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<p>Selenium (Se) supplementation is known to induce chromium (Cr) tolerance in different plant species. However, the physiological and molecular pathways through which Se affects Cr tolerance in rapeseed (<i>Brassica napus</i> L.) remain largely unknown. In the current research, a transcriptomic analysis was carried out to reveal the mechanism of action of Se supplementation (5&#xa0;μM) to confer tolerance to Cr stress (10&#xa0;μM) in rapeseed leaves. RNA-seq data revealed significant differential gene expression, with 2993 DEGs identified in the Cr treatment and 3400 DEGs in the Se + Cr treatment compared to the control. In addition, comparative transcriptome analysis revealed 464 differentially expressed genes (DEGs), including 316 up-regulated and 148 down-regulated, in response to Se supplementation under Cr stress. Gene ontology (GO) analysis identified key differentially expressed genes (DEGs) and their associated pathways, emphasizing the roles of defense mechanisms, hormonal signaling, transmembrane transport, and transcriptional regulation in Se-mediated responses to Cr stress. Collectively, these results demonstrate that Se significantly contributes to the attenuation of Cr-induced stress responses by regulating multiple molecular pathways, ultimately enhancing stress tolerance in rapeseed.</p>

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Transcriptomic analysis reveals ameliorative effects of exogenous selenium in Brassica napus L. seedlings exposed to chromium stress

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Hakan Terzi,
  • Mustafa Yıldız

摘要

Selenium (Se) supplementation is known to induce chromium (Cr) tolerance in different plant species. However, the physiological and molecular pathways through which Se affects Cr tolerance in rapeseed (Brassica napus L.) remain largely unknown. In the current research, a transcriptomic analysis was carried out to reveal the mechanism of action of Se supplementation (5 μM) to confer tolerance to Cr stress (10 μM) in rapeseed leaves. RNA-seq data revealed significant differential gene expression, with 2993 DEGs identified in the Cr treatment and 3400 DEGs in the Se + Cr treatment compared to the control. In addition, comparative transcriptome analysis revealed 464 differentially expressed genes (DEGs), including 316 up-regulated and 148 down-regulated, in response to Se supplementation under Cr stress. Gene ontology (GO) analysis identified key differentially expressed genes (DEGs) and their associated pathways, emphasizing the roles of defense mechanisms, hormonal signaling, transmembrane transport, and transcriptional regulation in Se-mediated responses to Cr stress. Collectively, these results demonstrate that Se significantly contributes to the attenuation of Cr-induced stress responses by regulating multiple molecular pathways, ultimately enhancing stress tolerance in rapeseed.