Transcriptome Dynamics Underlying Magnesium Deficiency Stress in Three Founding Species.

Modern sugarcane cultivars were generated through interspecific crossing of the stress resistance and the high sugar content which was domesticated from . Magnesium deficiency (MGD) is particularly prominent in tropical and subtropical regions where sugarcane is grown, but the response mechanism to MGD in sugarcane remains unknown. Physiological and transcriptomic analysis of the three founding species under different magnesium (Mg) levels was performed. Our result showed that MGD decreased chlorophyll content and photosynthetic efficiency of three species but led to increased starch in leaves and lignin content in roots of and . We identified 12,129, 11,306 and 12,178 differentially expressed genes (DEGs) of , and , respectively. In , MGD affected signal transduction by up-regulating the expression of xylan biosynthesis process-related genes. responded to the MGD by regulating the expression of transcription and detoxification process-related genes. , avoids damage from MGD by regulating the expression of the signing transduction process and the transformation from growth and development to reproductive development. This novel repertoire of candidate genes related to MGD response in sugarcane will be helpful for engineering MGD tolerant varieties.