Scholarlink

<p>Copper (Cu) is an essential micronutrient for the normal functioning of the photosynthetic machinery in higher plants. It acts as a cofactor for numerous enzymes linked to photosynthesis, cellular respiration, elimination of reactive oxygen species and cell wall metabolism. 24-epibrassinolide (EBR) is a natural plant growth regulator that stimulates cellular metabolism, promotes increased biomass, enhances physiological processes, improves nutritional status, and mitigates several abiotic stresses. Our research aimed to verify the possible protective contributions of EBR in soybean plants cultivated under Cu stress (deficiency or excess) on growth, nutritional contents, photosynthesis and antioxidant metabolism.&#xa0;The research was carried out in a completely randomised design with two concentrations of EBR (0 and 100 nM, described as – EBR and + EBR, respectively) combined with three levels of Cu (0.0008, 0.8 and 800 µM, defined as low, control and high Cu content, respectively).&#xa0;The results demonstrated that EBR application improved the photosynthesis of plants under inadequate Cu supplies (deficiency and toxicity). Plants treated with EBR and exposed to Cu deficiency presented increments in antioxidant enzymes, more specifically superoxide dismutase (100%), catalase (7%), ascorbate peroxidase (13%) and peroxidase (45%), if compared with equal treatment without EBR.&#xa0;EBR alleviated the harmful interference caused by Cu on photosynthetic machinery, also improving the electron transport and redox metabolism. Therefore, our results validate the positive influence of EBR on Cu deficiency and toxicity in soybean plants.</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

Exogenous 24-Epibrassinolide Upregulated Photosynthesis in Soybean Plants Under Copper Stress as Evidenced by Electron Transport and Antioxidant Enzymes

  • 期刊论文

  • 发表日期：

    2025年11月11日

查看全文
  • Flávia Raphaela Carvalho Miranda Guedes,
  • Lucilene Santos Rodrigues,
  • Elaine Maria Silva Guedes Lobato,
  • Bruno Lemos Batista,
  • Allan Klynger da Silva Lobato

摘要

Copper (Cu) is an essential micronutrient for the normal functioning of the photosynthetic machinery in higher plants. It acts as a cofactor for numerous enzymes linked to photosynthesis, cellular respiration, elimination of reactive oxygen species and cell wall metabolism. 24-epibrassinolide (EBR) is a natural plant growth regulator that stimulates cellular metabolism, promotes increased biomass, enhances physiological processes, improves nutritional status, and mitigates several abiotic stresses. Our research aimed to verify the possible protective contributions of EBR in soybean plants cultivated under Cu stress (deficiency or excess) on growth, nutritional contents, photosynthesis and antioxidant metabolism. The research was carried out in a completely randomised design with two concentrations of EBR (0 and 100 nM, described as – EBR and + EBR, respectively) combined with three levels of Cu (0.0008, 0.8 and 800 µM, defined as low, control and high Cu content, respectively). The results demonstrated that EBR application improved the photosynthesis of plants under inadequate Cu supplies (deficiency and toxicity). Plants treated with EBR and exposed to Cu deficiency presented increments in antioxidant enzymes, more specifically superoxide dismutase (100%), catalase (7%), ascorbate peroxidase (13%) and peroxidase (45%), if compared with equal treatment without EBR. EBR alleviated the harmful interference caused by Cu on photosynthetic machinery, also improving the electron transport and redox metabolism. Therefore, our results validate the positive influence of EBR on Cu deficiency and toxicity in soybean plants.