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

SOSSI ML; BOGGIO SB; ESCOBAR MR; VALLE EM

Córdoba

Congreso; XXXII Reunión Argentina XVI Congreso Latinoamericano de Fisiología Vegetal; 2018

Sociedad Argentina de Fisiología Vegetal

Chilling injury (CI) limits cold storage (CS) of tomatofruit. The effect of CS on the lipidome of tomato fruitsof two contrasting varieties was analyzed to understand the mechanisms of generation of postharvest CI.Micro-Tom (tolerant) and Minitomato (sensible) fruitswere harvested at mature green stage, refrigerated fourweeks (4ºC) and then transferred to a shelf in the growing cabinet (25 ºC). The pericarp lipid compositionwas analyzed by liquid chromatography-tandem massspectrometry (LC-MS/MS).The CS effecton thelipidome was different in thetwovarieties: the glycerolipids unsaturation degree increased inboth varieties, butreturned totheinitialvalue after CS onlyin Micro-Tom; the average acylchain longitude decreasedinMicro-Tomglycolipids and increased inMinitomato phospholipids; the relative content of mono- and digalactosyldiacylglycerol diminished and increased, respectively, inboth varieties and returned to the initial values after CS,althoughMinitomatorecoveringwasslower; and the phosphatidylethanolaminerelativecontentincreased,whilethephosphatidylcholinerelativecontent decreased,onlyinMinitomato.The different effect of CS on membrane lipid composition between the varieties would be related with differential capacity to maintain appropriate membranefluidity and can explain the differential sensibility ofMicro-Tom and Minitomato tomato fruits to CI.