HSS — Brassica napus

Summary

BnHSS (HSS, also known as BnARF2) on chromosome C03 of oilseed rape (Brassica napus) encodes a protein with transcription corepressor activity, protein heterodimerization activity, sequence-specific DNA binding, protein kinase activity, transcription cis-regulatory region binding, identical protein binding, protein serine/threonine kinase activity, protein homodimerization activity, DNA binding transcription factor activity, and protein binding, and contains ARF, AUX/IAA, and B3 DNA-binding domains. It is associated with negative regulation of transcription by RNA polymerase II, inhibition of brassinosteroid-mediated signalling, maintenance of floral meristem identity, fruit dehiscence, floral organ abscission, root hair cell differentiation, and upregulation of potassium import. The gene is linked to numerous traits including seed weight, seed coat color, stem strength, root length and thickness, flowering time, petal number, auxin sensitivity, jasmonic acid content, and low temperature stress response. Phenotypic associations include organ size, senescence, drought tolerance, seed mass, root growth, and resistance to Sclerotinia sclerotiorum. Studies of related genes in other species connect the family to leaf longevity, flavonol and proanthocyanidin biosynthesis, and developmental senescence.