Towards a biochemical marker for superficial scald susceptibility
Jordi Gine, Vincent Mathieu-Hurtiger, Pascale Westercamp, Claude Coureau, Christian Larrigaudiere
Abstracts of 7th International Postharvest Symposium 2012 (IPS2012). 25-29 June, 2012. Putra World Trade Centre (PWTC), Kuala Lumpur, Malaysia. 238 pages.
2012
บทคัดย่อ
Cold storage of apples under regular or modified atmospheres depending on the cultivar, on fruits developing superficial scald, a chilling-type disorder of paramount importance for apple growers worldwide. Oxidation of afamesene into conjugated trienes (CTs) in the peel tissue is thought to playa key role in the development of scald. To date, no alternatives are available to predict the incidence of this disorder in fruits stored under different conditions albeit some researchers have proposed the ratio between CTs and certain lipophilic antioxidants to be correlated with scald incidence in a range of cultivars. The present study, conducted with highly susceptible 'Granny Smith' apples, studied the relationship between several biochemical markers (viz. a-famesene, antioxidant capacity, hydrogen peroxides, CTs and specific antioxidants) and scald incidence in fruits kept under different storage regimes (viz. CA, DCA, ULO and CA + I-MCP). The results showed that neither changes in fruit antioxidant potential nor the generation of hydrogen peroxide within the fruit tissues were associated with scald incidence. The already established ratio between specific antioxidants and/or CTs (CT258/CT28I) failed to predict scald susceptibility. In contrast, a novel and accurate index (r 2= 0.75), based on a-famesene accumulation dynamics dming early stages of storage « 50 days) is proposed aiming to predict scald susceptibility in different apple cultivars.