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Detection of Cadmium Risk to the Photosynthetic Performance of . | LitMetric

AI Article Synopsis

  • Photosynthesis is crucial for plant growth and crop yield, yet the toxic effects of cadmium (Cd) on this process need further research, particularly in how it influences photosynthetic performance in plants exposed to various concentrations of Cd over three months.* -
  • The study found that as soil Cd levels increased, Cd concentration in leaves also rose, leading to significant reductions in photosynthesis and chlorophyll content, especially at higher Cd doses (50-100 mg/kg), while lower concentrations showed minimal changes.* -
  • Cd exposure negatively impacted key photosynthetic functions by reducing Rubisco activity, impairing RuBP regeneration, hindering light energy utilization, and altering chlorophyll fluorescence, indicating that photosynthesis was limited through multiple mechanisms, including

Article Abstract

Photosynthesis plays an essential role in plant growth and crop yield, and the mechanisms of the effects of cadmium (Cd) on photosynthetic performance require more attention. The acute toxicity of Cd in soil to the photosynthetic capacity of was evaluated using gas exchange parameters, / curves, light response curves, and chlorophyll fluorescence transients after exposure to elevated Cd concentrations (0, 10, 20, 50, 70, and 100 mg kg) for a 3-month period. The results indicated that leaf Cd concentration in increased with the strength of soil Cd stress and ranged from 4.9 to 15.8 μg g DW. The accumulation of leaf Cd severely restricted photosynthesis and its non-stomatal limitation in regulating the photosynthetic performance of . The leaf chloroplasts at 10 and 20 mg kg Cd concentrations showed no noticeable change, but the chlorophyll content significantly decreased by 9.0-20.4% at 50-100 mg kg Cd concentrations. The Cd treatments also decreased plant ribulose-1,5-bisphosphate (RuBP) activity ( ) and regeneration capacity ( ), triose phosphate utilization (), light-saturated photosynthesis ( ), apparent quantum yield (), light saturation point (), and dark respiration ( ), but Cd treatment increased the light compensation point (). The shape of chlorophyll fluorescence transients in leaves was altered under different Cd treatments. The increased OJ phase and the decreased IP phase in fluorescence induction curves suggested that Cd toxicity inhibited both light use efficiency and photodamage avoidance ability. These results suggested that the decrease in photosynthesis through exposure to Cd may be a result of the decrease in leaf chlorophyll content, Rubisco activity, and RuBP regeneration, inhibition of triose phosphate utilization, reduction of the ability to use light and provide energy, and restrictions on electron transport in PSII.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6596316PMC
http://dx.doi.org/10.3389/fpls.2019.00798DOI Listing

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