Differential lipidome remodelling during postharvest of peach varieties with different susceptibility to chilling injury

BUSTAMANTE, CLAUDIA; BROTMAN, YARIF; MONTI, LAURA; GABILONDO, JULIETA; BUDDE, CLAUDIO OLAF; LARA, MARÍA VALERIA; FERNIE, ALISDAIR R; DRINCOVICH, MARÍA FABIANA

PHYSIOLOGIA PLANTARUM

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2017 vol. 163 p. 2 - 17

0031-9317

Many peach fruits develop chilling injury (CI) during storage at low temperature. Given that cell membranes are likely sites of the primary effects of chilling, the lipidome of six peach varieties with different susceptibility to CI was analyzed under different postharvest conditions. The decreases in fruit firmness during postharvest ripening were accompanied by changes in the content of several plastidic glycerolipid and triacylglyceride species, which may indicate their use as fuels prior to fruit senescence. Galactolipid content also changed in fruits stored at 0 ºC for short and long periods, reflecting the stabilization of plastidic membranes at low temperature. When comparing susceptible and resistant varieties, the content of certain species of the lipid classes phosphatidylethanolamine, phosphatidylcholine and digalactosyldiacylglycerol correlated with the tolerance to CI, reflecting the importance of the plasma membrane in the development of CI symptoms and allowing the identification of possible lipid markers for chilling resistance. Finally, transcriptional analysis of genes involved in galactolipid metabolism revealed candidate genes responsible for the observed changes after cold exposure. When taken together, our results highlight the importance of plastids in the postharvest physiology of fruits and provide evidence that lipid composition and metabolism has a profound influence on the cold response.