥ ...
2019 19th International Conference on Computational Science and Its Applications (ICCSA), 2019
Data is useless if information or knowledge that can be used for further reasoning cannot be infe... more Data is useless if information or knowledge that can be used for further reasoning cannot be inferred from it. Cluster analysis, based on some criteria, shares data into important, practical or both categories (clusters) based on shared common characteristics. In research, clustering and classification have been used to analyze data, in the field of machine learning, bioinformatics, statistics, pattern recognition to mention a few. Different methods of clustering include Partitioning (K-means), Hierarchical (AGNES), Density-based (DBSCAN), Grid-based (STING), Soft clustering (FANNY), Model-based (SOM) and Ensemble clustering. Challenges and problems in clustering arise from large datasets, misinterpretation of results and efficiency/performance of clustering algorithms, which is necessary for choosing clustering algorithms. In this paper, application of data clustering was systematically discussed in view of the characteristics of the different clustering techniques that make them better suited or biased when applied to several types of data, such as uncertain data, multimedia data, graph data, biological data, stream data, text data, time series data, categorical data and big data. The suitability of the available clustering algorithms to different application areas was presented. Also investigated were some existing cluster validity methods used to evaluate the goodness of the clusters produced by the clustering algorithms.
Moringa oleifera Lam. (Moringaceae) is a multi-purpose economic plant whose commercial demand is ... more Moringa oleifera Lam. (Moringaceae) is a multi-purpose economic plant whose commercial demand is on the increase in Africa. To meet this demand, it is significant to step up collections and diversity studies adaptable to higher productivity and utilization. The present study focuses on recently collected landraces/accessions of six populations of M. oleifera from different eco-geographical locations within Nigeria. A total of 70 accessions were evaluated for genetic intraspecific diversity using 20 SSR markers. Among the 20 SSR markers screened, 10 primer pairs (forward and reverse) were selected based on clear amplification products and reproducible scorable bands. Analysis of Molecular Variance (AMOVA), Principal Coordinates Analysis (PCoA) and cluster analysis (CA) were used to evaluate the genetic intraspecific diversity. A total number of 74 alleles with a range of 4 to 15 were detected among the 70 accessions. On the average, 7.4 alleles per locus were amplified in each access...
Frontiers in Plant Science
Poverty, food, and nutrition insecurity in sub-Saharan Africa (SSA) have become major concerns in... more Poverty, food, and nutrition insecurity in sub-Saharan Africa (SSA) have become major concerns in recent times. The effects of climate change, drought, and unpredictable rainfall patterns threaten food production and sustainable agriculture. More so, insurgency, youth restiveness, and politico-economic instability amidst a burgeoning population requiring a sufficient and healthy diet remain front-burner issues in the region. Overdependence on only a few major staple crops is increasingly promoting the near extinction of many crops, especially orphan legumes, which possess immense potentials as protein and nutritional security crops. The major staple crops are declining in yield partly to their inability to adapt to the continuously changing climatic conditions. Remarkably, the orphan legumes are climate-smart crops with enormous agronomic features which foster sustainable livelihood. Research efforts on these crops have not attained a reasonable comparative status with most commerci...
