Scholarlink

<p><i>Raphidiopsis raciborskii</i> is recognized as a highly invasive cyanobacterium, with increasing reports of its prevalence. Pesticides and heavy metals represent two significant categories of pollutants contributing to water contamination. To investigate the invasion characteristics of cyanobacteria in polluted waters, chlorophyll fluorescence kinetics revealed that high-concentration exposure reduced key fluorescence transient points—O (initial), J and I (intermediate), and P (peak) —compared to the control, whereas the P level was elevated under low-concentration exposure. <i>F</i><sub>v</sub>/<i>F</i><sub>o</sub> and PI<sub>ABS</sub> values rose notably with low cadmium (Cd) exposure but declined with high Cd and high-concentration co-exposure. Values were lower in high-concentration co-exposure than low single Cd exposure, yet higher than high-concentration single Cd exposure. Photosynthetic parameters exhibited an increase at low Cd concentrations but demonstrated a notable decrease at high Cd and combined Cd exposure. Low concentration combined exposure significantly enhanced superoxide dismutase (SOD) and catalase (CAT) activities, with no significant change observed in malondialdehyde (MDA) content. In contrast, high concentration combined exposure resulted in decreased SOD and CAT activities, a significant increase in MDA content, and reduced glutathione (GSH) levels across the exposure groups. Microstructural and ultrastructural alterations indicate oxidative stress. Transcriptome analysis revealed that high co-exposure down-regulated key photosynthetic genes, and the presence of glyphosate (Gly) mitigated Cd toxicity during co-exposure. These findings contribute to a deeper understanding of the adaptive mechanisms of invasive cyanobacteria to pesticides and heavy metals, providing theoretical support for the management of invasive cyanobacterial species.</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

Comprehensive physiological-biochemical and transcriptome studies revealed the adaptive mechanism of invasive cyanobacteria, Raphidiopsis raciborskii, to glyphosate and cadmium single and combined toxicity

  • 期刊论文

  • 发表日期：

    2026年7月25日

查看全文
  • Yisifu Ma,
  • Xue Wang,
  • Jiale Zhang,
  • Shinichi Nakano,
  • Junguo Ma,
  • Yang Liu

摘要

Raphidiopsis raciborskii is recognized as a highly invasive cyanobacterium, with increasing reports of its prevalence. Pesticides and heavy metals represent two significant categories of pollutants contributing to water contamination. To investigate the invasion characteristics of cyanobacteria in polluted waters, chlorophyll fluorescence kinetics revealed that high-concentration exposure reduced key fluorescence transient points—O (initial), J and I (intermediate), and P (peak) —compared to the control, whereas the P level was elevated under low-concentration exposure. Fv/Fo and PIABS values rose notably with low cadmium (Cd) exposure but declined with high Cd and high-concentration co-exposure. Values were lower in high-concentration co-exposure than low single Cd exposure, yet higher than high-concentration single Cd exposure. Photosynthetic parameters exhibited an increase at low Cd concentrations but demonstrated a notable decrease at high Cd and combined Cd exposure. Low concentration combined exposure significantly enhanced superoxide dismutase (SOD) and catalase (CAT) activities, with no significant change observed in malondialdehyde (MDA) content. In contrast, high concentration combined exposure resulted in decreased SOD and CAT activities, a significant increase in MDA content, and reduced glutathione (GSH) levels across the exposure groups. Microstructural and ultrastructural alterations indicate oxidative stress. Transcriptome analysis revealed that high co-exposure down-regulated key photosynthetic genes, and the presence of glyphosate (Gly) mitigated Cd toxicity during co-exposure. These findings contribute to a deeper understanding of the adaptive mechanisms of invasive cyanobacteria to pesticides and heavy metals, providing theoretical support for the management of invasive cyanobacterial species.