Scholarlink

<p>Understanding the intricate fate of atmospheric particulate matter (PM<sub>10</sub>)-associated heavy metals within medicinal plants is crucial for environmental and public health. This study rigorously investigated the speciation, bioavailability, and cellular-physiological impacts of PM<sub>10</sub>-borne lead (Pb), cadmium (Cd), and arsenic (As) on <i>Andrographis paniculata</i>, tracing their dynamics across soil and plant tissues. The experiment was conducted near a busy traffic junction, comparing uncontaminated (T1) and metal-contaminated (T2) soils. PM<sub>10</sub>-Pb was predominantly (76%) in the residual fraction, whereas Cd was largely (66.5%) in the oxidizable fraction. As concentrations were too low for detailed PM<sub>10</sub> fractionation. In <i>A. paniculata</i>, Pb exhibited higher accumulation but lower mobility than Cd. PM deposition induced significant leaf surface roughening, aggregate formation at trichomes, and altered stomatal morphology. The multivariate analysis delineated the dynamic relationship between PM<sub>10</sub>-associated metal speciation and their subsequent subcellular sequestration. Also, the distinct metal sequestration profiles between T1 and T2 treatments were discriminated. Analysis results indicated direct interaction of water-soluble PM<sub>10</sub> metal forms with cellular components. In contrast, oxidizable and residual forms demonstrated intracellular biotransformation into more bioavailable states. In T1, a higher proportion of bioavailable metal forms (EtOH and H<sub>2</sub>O-extractable) was observed, correlating with enhanced organelle accumulation, indicative of a comparatively less robust detoxification capacity. Conversely, T2 shifted to less bioavailable forms (HAc, HCl, and NaCl extractable), reducing organelle uptake. While antioxidant enzyme activity increased in both, growth and andrographolide content decreased. This research provides novel insights into plant adaptive strategies against atmospheric metal stress under varying soil conditions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Characterization of PM10-bound metal speciation, bioavailability, and plant responses in Andrographis paniculata at a traffic junction

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年11月19日

查看全文
  • Sweta Yadav,
  • Puja Khare

摘要

Understanding the intricate fate of atmospheric particulate matter (PM10)-associated heavy metals within medicinal plants is crucial for environmental and public health. This study rigorously investigated the speciation, bioavailability, and cellular-physiological impacts of PM10-borne lead (Pb), cadmium (Cd), and arsenic (As) on Andrographis paniculata, tracing their dynamics across soil and plant tissues. The experiment was conducted near a busy traffic junction, comparing uncontaminated (T1) and metal-contaminated (T2) soils. PM10-Pb was predominantly (76%) in the residual fraction, whereas Cd was largely (66.5%) in the oxidizable fraction. As concentrations were too low for detailed PM10 fractionation. In A. paniculata, Pb exhibited higher accumulation but lower mobility than Cd. PM deposition induced significant leaf surface roughening, aggregate formation at trichomes, and altered stomatal morphology. The multivariate analysis delineated the dynamic relationship between PM10-associated metal speciation and their subsequent subcellular sequestration. Also, the distinct metal sequestration profiles between T1 and T2 treatments were discriminated. Analysis results indicated direct interaction of water-soluble PM10 metal forms with cellular components. In contrast, oxidizable and residual forms demonstrated intracellular biotransformation into more bioavailable states. In T1, a higher proportion of bioavailable metal forms (EtOH and H2O-extractable) was observed, correlating with enhanced organelle accumulation, indicative of a comparatively less robust detoxification capacity. Conversely, T2 shifted to less bioavailable forms (HAc, HCl, and NaCl extractable), reducing organelle uptake. While antioxidant enzyme activity increased in both, growth and andrographolide content decreased. This research provides novel insights into plant adaptive strategies against atmospheric metal stress under varying soil conditions.