Updated project metadata. Gmdnj1-knockout mutants had diminished growth in normal conditions, and when under heat stress, exhibited more severe browning, reduced chlorophyll contents, higher reactive oxygen species (ROS) contents, and higher induction of heat stress-responsive transcription factors and ROS-scavenging enzyme-encoding genes. Knocking out a major HSP40 may lead to the impairment of the protein refolding system, and in turn lead to a change in the aggregated protein profile. Therefore, the aggregated protein profiles of the Gmdnj1 mutant lines were compared against that of the wild type Williams 82 under both untreated and heat-treated conditions.