Sulfur (S) assimilation by plants plays a key role in the S cycle in nature, and metabolism of the assimilated S provides various compounds that are useful for animals, including humans. It is important to understand the mechanisms involved in systemic S metabolism in order to improve crop agronomy and the production of dietary and nutraceutical plants. Recent advances in ‘-omic’ studies have provided comprehensive insights into S metabolism. These studies may be regarded as important case studies that provide information on the complicated regulatory mechanisms involved in plant metabolism.
