pharmaceutics Article Comparative Metabolite Profile, Biological Activity and Overall Quality of Three Lettuce (Lactuca sativa L., Asteraceae) Cultivars in Response to Sulfur Nutrition Muna Ali Abdalla 1,* , Fengjie Li 2 , Arlette Wenzel-Storjohann 2, Saad Sulieman 1, Deniz Tasdemir 2,3 and Karl H. Mühling 1,* 1 Institute of Plant Nutrition and Soil Science, Kiel University, Hermann-Rodewald-Str. 2, 24118 Kiel, Germany;
[email protected] 2 GEOMAR Centre for Marine Biotechnology (GEOMAR-Biotech), Research Unit Marine Natural Products Chemistry, GEOMAR Helmholtz Centre for Ocean Research Kiel, Am Kiel-Kanal 44, 24106 Kiel, Germany; fl
[email protected] (F.L.);
[email protected] (A.W.-S.);
[email protected] (D.T.) 3 Faculty of Mathematics and Natural Sciences, Kiel University, Christian-Albrechts-Platz 4, 24118 Kiel, Germany * Correspondence:
[email protected] (M.A.A.);
[email protected] (K.H.M.); Tel.: +49-431-880-6471 (M.A.A.); +49-431-880-3189 (K.H.M.) Citation: Abdalla, M.A.; Li, F.; Abstract: The main objective of the present study was to assess the effects of sulfur (S) nutrition Wenzel-Storjohann, A.; Sulieman, S.; on plant growth, overall quality, secondary metabolites, and antibacterial and radical scavenging Tasdemir, D.; Mühling, K.H. activities of hydroponically grown lettuce cultivars. Three lettuce cultivars, namely, Pazmanea RZ Comparative Metabolite Profile, (green butterhead, V1), Hawking RZ (green multi-leaf lettuce, V2), and Barlach RZ (red multi-leaf, Biological Activity and Overall V3) were subjected to two S-treatments in the form of magnesium sulfate (+S) or magnesium chloride Quality of Three Lettuce (Lactuca (−S).