FRUIT LIPIDOME REMODELLING OF TOMATO VARIETIES WITH DIFFERENTIAL TOLERANCE TO POSTHARVEST CHILLING INJURY

VALLE EM; ESCOBAR M; SOSSI ML; BOGGIO SB

Congreso; RAFV 2018; 2018

FRUIT LIPIDOME REMODELLING OF TOMATO VARIETIES WITH DIFFERENTIAL TOLERANCE TO POSTHARVEST CHILLING INJURYChilling injury (CI) limits cold storage (CS) of tomato fruit. The effect of CS on the lipidome of tomato fruits of two contrasting varieties was analyzed. Micro-Tom (tolerant) and Minitomato (sensible) fruits were harvested at mature green stage, refrigerated four weeks (4ºC) and then transferred to 25 ºC. The pericarp lipid composition was analyzed by liquid chromatography-tandem mass spectrometry (LC-MS/MS).The CS effect on the lipidome was different in the two varieties: the glycerolipids unsaturation degree increased in both varieties, but returned to the initial value after CS only in Micro-Tom; the average acyl chain longitude decreased in Micro-Tom glycolipids and increased in Minitomato phospholipids; the relative content of mono- and digalactosyldiacylglycerol diminished and increased, respectively, in both varieties and returned to the initial values after CS, although Minitomato recovering was slower; and the phosphatidylethanolamine relative content increased, while the phosphatidylcholine relative content decreased, only in Minitomato.The different effect of CS on membrane lipid composition between the varieties would be related with differential capacity to maintain appropriate membrane fluidity and can explain the differential sensibility of Micro-Tom and Minitomato tomato fruits to CI.