Journal of Ethnopharmacology, 2013
Annals of Agricultural Sciences
African Journal of Biotechnology, 2009
Carbohydrate-binding modules have been shown to alter plant cell wall structural architecture. He... more Carbohydrate-binding modules have been shown to alter plant cell wall structural architecture. Hence, they have the potential application of being used to engineer the plant to produce tailor-made natural fibers in the cell wall. The Clostridium thermocellum xylanase, Xyn10B, contains two CBMs that belong to family 22 (CBM22). The C-terminal CBM22-2 of the glycoside hydrolase (GH) 10 had been characterized
Phenotypic characterization of plant species is the basis for selection, conservation as well as ... more Phenotypic characterization of plant species is the basis for selection, conservation as well as improvement. Moringa
oleifera (Lam.) is commonly grown as multi-purpose medicinal and leafy vegetable crop in Nigeria. This study evaluated
phenotypic intraspecific variations among 40 accessions of M. oleifera collected from different agro-ecological zones. A
total of 30 morphometric traits involving qualitative and quantitative vegetative, floral, fruit/pod and seed traits, seed set
and germination percentages were combined for the analyses. Descriptive statistics, variance analysis, correlation
coefficient, principal component analysis (PCA) and cluster analysis (CA) were used to evaluate the intraspecific
variability. The accessions showed marked differences in floral, fruit pod and seed characters analyzed. Accessions
edN037 (71 days), osN024 (73 days), ogN028 (74 days), oyN003 (75 days) and abN059 (76 days) were identified as
early maturing accessions. Correlation coefficients r ≥ 0.70 were high and significant for reproductive characters. The
PCA and CA generated similar results. The first five principal component axes explained 61.40% of the total variation
with PC1 (23.92%) and PC2 (14.19%) contributing 38.11% of the total variation. The CA showed that the degree of
intraspecific similarity was high (66.82%) based on Euclidean similarity index. Nevertheless, four clusters were formed
indicating intraspecific phenotypic dissimilarity among the 40 accessions especially with the separation of accessions
that were collected from similar environments. The phenotypic variations could be explored for utilization, conservation
and for future genetic improvement by selection of accessions with promising agronomic characters.
Moringa oleifera Lam. (Moringaceae) is a multipurpose economic plant whose commercial demand is o... more Moringa oleifera Lam. (Moringaceae) is a multipurpose economic plant whose commercial demand is on the increase in Africa. To meet this demand, it is significant to step up collections and diversity studies adaptable to higher productivity and utilization. The present study focuses on recently collected landraces/accessions of six populations of M. oleifera from different eco-geographical locations within Nigeria. A total of 70 accessions were evaluated for genetic intraspecific diversity using 20 SSR markers. Among the 20 SSR markers screened, 10 primer pairs (forward and reverse) were selected based on clear amplification products and reproducible scorable bands. Analysis of Molecular Variance (AMOVA), Principal Coordinates Analysis (PCoA) and cluster analysis (CA) were used to evaluate the genetic intraspecific diversity. A total number of 74 alleles with a range of 4 to 15 were detected among the 70 accessions. On the average, 7.4 alleles per locus were amplified in each accession. Allele frequency varied from 0.214 to 0.671 with a mean of 0.477; gene diversity from 0.487 to 0.885 with a mean of 0.669 while the average PIC value was 0.633. The observed and expected heterozygosity varied from 0.00 to 0.50 with a mean of 0.972 and from 0.00 to 0.250 with a mean of 0.567, respectively. AMOVA shows that 8 % of the genetic diversity was attributed to differences among the populations while 92 % of the variation (significant at p = 0.001) was due to differences within populations. Allelic patterns across the six populations aligned with the AMOVA result. The results of PCoA and CA identified high intraspecific similarities with few exceptions. Similarity coefficients (SC) of CA ranged from 0.53 to 1.00 and delineated the 70 accessions into seven groups. All accessions are distinguishable from each other at SC 1.00 except (soN066 and taN085) and (anN045 and anN047). The genetic relationships highlighted are significant for conservation, cultivation and genetic improvement of M. oleifera in view of the species socioeconomic relevance to the people of Nigeria and Africa in general.
