Several
studies have related heat tolerance with the increase of heat
shock proteins (HSPs), antioxidant enzymes and phytochemicals
such as carotenoids and phenolic compounds.
Ghasemnezhad, Marsh, Shilton, Babalar, and Woolf
(2008) found an increase in superoxide dismutase (SOD),
peroxidase (POD) and catalase (CAT) activities after hot
water treatments in mandarins. Talcott et al. (2006) found
an increase in polyphenols and carotenoids and better antioxidant
capacity in hot water treated compared with untreated
mangoes.