Unravelling the cold-induced regulation of ethylene and ?-farnesene and its involvement with the development of scald-like disorders in different pear cultivars

To better understand the cold-induced regulation of scald-like disorders in pears and specific roles played by ethylene ?-farnesene, three pear cultivars with different patterns production chilling requirement were used this study. Fruit treated 1-MCP (ethylene inhibitor) Lovastatin (?-farnesene stored at -0.5 °C 90 % RH during 6 months. Changes targeted metabolites, enzymes genes monitored periodically up to 120 d storage superficial scald incidence was assessed after time 180 cold storage. treatment induced a down-regulation PcACS1, PcACO1, PcERF1 PcAFS1 gene expression, but also significant up-regulation PcETR1 PcEIN2 that led all cases inhibition disorder incidence. In contrast, caused diverse molecular or biochemical responses depending on cultivar. ‘Blanquilla’ pears, completely inhibited reinforcing idea ethylene-?-farnesene interaction plays decisive role contrast 1-MCP, did not control ‘Flor d’Hivern’ pears. Inversely, development disorder, showing then biosynthetic signalling pathway may even producing very low undetectable levels. Finally, inefficacy both treatments prevent ‘Conference’ suggests existence from observed for other whose basis remain unknown. Collectively our results show regulatory processes triggered stress are complex cultivar dependent.