Sulfur deficiency induced 1 (SD1) and SD2 are –S marker genes sulfur deficiency that act as major repressors controlling GSL biosynthesis in Arabidopsis under –S condition. SDI1 and SDI2 expression negatively correlated with GSL biosynthesis in both transcript and metabolite levels. Principal components analysis of transcriptome data indicated that SDI1 regulates aliphatic GSL biosynthesis as part of –S response. SDI1 was localized to the nucleus and interacted with MYB28 a major transcription factor that promotes aliphatic GSL biosynthesis in both yeast and plant cells (Aarabi et al. 2016)