Genetic Diversity of Tomato (Solanum Lycopersicum L.) in Northern Nigeria and Shelf-life Stability of Its Powder

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dc.contributor.advisorDr. Aminat Adelekan
dc.contributor.authorFAGBEMI, Stephen Akintomide
dc.date.accessioned2026-08-27T10:54:17Z
dc.date.available2026-08-27T10:54:17Z
dc.date.issued2021-07-06
dc.descriptionxiv,196pages,illustration;.hardback
dc.description.abstractThe Northern part of Nigeria is reputed for its huge tomatoes production in Africa. Tomato powder has not been fully utilized as a way of mitigating postharvest losses. The main objective of this study was to investigate the genetic diversity of some tomato varieties from the Northern Nigeria and shelf stability of their powder with a view of reducing post-harvest losses. Standard screen house was used and laboratory procedures were in the study using molecular and conventional methods. The nineteen selected tomato varieties evaluated showed statistically significant differences in the morphological characteristics (p< 0.05). The samples showed marked differences in morphological features studied. Agro-morphological dendrogram result showed that all 19 samples were distinct at 100% similarity coefficient but at lower similarity index, there were four clusters. Genetie diversity based on SSR markers in 15 lines showed 3 markers to be polymorphie and 11 monomorphic. The genetic similarity was highest at 86% between Mai Kano and Derica Long. Molecular variance was more within the varieties at 47% than among the population (22%) and within individual (31%). Nutrient content results showed that Nassarawa Roma 2 and Dan India (Zamfara) tomato varieties were rich in Lycopene content in both the fresh and dry tomato samples while Dan India and Derica Sweet samples were rich in Calcium. Derica Oblong is rich in Iron content in the dry samples and UTC 02 in the fresh samples. Derica Oblong and Kano Tangino were rich in Zine both in the dry and fresh samples. In fresh tomato samples proximate analyses results showed that Derica Sweet has highest protein content, Niger Roma 1 highest in carbohydrate content and Nassarawa Roma I highest in Ash content respectively. However, in the dry samples, Derica Sweet is highest in protein, Dan Nassarawa in Carbohydrate and Roma Zaria in Ash respectively. Sensory evaluation results of the tomato powder showed that Niger Roma 1 has highest acceptability in appearance, Derica Small for taste, Derica Sweet for texture respectively. Analysis of the microbial count revealed that Derica Small and UTC1 had the highest bacteria and fungi count at 2.0 cfu/ml x 10' and 22.8 cfu/ml x 10' respectively while Dan Nassarawa had the lowest bacteria and fungi at 0.1 cfu/ml x 10' and 0.2 cfu/ml x 10' respectively. Shotgun metagenomic analysis was used to assess the microbial communities in dried tomato powder and the results showed that prominent members of bacterial diversity at the genus level are Klebsiella, Lactococcus, Pediococcus, Aerococcus, Acetobacter, Xanthobacter, Pseudoxanthomonas and Leucobacter. Fungi diversity at the genus level includes Fusarium, Geotrichum, Trichoderma, Saccharomyces and Galactomyces. Data obtained in this study could be useful in breeding programmes for tomato crop improvement plans as well as the use of the varieties for industrial food processing, home use and food security.
dc.identifier.urihttps://ir.bellsuniversity.edu.ng/handle/123456789/509
dc.language.isoen
dc.publisherBells University of Technology
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectNorthern
dc.subjectProducts
dc.titleGenetic Diversity of Tomato (Solanum Lycopersicum L.) in Northern Nigeria and Shelf-life Stability of Its Powder
dc.typeDissertation

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