Exogenous calcium-alleviating effect on sodium salt-induced phytotoxicity associated with changes in photosynthetic characteristics of wheat seedlings

Abstract

rate; EGTA -ethylene glycol tetraacetic acid; ETR -electron transport rate; F0 -minimal fluorescence yield of the dark-adapted state; F0' -minimal fluorescence yield of the light-adapted state; FM -fresh mass; Fm -maximum fluorescence yield of the dark-adapted state; Fm' -maximal fluorescence yield of the light-adapted state; Fs -the steady-state Chl fluorescence yield; Fv -variable fluorescence; Fv/Fm -maximal quantum yield of PSII photochemistry; gs -stomatal conductance; NPQ -nonphotochemical quenching; PN -net photosynthetic rate; qP -photochemical quenching; ROS -reactive oxygen species; Y(Ⅱ) -the actual photochemical efficiency; Y(NPQ) -the electron yield of regulatory energy dissipation.