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<p>Most tropical forests show a low phosphorus (P) concentration in the soil, which limits plant growth and development. Phosphate transporters and regulatory elements, including transcription factors, are involved in the uptake and transport of P from the soil into root cells and other plant organs, and responses to plant P status. To better understand the mechanisms of the root-leaf signalling and remobilisation response to P supply, we applied the split-root technique on two-month-old seedlings of three eucalypt species: <i>Eucalypts grandis</i>, <i>E. globulus</i>, and <i>E. tereticornis</i>. The P treatments were: +P/+P, +P/-P, and -P/-P (+ P and–P indicate P supplementation and P depleted, respectively). P was supplied as 440 µM in the nutrient solution. Eucalypt plants were grown for six weeks and the expression of genes related to P uptake, transport, and utilization in roots and leaves were evaluated by RT-qPCR. The results show that P supply on one side of the root seemed to compensate for the lack of P on the other side in the + P/-P treatment, so the plant did not show a clear P stress response. P remobilization was likely to be the reason for this result. The results revealed significant variations in nutrient concentrations across treatments, with P availability notably impacting the concentrations of B and Cu in leaves. In the root system, variations in P influenced the uptake of other nutrients, such as potassium (K) and magnesium (Mg), in distinct ways among different species. Principal component analysis identified clear patterns of nutrient distribution across treatments and species. Genes related to the Phosphorus Starvation Response were mostly induced when plants were under low P availability, but the expression response was species-dependent. The results demonstrate a complex response of eucalyptus species to uneven P distribution in the root environment, influencing the expression of genes related to P absorption, transport, and metabolism. These findings offer valuable insights into the mechanisms plants employ to adapt to variations in P availability and have important implications for the nutritional management of forest species.</p>

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Phosphorus Uptake in Eucalypt Plants Under Split Root System

  • 期刊论文

  • 发表日期：

    2025年3月12日

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  • Luana Ferreira Torres,
  • Sara Adrián López de Andrade,
  • Paulo Mazzafera

摘要

Most tropical forests show a low phosphorus (P) concentration in the soil, which limits plant growth and development. Phosphate transporters and regulatory elements, including transcription factors, are involved in the uptake and transport of P from the soil into root cells and other plant organs, and responses to plant P status. To better understand the mechanisms of the root-leaf signalling and remobilisation response to P supply, we applied the split-root technique on two-month-old seedlings of three eucalypt species: Eucalypts grandis, E. globulus, and E. tereticornis. The P treatments were: +P/+P, +P/-P, and -P/-P (+ P and–P indicate P supplementation and P depleted, respectively). P was supplied as 440 µM in the nutrient solution. Eucalypt plants were grown for six weeks and the expression of genes related to P uptake, transport, and utilization in roots and leaves were evaluated by RT-qPCR. The results show that P supply on one side of the root seemed to compensate for the lack of P on the other side in the + P/-P treatment, so the plant did not show a clear P stress response. P remobilization was likely to be the reason for this result. The results revealed significant variations in nutrient concentrations across treatments, with P availability notably impacting the concentrations of B and Cu in leaves. In the root system, variations in P influenced the uptake of other nutrients, such as potassium (K) and magnesium (Mg), in distinct ways among different species. Principal component analysis identified clear patterns of nutrient distribution across treatments and species. Genes related to the Phosphorus Starvation Response were mostly induced when plants were under low P availability, but the expression response was species-dependent. The results demonstrate a complex response of eucalyptus species to uneven P distribution in the root environment, influencing the expression of genes related to P absorption, transport, and metabolism. These findings offer valuable insights into the mechanisms plants employ to adapt to variations in P availability and have important implications for the nutritional management of forest species.