Metals in Natural Water Samples

Crompton, T. R.

doi:10.1016/b978-0-12-802654-0.00001-5

Cited by 2 publications

(1 citation statement)

References 35 publications

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“…Similar to heavy metal pressure, radioactive strontium (90 Sr) is released into the environment through reactions such as nuclear fission [10,11], causing environmental pollution after settling in the form of atmospheric, water, and soil cycles [12]. According to a survey, compared with the strontium concentration in nature (160 mg/g), the soil Sr reached 247 mg kg to form a stable pollution [13,14]. The content of strontium in the soil is therefore typically higher than that of Ni, Cu, or Zn [15], and a large amount of Sr accumulation has been observed in some plants exposed to water culture, such as cabbage, lettuce, etc.…”

Section: Introductionmentioning

confidence: 99%

Photosynthetic Responses of Racomitrium japonicum L. to Strontium Stress Evaluated through Chlorophyll a Fluorescence OJIP Transient Analysis

Ren,

Lu,

Tang

et al. 2024

Plants

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Nuclides pollution and its biological effects are of great concern, especially for bryophytes during their terrestrial adaptation. Understanding PSII activity and electron transport response is vital for comprehending moss abiotic stress reactions. However, little is known about the photosynthetic performance of moss under nuclide treatment. Therefore, this study aimed to evaluate the chlorophyll fluorescence of Racomitrium japonicum L. The moss was subjected to Sr2+ solutions at concentrations of 5, 50, and 500 mg/L to evaluate chlorophyll a fluorescence using the OJIP test. Moderate and high Sr2+ stress led to inner cell membrane dissolution and reduced chlorophyll content, indicating impaired light energy absorption. At 5 mg/L Sr2+, fluorescence kinetics showed increased light energy capture, energy dissipation, and total photosynthetic driving force, thus stimulating transient photosynthetic activity of PSII and improving PSI reduction. Linear electron transfer and PSII stability significantly decreased under moderate and high Sr2+ stress, indicating potential photosynthetic center damage. Cyclic electron transfer (CEF) alleviated photosynthetic stress at 5 mg/L Sr2+. Thus, low Sr2+ levels stimulated CEF, adjusting energy flux and partitioning to protect the photosynthetic apparatus. Nevertheless, significant damage occurred due to inefficient protection under high Sr2+ stress.

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