JIP-test parameters to study apple peel photosystem II behavior under high solar radiation stress during fruit development

V. BLACKHALL, G.A. ORIOLI, G.M. COLAVITA

PHOTOSYNTHETICA

SPRINGER

Lugar: Berlin; Año: 2020 vol. 58 p. 129 - 137

0300-3604

Changes in apple (Malus domestica Bork.) peel PSII photochemical process during fruit development under high solarradiation field conditions were analysed by the JIP-test to increase understanding on energy dissipation and susceptibilityto photooxidative damage. Fruits growing exposed (E), non-exposed (NE) or suddenly exposed (SU) to high solar radiationwere evaluated at three developmental stages. Chlorophyll content and chlorophyll a fluorescence transient (OJIP), wereaffected by high solar radiation and development. Minimum fluorescence, maximum fluorescence, maximum quantumyield of photochemistry, and specific fluxes per cross section decreased in E and SU fruits. JIP parameters were a sensitiveindicator of high solar radiation stress in apple peel. Peroxidative damage was observed in E fruits at each stage ofdevelopment and in SU fruits at early and mid-stages. By delineating the photochemical events induced by solar radiationin apple fruits at different developmental stages, our findings might help to increase understanding on susceptibility ofapple to photooxidation damage depending on the light environment and developmental stage they are exposed to.