In cooperation with other chaperones, Hsp70s are key components that facilitate folding of de novo synthesized proteins, assist translocation of precursor proteins into organelles, and are responsible for degradation of damaged protein under stress conditions. Expressed in cotyledons, leaves, stems, vascular bundles, roots, stigmas and anthers. Down-regulated during seed maturation. Induced by heat shock and cold (PubMed:11402207). Up-regulated by viral infection (PubMed:15805473). Induced by infection with the bacterial pathogen Pseudomonas syringae (PubMed:18065690). Induced by cytokinin (PubMed:28004282). No visible phenotype, under normal growth conditions. Belongs to the heat shock protein 70 (TC 1.A.33) family. DnaK subfamily.