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<p>Zinc (Zn) is an essential nutrient for plant growth and function. However, excess concentration of Zn damages plant growth, development, and metabolism. To get more insight into Zn toxicity and the role of putrescine (Put) in alleviating of the negative impact of Zn, canola (<i>Brassica napus</i> L.) was exposed to 10 µM Zn with and without 0.2 mM Put. The Zn toxicity led to a decrease in biomass production by 70 and 63% in shoots and roots, respectively. Similarly, the content of chlorophyll a and b was reduced by 30 and 23%, respectively. Likewise, relative expression of nitrate transporters (<i>NRT2.1</i> and <i>NRT1.5</i>), nitrate reductase (<i>NR</i>), and glutamine synthase (<i>GS2</i>) were decreased upon exposure to Zn, which was accompanied by a decrease in the content of nitrate and total nitrogen in shoots and roots. Put alleviated Zn toxicity probably by the decrease in the content of Zn by 20 and 40% in shoots and roots, respectively. Indeed, Put improved plant growth as well as pigments and protein biosynthesis under Zn toxicity. The transcript levels of <i>NRT2.1</i>, <i>NRT1.5</i>,<i> NR</i>, <i>GS2</i>, and transcription factor NIN-LIKE PROTEIN 7 (<i>NLP7</i>) in plants exposed to Zn were increased upon treatment with Put. This could result in an increase in the content of total nitrogen by 2- and 1.5-fold in shoots and roots, respectively. While exogenously applied, Put reduced the content of ammonium and proline in Zn-stressed plants. Indeed, Put improved nitrogen uptake and assimilation in canola exposed to the toxic level of Zn.</p>

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Putrescine Improves Growth and Modulates Nitrogen Metabolism in Brassica napus L. Under Zinc Toxicity

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • Tahereh A. Aghajanzadeh,
  • Amirreza Shahkouhi,
  • Omid Jazayeri

摘要

Zinc (Zn) is an essential nutrient for plant growth and function. However, excess concentration of Zn damages plant growth, development, and metabolism. To get more insight into Zn toxicity and the role of putrescine (Put) in alleviating of the negative impact of Zn, canola (Brassica napus L.) was exposed to 10 µM Zn with and without 0.2 mM Put. The Zn toxicity led to a decrease in biomass production by 70 and 63% in shoots and roots, respectively. Similarly, the content of chlorophyll a and b was reduced by 30 and 23%, respectively. Likewise, relative expression of nitrate transporters (NRT2.1 and NRT1.5), nitrate reductase (NR), and glutamine synthase (GS2) were decreased upon exposure to Zn, which was accompanied by a decrease in the content of nitrate and total nitrogen in shoots and roots. Put alleviated Zn toxicity probably by the decrease in the content of Zn by 20 and 40% in shoots and roots, respectively. Indeed, Put improved plant growth as well as pigments and protein biosynthesis under Zn toxicity. The transcript levels of NRT2.1, NRT1.5, NR, GS2, and transcription factor NIN-LIKE PROTEIN 7 (NLP7) in plants exposed to Zn were increased upon treatment with Put. This could result in an increase in the content of total nitrogen by 2- and 1.5-fold in shoots and roots, respectively. While exogenously applied, Put reduced the content of ammonium and proline in Zn-stressed plants. Indeed, Put improved nitrogen uptake and assimilation in canola exposed to the toxic level of Zn.