Imaging Techniques for Studying Plant-Pathogen Interactions: A Case Study on Tomato Fruits from the Biological Garden of Sokoto State University, Nigeria

Abstract

Plant–pathogen interactions are complex, dynamic processes governed by tightly regulated cellular and molecular mechanisms that determine the outcome of infection. Solanum lycopersicum , a globally significant horticultural crop, is particularly vulnerable to a wide range of bacterial pathogens that adversely affect fruit quality, marketability, and overall yield. This study investigated the interactions between tomato fruits cultivated in the Biological Garden of Sokoto State University and their associated bacterial pathogens using advanced imaging and analytical techniques. Bacterial isolates were obtained from infected fruit samples and identified using standard microbiological and morphological approaches. Three dominant bacterial species were isolated and identified as Pseudomonas syringae, Xanthomonas campestris and Bacillus subtilis. The study employed Scanning Electron Microscopy , Transmission Electron Microscopy , and Confocal Laser Scanning Microscopy to examine pathogen colonization, structural alterations in host tissues, and the spatial distribution of bacterial cells at the plant–pathogen interface. Particular emphasis was placed on elucidating the role of pathogen-derived effectors in facilitating infection, including their involvement in host cell wall degradation, immune suppression, and intracellular colonization. Furthermore, the study characterized adhesion dynamics and interaction forces between bacterial cells and tomato tissue surfaces, providing insights into the initial stages of infection and biofilm formation. Microscopic observations revealed distinct invasion patterns, including surface attachment, penetration through natural openings, and subsequent tissue disintegration. The findings contribute to a deeper understanding of bacterial infection strategies and host defense responses in tomato fruits. This knowledge provides a foundation for developing improved disease management strategies, enhancing resistance breeding programs, and mitigating post-harvest losses in tomato production systems.

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