AbdulRahaman, Abdullahi, A.,Garuba, TaofeeqAdekoya, O,Oladele, Fidelix A.2024-04-172024-04-1720131. AbdulRahaman, A.A., Garuba, T. Adekoya, O.A. & Oladele, F.A. (2013): Effects of Pseudomonas syringae infection on the stomatal anatomy and leaf morphology in Lycopersicon esculentum. The Bioscientist, 1(1); 14-21https://uilspace.unilorin.edu.ng/handle/123456789/12013In pathogenesis, pathogenic penetration is one of the basic steps in disease development. For foliar bacterial plant pathogens, natural surface openings, such as stomata, and wounds are important entry sites. These surface openings have been considered passive points of entry for plant pathogenic bacteria. Lycopersicon esculentum was inoculated with Pseudomonas syringae to induce a diseased condition. Subsequently leaf anatomical studies were carried out to observe the penetration ports of the bacterium. Rupture of guard cells, reduced in size of stomata and occurrence of small dark microscopic spots on the stomata are features which serve as an indication of pathogenic penetration. Also morphological growth parameters assessed revealed significant reduction in plant height, leaf length, leaf area and leaf weight in the test plant compared with the control. However, no significant differences were observed in terms of number of leaf and width of the leaf. The results suggest that disruption of stomatal anatomy by the bacterium will translates to low yield and accumulation of impurities such as carbondioxide from the atmosphere.enPseudomonas syringaeinfectionstomatal anatomyleaf morphology and Lycopersicon esculentumArticle