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<p>Using high concentrations of copper (Cu) to control root entanglement of containerized seedlings can lead to excessive Cu accumulation in roots, which would change root architecture and affect other mineral nutrient uptake and accumulation within/between organs. Here, we investigated the growth, root architecture based on root order and root diameter, and absorptive and transport functions of roots in <i>Ligustrum lucidum</i> seedlings after transplanting that were ever treated with 100&#xa0;g L<sup>− 1</sup> Cu(OH)<sub>2</sub> in the nursery. The Cu-treated plants continued to maintain growth advantages, which were related to more absorptive and transport roots. Control plants had five root orders and lacked roots &gt; 2.0&#xa0;mm in diameter, whereas Cu-treated plants had eight root orders, roots with a diameter of 2.0–3.5&#xa0;mm, and more first-order roots and the finest roots. The Cu concentration in roots, stems, and leaves of Cu-treated plants was 11.8, 3.2, and 2.3 times higher than that of the control plants before transplanting, while no significant differences in Cu concentration between treatment and control were observed after transplanting. In addition, the concentrations of magnesium, manganese, iron, and potassium in leaves in treatment and control were maintained at similar levels after transplanting. Excessive Cu deposition in roots effectively prevented Cu translocation toward shoots, and the restoration of Cu to normal concentration in vegetative organs after transplanting facilitated Cu homeostasis and rebalanced nutritional relationship.</p>

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Root architecture and nutritional status of copper-pruned container-grown Ligustrum lucidum seedlings after transplanting

  • 期刊论文

  • 发表日期：

    2025年4月9日

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  • Yumei Zhou,
  • Ying Zhang,
  • Huan Chen,
  • Jingjing Jia,
  • Gelei Meng,
  • Shiyun Wu,
  • Ming Yang

摘要

Using high concentrations of copper (Cu) to control root entanglement of containerized seedlings can lead to excessive Cu accumulation in roots, which would change root architecture and affect other mineral nutrient uptake and accumulation within/between organs. Here, we investigated the growth, root architecture based on root order and root diameter, and absorptive and transport functions of roots in Ligustrum lucidum seedlings after transplanting that were ever treated with 100 g L− 1 Cu(OH)2 in the nursery. The Cu-treated plants continued to maintain growth advantages, which were related to more absorptive and transport roots. Control plants had five root orders and lacked roots > 2.0 mm in diameter, whereas Cu-treated plants had eight root orders, roots with a diameter of 2.0–3.5 mm, and more first-order roots and the finest roots. The Cu concentration in roots, stems, and leaves of Cu-treated plants was 11.8, 3.2, and 2.3 times higher than that of the control plants before transplanting, while no significant differences in Cu concentration between treatment and control were observed after transplanting. In addition, the concentrations of magnesium, manganese, iron, and potassium in leaves in treatment and control were maintained at similar levels after transplanting. Excessive Cu deposition in roots effectively prevented Cu translocation toward shoots, and the restoration of Cu to normal concentration in vegetative organs after transplanting facilitated Cu homeostasis and rebalanced nutritional relationship.