HD1 — Sorghum bicolor

Summary

SORBI_3004G091200 (SbHD1) on sorghum chromosome 4 encodes a protein with a His_deacetylse domain family and has histone deacetylase activity, NAD-independent, as well as histone deacetylase binding, transcription corepressor activity, and is associated with the HDAC complex. In sorghum, SbHD1 is associated with abiotic stress tolerance and melatonin metabolism. The gene is linked to regulation of seed maturation, floral organ abscission, and fruit ripening traits, as well as responses to biotic stimuli, radiation, and temperature stress. Associations extend to agronomic traits including grain yield, panicle number, leaf morphology, and plant size. Studies of related histone deacetylases in rice and Arabidopsis link the family to salt tolerance, brassinosteroid signaling, flower development, and systemic acquired resistance, though these functions are not yet established for SbHD1 itself.