HD1 — Sorghum bicolor

Summary

SbHD1 (SORBI_3006G067600) on sorghum chromosome 6 encodes a histone deacetylase with NAD-independent activity, also annotated with histone demethylase, transcription corepressor, and calcium-dependent protein serine/threonine kinase activities. The protein localizes to HDAC and PRC2 complexes, the nucleolus, and plastids. SbHD1 is associated with abiotic stress tolerance, melatonin metabolism, negative regulation of seed maturation, fruit abscission, and regulation of embryonic development. It has been linked to traits including floral organ length, fruit ripening, branch angle, leaf elongation rate, total soluble sugar content, and vegetative-to-reproductive phase transition. Studies of related genes in other species connect the family to salt tolerance, brassinosteroid signaling, grain yield, panicle number, and heading time, though these associations are not yet established in sorghum.