Journal of Ethnopharmacology, 2013
Phenotypic characterization of plant species is the basis for selection, conservation as well as ... more Phenotypic characterization of plant species is the basis for selection, conservation as well as improvement. Moringa oleifera (Lam.) is commonly grown as multipurpose medicinal and leafy vegetable crop in Nigeria. This study evaluated phenotypic intraspecific variations among 40 accessions of M. oleifera collected from different agro-ecological zones. A total of 30 morphometric traits involving qualitative and quantitative vegetative, floral, fruit/pod and seed traits, seed set and germination percentages were combined for the analyses. Descriptive statistics, variance analysis, correlation coefficient, principal component analysis (PCA) and cluster analysis (CA) were used to evaluate the intraspecific variability. The accessions showed marked differences in floral, fruit pod and seed characters analyzed. Accessions edN037 (71 days), osN024 (73 days), ogN028 (74 days), oyN003 (75 days) and abN059 (76 days) were identified as early maturing accessions. Correlation coefficients r ≥ 0.70 were high and significant for reproductive characters. The PCA and CA generated similar results. The first five principal component axes explained 61.40% of the total variation with PC1 (23.92%) and PC2 (14.19%) contributing 38.11% of the total variation. The CA showed that the degree of intraspecific similarity was high (66.82%) based on Euclidean similarity index. Nevertheless, four clusters were formed indicating intraspecific phenotypic dissimilarity among the 40 accessions especially with the separation of accessions that were collected from similar environments. The phenotypic variations could be explored for utilization, conservation and for future genetic improvement by selection of accessions with promising agronomic characters.
Frontiers in Plant Science
Poverty, food, and nutrition insecurity in sub-Saharan Africa (SSA) have become major concerns in... more Poverty, food, and nutrition insecurity in sub-Saharan Africa (SSA) have become major concerns in recent times. The effects of climate change, drought, and unpredictable rainfall patterns threaten food production and sustainable agriculture. More so, insurgency, youth restiveness, and politico-economic instability amidst a burgeoning population requiring a sufficient and healthy diet remain front-burner issues in the region. Overdependence on only a few major staple crops is increasingly promoting the near extinction of many crops, especially orphan legumes, which possess immense potentials as protein and nutritional security crops. The major staple crops are declining in yield partly to their inability to adapt to the continuously changing climatic conditions. Remarkably, the orphan legumes are climate-smart crops with enormous agronomic features which foster sustainable livelihood. Research efforts on these crops have not attained a reasonable comparative status with most commerci...
Phenotypic characterization of plant species is the basis for selection, conservation as well as ... more Phenotypic characterization of plant species is the basis for selection, conservation as well as improvement. Moringa oleifera (Lam.) is commonly grown as multi-purpose medicinal and leafy vegetable crop in Nigeria. This study evaluated phenotypic intraspecific variations among 40 accessions of M. oleifera collected from different agro-ecological zones. A total of 30 morphometric traits involving qualitative and quantitative vegetative, floral, fruit/pod and seed traits, seed set and germination percentages were combined for the analyses. Descriptive statistics, variance analysis, correlation coefficient, principal component analysis (PCA) and cluster analysis (CA) were used to evaluate the intraspecific variability. The accessions showed marked differences in floral, fruit pod and seed characters analyzed. Accessions edN037 (71 days), osN024 (73 days), ogN028 (74 days), oyN003 (75 days) and abN059 (76 days) were identified as early maturing accessions. Correlation coefficients r ≥ ...
2019 19th International Conference on Computational Science and Its Applications (ICCSA), 2019
Data is useless if information or knowledge that can be used for further reasoning cannot be infe... more Data is useless if information or knowledge that can be used for further reasoning cannot be inferred from it. Cluster analysis, based on some criteria, shares data into important, practical or both categories (clusters) based on shared common characteristics. In research, clustering and classification have been used to analyze data, in the field of machine learning, bioinformatics, statistics, pattern recognition to mention a few. Different methods of clustering include Partitioning (K-means), Hierarchical (AGNES), Density-based (DBSCAN), Grid-based (STING), Soft clustering (FANNY), Model-based (SOM) and Ensemble clustering. Challenges and problems in clustering arise from large datasets, misinterpretation of results and efficiency/performance of clustering algorithms, which is necessary for choosing clustering algorithms. In this paper, application of data clustering was systematically discussed in view of the characteristics of the different clustering techniques that make them better suited or biased when applied to several types of data, such as uncertain data, multimedia data, graph data, biological data, stream data, text data, time series data, categorical data and big data. The suitability of the available clustering algorithms to different application areas was presented. Also investigated were some existing cluster validity methods used to evaluate the goodness of the clusters produced by the clustering algorithms.
