Characterization of peach cultivars with different susceptibility to chilling injury

GENERO, MELINA; GABILONDO, JULIETA; BUDDE, CLAUDIO OLAF; ANDREO, CARLOS SANTIAGO; LARA, MARÍA VALERIA; DRINCOVICH, MARÍA FABIANA; BUSTAMANTE, CLAUDIA

Potrero de los funes

Congreso; XLVII Reunión Anual de SAIB; 2011

Sociedad Argentina de Investigación en Bioquímica y Biología Molecular

Refrigeration of peaches during marketing and shipping affectsfruit quality causing physiological disorders collectively namedchilling injury (CI). CI is genetically influenced and triggered by acombination of storage temperature and storage period. In thiswork, early-, mid- and late-season peach cultivars were examinedat harvest, during ripening at 20ºC until reaching firmness values<2 kgf, after cold storage (3 weeks, 0ºC) and after cold storage plusripening at 20ºC. Among the tested cultivars, and based onextractable juice measurements, Springlady and Flordaking fruitsshowed contrasting susceptibility to CI symptoms after coldstorage. After 3 weeks at 0ºC plus ripening at 20ºC Springladypeaches had expressible juice similar to that of unstored fruit heldfor 5 days at 20ºC, while Flordaking fruits had significantly lowerexpressible juice, thus being more susceptible to woolliness.Quality attributes, ethylene production and the expression of genesencoding proteins involved in cell wall metabolism (determined byqRT-PCR) were analyzed in these two cultivars. Thus, our aim is toinspect for transcripts associated with cell wall metabolism thatcould be differentially accumulated in these two cultivars withcontrast susceptibility to CI in order to identify the principal cellwall proteins involved in the alleviation of CI.