Uncoupling growth from phosphorus uptake in Lemna: Implications for use of duckweed in wastewater remediation and P recovery in temperate climates,Food and Energy Security

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Uncoupling growth from phosphorus uptake in Lemna: Implications for use of duckweed in wastewater remediation and P recovery in temperate climates
Food and Energy Security ( IF 4.0 ) Pub Date : 2020-08-30 , DOI: 10.1002/fes3.244
Jaimie B Paterson _{1,

2,

3} , Miller Alonso Camargo-Valero _{2,

4} , Alison Baker ₁

Affiliation

Phosphorus (P) is an essential nutrient for crop growth and the second most limiting after N. Current supplies rely on P‐rich rocks that are unevenly distributed globally and exploited unsustainably, leading to concerns about future availability and therefore food security. Duckweeds (Lemnaceae) are aquatic macrophytes used in wastewater remediation with the potential for nutrient recycling as feed or fertilizer. The use of duckweeds in this way is confined to tropical regions as it has previously been assumed that growth in the colder seasons of the temperate regions would be insufficient. In this study, the combined effects of cool temperatures and short photoperiods on growth and P uptake and accumulation in Lemna were investigated under controlled laboratory conditions. Growth and P accumulation in Lemna can be uncoupled, with significant P removal from the medium and accumulation within the plants occurring even at 8°C and 6‐hr photoperiods. Direct measurement of radiolabeled phosphate uptake confirmed that while transport is strongly temperature dependent, uptake can still be measured at 5°C. Prior phosphate starvation of the duckweed and use of nitrate as the nitrogen (N) source also greatly increased the rate of P removal and in‐cell accumulation. These results form the basis for further examination of the feasibility of duckweed‐based systems for wastewater treatment and P recapture in temperate climates, particularly in small, rural treatment works.

中文翻译：

浮萍生长与磷吸收的脱钩：在温带气候中使用浮萍进行废水修复和磷回收的影响

磷 (P) 是农作物生长的必需养分，也是仅次于氮的第二大限制性养分。目前的供应依赖于富含磷的岩石，这些岩石在全球分布不均且不可持续地开采，导致人们对未来的供应量和粮食安全产生担忧。浮萍（浮萍科）是用于废水修复的水生大型植物，具有作为饲料或肥料进行养分回收的潜力。以这种方式使用浮萍仅限于热带地区，因为以前认为浮萍在温带地区较冷的季节生长不足。在这项研究中，在受控的实验室条件下研究了低温和短光周期对浮萍生长以及磷吸收和积累的综合影响。浮萍中的生长和磷积累可以是不耦合的，即使在 8°C 和 6 小时光周期下，也会从培养基中大量去除磷并在植物内积累。放射性标记磷酸盐摄取的直接测量证实，虽然运输强烈依赖于温度，但摄取仍然可以在 5°C 下测量。浮萍之前的磷酸盐饥饿和使用硝酸盐作为氮源也大大提高了磷的去除率和细胞内积累的速度。这些结果为进一步检验温带气候下基于浮萍的废水处理和预回收系统的可行性奠定了基础，特别是在小型农村处理厂中。

更新日期：2020-08-30

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