HSP70 — Asparagus officinalis

Summary

A4U43_C10F17410 (AoHSP70) encodes a stromal 70 kDa heat shock-related protein, chloroplastic, a member of the Hsp70 chaperone family with ATPase and protein-folding chaperone activity. It is associated with protein folding in the endoplasmic reticulum, the ERAD pathway, the unfolded protein response, sumoylation, steroidogenesis, and downregulation of ethylene-mediated signaling. The gene is linked to chloroplast development, thermotolerance, osmotic and heat stress tolerance, ROS scavenging, and ethylene sensitivity. Associations with agronomic traits include photosynthetic rate, stomatal resistance and opening, leaf senescence, seed growth and development, flowering time, root morphology, stem elongation, and abscisic acid sensitivity. The protein localises to the chloroplast stroma, thylakoid, chloroplast envelope, ER lumen, and apoplast. Studies of related genes in other species link the family to protein import into chloroplasts, seed germination, and embryo viability.