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<p>Cadmium is a hazardous heavy metal. Excessive accumulation of Cd in plants results in stunted development and diminished yield. Significant advancements have been achieved regarding the function of microalgae in seawater, saline-alkali and drought stress. However, there is little research on the regulation of Cd tolerance by microalgae in plants. This study demonstrated that microalgae (<i>Nitzschia palea</i>) treatment significantly enhances seed germination, seedling development, and the production and quality of cucumber fruits under Cd stress. Furthermore, <i>N. palea</i> treatment facilitated the accumulation of mineral components in fruits and markedly diminished the Cd levels in roots and fruits. <i>Nitzschia palea</i> treatment enhanced plant tolerance to Cd stress by reducing the levels of reactive oxygen species (ROS) and malondialdehyde (MDA) while augmenting the activity of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), and ascorbate peroxidase (APX). RNA-sequencing analysis revealed that <i>N. palea</i> treatment enhances cucumber growth under Cd stress by modulating the expression of genes associated with cell detoxification, oxidoreductase activities, hormones, photosynthesis, and transcription factors. Our research clarifies the function of microalgae in enhancing Cd tolerance in cucumbers, offering a valuable reference for augmenting crops quality and output and environmental remediation.</p>

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Microalgae (Nitzschia palea) improved cucumber growth and fruits quality through cadmium stress alleviation

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Yexi Gao,
  • Yuqi Wu,
  • Geli Wang,
  • Jing Guo,
  • Yufang Ma,
  • Yanlong Dong,
  • Chao Chen,
  • Xiaoxia Jin

摘要

Cadmium is a hazardous heavy metal. Excessive accumulation of Cd in plants results in stunted development and diminished yield. Significant advancements have been achieved regarding the function of microalgae in seawater, saline-alkali and drought stress. However, there is little research on the regulation of Cd tolerance by microalgae in plants. This study demonstrated that microalgae (Nitzschia palea) treatment significantly enhances seed germination, seedling development, and the production and quality of cucumber fruits under Cd stress. Furthermore, N. palea treatment facilitated the accumulation of mineral components in fruits and markedly diminished the Cd levels in roots and fruits. Nitzschia palea treatment enhanced plant tolerance to Cd stress by reducing the levels of reactive oxygen species (ROS) and malondialdehyde (MDA) while augmenting the activity of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), and ascorbate peroxidase (APX). RNA-sequencing analysis revealed that N. palea treatment enhances cucumber growth under Cd stress by modulating the expression of genes associated with cell detoxification, oxidoreductase activities, hormones, photosynthesis, and transcription factors. Our research clarifies the function of microalgae in enhancing Cd tolerance in cucumbers, offering a valuable reference for augmenting crops quality and output and environmental remediation.