Moringa oleifera Lam. (Moringaceae) is a multi-purpose economic plant whose commercial demand is ... more Moringa oleifera Lam. (Moringaceae) is a multi-purpose economic plant whose commercial demand is on the increase in Africa. To meet this demand, it is significant to step up collections and diversity studies adaptable to higher productivity and utilization. The present study focuses on recently collected landraces/accessions of six populations of M. oleifera from different eco-geographical locations within Nigeria. A total of 70 accessions were evaluated for genetic intraspecific diversity using 20 SSR markers. Among the 20 SSR markers screened, 10 primer pairs (forward and reverse) were selected based on clear amplification products and reproducible scorable bands. Analysis of Molecular Variance (AMOVA), Principal Coordinates Analysis (PCoA) and cluster analysis (CA) were used to evaluate the genetic intraspecific diversity. A total number of 74 alleles with a range of 4 to 15 were detected among the 70 accessions. On the average, 7.4 alleles per locus were amplified in each access...
Frontiers in Plant Science
Poverty, food, and nutrition insecurity in sub-Saharan Africa (SSA) have become major concerns in... more Poverty, food, and nutrition insecurity in sub-Saharan Africa (SSA) have become major concerns in recent times. The effects of climate change, drought, and unpredictable rainfall patterns threaten food production and sustainable agriculture. More so, insurgency, youth restiveness, and politico-economic instability amidst a burgeoning population requiring a sufficient and healthy diet remain front-burner issues in the region. Overdependence on only a few major staple crops is increasingly promoting the near extinction of many crops, especially orphan legumes, which possess immense potentials as protein and nutritional security crops. The major staple crops are declining in yield partly to their inability to adapt to the continuously changing climatic conditions. Remarkably, the orphan legumes are climate-smart crops with enormous agronomic features which foster sustainable livelihood. Research efforts on these crops have not attained a reasonable comparative status with most commerci...
Journal of Ethnopharmacology, 2013
Annals of Agricultural Sciences
African Journal of Biotechnology, 2009
Carbohydrate-binding modules have been shown to alter plant cell wall structural architecture. He... more Carbohydrate-binding modules have been shown to alter plant cell wall structural architecture. Hence, they have the potential application of being used to engineer the plant to produce tailor-made natural fibers in the cell wall. The Clostridium thermocellum xylanase, Xyn10B, contains two CBMs that belong to family 22 (CBM22). The C-terminal CBM22-2 of the glycoside hydrolase (GH) 10 had been characterized
Phenotypic characterization of plant species is the basis for selection, conservation as well as ... more Phenotypic characterization of plant species is the basis for selection, conservation as well as improvement. Moringa
oleifera (Lam.) is commonly grown as multi-purpose medicinal and leafy vegetable crop in Nigeria. This study evaluated
phenotypic intraspecific variations among 40 accessions of M. oleifera collected from different agro-ecological zones. A
total of 30 morphometric traits involving qualitative and quantitative vegetative, floral, fruit/pod and seed traits, seed set
and germination percentages were combined for the analyses. Descriptive statistics, variance analysis, correlation
coefficient, principal component analysis (PCA) and cluster analysis (CA) were used to evaluate the intraspecific
variability. The accessions showed marked differences in floral, fruit pod and seed characters analyzed. Accessions
edN037 (71 days), osN024 (73 days), ogN028 (74 days), oyN003 (75 days) and abN059 (76 days) were identified as
early maturing accessions. Correlation coefficients r ≥ 0.70 were high and significant for reproductive characters. The
PCA and CA generated similar results. The first five principal component axes explained 61.40% of the total variation
with PC1 (23.92%) and PC2 (14.19%) contributing 38.11% of the total variation. The CA showed that the degree of
intraspecific similarity was high (66.82%) based on Euclidean similarity index. Nevertheless, four clusters were formed
indicating intraspecific phenotypic dissimilarity among the 40 accessions especially with the separation of accessions
that were collected from similar environments. The phenotypic variations could be explored for utilization, conservation
and for future genetic improvement by selection of accessions with promising agronomic characters.
