Change of Photosynthetic Gas Exchange and Chlorophyll Fluorescence of Cd-Sensitive Mutant Rice in Response to Cd Stress

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.

• Periodical: Advanced Materials Research (Volumes 807-809)
• Pages: 336-341
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.807-809.336
• Online since: September 2013
• Authors: Jun Yu He*, Yan Fang Ren, Cheng Zhu, Dean Jiang
• Keywords: Cadmium (Cd), Chlorophyll Fluorescence, Photosynthesis, Rice

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