This cluster of papers focuses on the molecular functions and regulations of transporters and assimilatory enzymes involved in sulfur metabolism in photosynthetic organisms, particularly in Arabidopsis thaliana. It explores the pathways, regulations, and genetic studies related to sulfur assimilation, sulfate transporters, metabolic responses to sulfur deprivation, and the interplay of biosynthetic pathways under sulfur depletion. Additionally, it delves into the integration of nitrogen management strategies to improve seed yield and oil content in winter oilseed rape, as well as the effects of nitrogen and sulfur on canola yield and nutrient uptake.