Moringa oleifera Lam. (Moringaceae) is a multipurpose economic plant whose commercial demand is o... more Moringa oleifera Lam. (Moringaceae) is a multipurpose economic plant whose commercial demand is on the increase in Africa. To meet this demand, it is significant to step up collections and diversity studies adaptable to higher productivity and utilization. The present study focuses on recently collected landraces/accessions of six populations of M. oleifera from different eco-geographical locations within Nigeria. A total of 70 accessions were evaluated for genetic intraspecific diversity using 20 SSR markers. Among the 20 SSR markers screened, 10 primer pairs (forward and reverse) were selected based on clear amplification products and reproducible scorable bands. Analysis of Molecular Variance (AMOVA), Principal Coordinates Analysis (PCoA) and cluster analysis (CA) were used to evaluate the genetic intraspecific diversity. A total number of 74 alleles with a range of 4 to 15 were detected among the 70 accessions. On the average, 7.4 alleles per locus were amplified in each accession. Allele frequency varied from 0.214 to 0.671 with a mean of 0.477; gene diversity from 0.487 to 0.885 with a mean of 0.669 while the average PIC value was 0.633. The observed and expected heterozygosity varied from 0.00 to 0.50 with a mean of 0.972 and from 0.00 to 0.250 with a mean of 0.567, respectively. AMOVA shows that 8 % of the genetic diversity was attributed to differences among the populations while 92 % of the variation (significant at p = 0.001) was due to differences within populations. Allelic patterns across the six populations aligned with the AMOVA result. The results of PCoA and CA identified high intraspecific similarities with few exceptions. Similarity coefficients (SC) of CA ranged from 0.53 to 1.00 and delineated the 70 accessions into seven groups. All accessions are distinguishable from each other at SC 1.00 except (soN066 and taN085) and (anN045 and anN047). The genetic relationships highlighted are significant for conservation, cultivation and genetic improvement of M. oleifera in view of the species socioeconomic relevance to the people of Nigeria and Africa in general.
Journal of Ethnopharmacology, 2013
Phenotypic characterization of plant species is the basis for selection, conservation as well as ... more Phenotypic characterization of plant species is the basis for selection, conservation as well as improvement. Moringa oleifera (Lam.) is commonly grown as multipurpose medicinal and leafy vegetable crop in Nigeria. This study evaluated phenotypic intraspecific variations among 40 accessions of M. oleifera collected from different agro-ecological zones. A total of 30 morphometric traits involving qualitative and quantitative vegetative, floral, fruit/pod and seed traits, seed set and germination percentages were combined for the analyses. Descriptive statistics, variance analysis, correlation coefficient, principal component analysis (PCA) and cluster analysis (CA) were used to evaluate the intraspecific variability. The accessions showed marked differences in floral, fruit pod and seed characters analyzed. Accessions edN037 (71 days), osN024 (73 days), ogN028 (74 days), oyN003 (75 days) and abN059 (76 days) were identified as early maturing accessions. Correlation coefficients r ≥ 0.70 were high and significant for reproductive characters. The PCA and CA generated similar results. The first five principal component axes explained 61.40% of the total variation with PC1 (23.92%) and PC2 (14.19%) contributing 38.11% of the total variation. The CA showed that the degree of intraspecific similarity was high (66.82%) based on Euclidean similarity index. Nevertheless, four clusters were formed indicating intraspecific phenotypic dissimilarity among the 40 accessions especially with the separation of accessions that were collected from similar environments. The phenotypic variations could be explored for utilization, conservation and for future genetic improvement by selection of accessions with promising agronomic characters.