Protein chaperone involved in seed maturation and dormancy maintenance after high temperature fluctuation (e.g. secondary dormancy after 3 days at 40 degrees Celsius), probably by protecting heat labile proteins required for secondary dormancy (e.g. G6PDH, HOP3, SR45, ECP63, SCL33, RPL32B, ChlADR1, MSBP1, MBF1B, At3g01690, At1g15280, At1g15290, At2g31410, At1g11630, At1g65090, EMB2279, EMB1674 and RPL35C). Increased seed germination rate after high temperature fluctuation due to a reduced seed dormancy; fail to enter secondary dormancy after 3 days at 40 degrees Celsius. Boiling-stable protein. Belongs to the LEA type 3 family.