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<p>Selenium hyperaccumulator species are a vital biomass resource for humans taking in Se, with its selenate transport intricately linked to leaf intracellular nutrient characteristics. However, prior research has not explored dynamic electrophysiological intracellular nutrient parameters and selenium tolerance of selenium hyperaccumulator species. This study investigated the selenium hyperaccumulator <i>Cardamine violifolia</i> (<i>C. violifolia</i>) by evaluating its growth, photosynthetic capacity, leaf selenium transport-accumulation coefficients, and electrophysiological traits, including intracellular nutrient parameters, cellular metabolic energy, and B-type dielectric properties. The results revealed the dynamics of intracellular electrophysiological parameters under varying selenate levels and identified the optimal (S1, 50&#xa0;mg/L Se<sup>6+</sup>) and tolerable (S3, 150&#xa0;mg/L Se<sup>6+</sup>) selenate concentrations for <i>C. violifolia</i>. Compared to the control (CK), the S1 treatment significantly enhanced key physiological parameters in <i>C. violifolia</i>. Specifically, we observed increases ranging from 11.76% to 23.28% in the net photosynthetic rate (Pn), leaf intrinsic capacitance (LICp), leaf intracellular water-holding capacity (LIWHC), leaf water transfer rate (LWTR), leaf nutrient flux per unit area (LUNF), and leaf metabolic energy (ΔG<sub>L</sub>). This overall enhancement promoted the growth of the plant. In contrast, the S3 treatment led to significant declines of 18.04% to 39.80% in several key parameters, including LICp, LWTR, leaf nutrient absorption capacity (LNAC), leaf active transport flux of nutrients (LUAF), and ΔG<sub>L</sub>, reducing selenium transport of <i>C. violifolia</i>. Moreover, S3 suppressed growth by increasing the B-type dielectric constant, reflecting the intrinsic physiological resistance of <i>C. violifolia</i> leaves. Overall, plant electrophysiological methods provide dynamic parameters of intracellular nutrients in <i>C. violifolia</i> leaves under varying selenate levels. This approach offers a novel tool for assessing plant responses to selenium stress, thereby enabling safer regulation of selenium accumulation and transport.</p>

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Dynamic electrophysiological characterization of leaf intracellular nutrients in Cardamine violifolia under various selenate treatments

  • 期刊论文

  • 发表日期：

    2026年6月28日

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  • Jing Fan,
  • Yanyou Wu,
  • Gang Wang,
  • Dongshan Xiang,
  • Xiangyong Gu,
  • Xinjian Song,
  • Hanqing Meng,
  • Kun Zhai,
  • Antong Xia

摘要

Selenium hyperaccumulator species are a vital biomass resource for humans taking in Se, with its selenate transport intricately linked to leaf intracellular nutrient characteristics. However, prior research has not explored dynamic electrophysiological intracellular nutrient parameters and selenium tolerance of selenium hyperaccumulator species. This study investigated the selenium hyperaccumulator Cardamine violifolia (C. violifolia) by evaluating its growth, photosynthetic capacity, leaf selenium transport-accumulation coefficients, and electrophysiological traits, including intracellular nutrient parameters, cellular metabolic energy, and B-type dielectric properties. The results revealed the dynamics of intracellular electrophysiological parameters under varying selenate levels and identified the optimal (S1, 50 mg/L Se6+) and tolerable (S3, 150 mg/L Se6+) selenate concentrations for C. violifolia. Compared to the control (CK), the S1 treatment significantly enhanced key physiological parameters in C. violifolia. Specifically, we observed increases ranging from 11.76% to 23.28% in the net photosynthetic rate (Pn), leaf intrinsic capacitance (LICp), leaf intracellular water-holding capacity (LIWHC), leaf water transfer rate (LWTR), leaf nutrient flux per unit area (LUNF), and leaf metabolic energy (ΔGL). This overall enhancement promoted the growth of the plant. In contrast, the S3 treatment led to significant declines of 18.04% to 39.80% in several key parameters, including LICp, LWTR, leaf nutrient absorption capacity (LNAC), leaf active transport flux of nutrients (LUAF), and ΔGL, reducing selenium transport of C. violifolia. Moreover, S3 suppressed growth by increasing the B-type dielectric constant, reflecting the intrinsic physiological resistance of C. violifolia leaves. Overall, plant electrophysiological methods provide dynamic parameters of intracellular nutrients in C. violifolia leaves under varying selenate levels. This approach offers a novel tool for assessing plant responses to selenium stress, thereby enabling safer regulation of selenium accumulation and transport.