Abstract
The growth, photosynthetic gas exchange and chlorophyll fluorescence were investigated in wild type and mutant rice plants treated with 50 μmol L-1 Cd. The results showed that plant height, dry mass, and chlorophyll content decreased by Cd treatment, and the mutant showed more severe reduction than wild type rice. Net photosynthetic rate (Pn), transpiration rate (E), stomatal conductance (Gs), maximal photochemical efficiency of PSII (Fv/Fm), effective PSII quantum yield (ΦPS2), and photochemical quenching (qP) were decreased and intercellular CO2 concentration (Ci) and and non-photochemical quenching (qN) were enhanced in Cd-treated plants with the increasing of Cd exposure time, with changes in the mutant being more evident. The results suggest that Cd inhibits photosynthesis due to non-stomatal limitations and the response of PSII reaction centre and the mutant has less capacity of acclimation to Cd stress.
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