Recently, biomass crops attracted considerable attention as a possible alternative to fossil fuels; nevertheless, the interest in its agronomic practices such as irrigation and fertilization is still unclear. This study aims at determining the appropriate phosphorus (P) fertilization management in the early development stage of giant reed (Arundo donax L.). The uptake, transportation, and fertilization use efficiency of P were reported in three ecotypes of giant reed, i.e., STM (Hungary), BL (the USA), and ESP (Spain). Somatic embryo-derived plantlets were developed under glasshouse environment in clean sand (quartz) augmented with 0, 25, 50, 100, and 150 mg P kg⁻¹, added as monosodium phosphate. P-treated plants possessed a fibrous root system characterized by many lateral roots, while control plants (received no P) had a root system distinguished with long axial roots with very few lateral branches. Phosphorus uptake significantly varied according to plant ecotype, plant parts, and applied P concentration. Giant reed ecotypes showed different responses to uptake and accumulation of P, where P contents in the STM, ESP and BL ecotypes were 392, 413, and 445 μg g⁻¹, respectively. The accumulation of P in different plant parts was as follows: leaf blade > culm > root. The treatment of 50 mg P kg⁻¹ displayed the highest P content in all plant parts. The BL and STM ecotypes showed the same translocation factor (TF) of 4.96, while the ESP ecotype exhibited a lower TF of (4.03). The treatment of 50 mg P kg⁻¹ revealed the highest TF (5.94). The BL ecotype showed P use efficiency (PUE) of 7.08 compared with 6.49 and 5.85 for the ESP and STM ecotypes, respectively. The 50 mg P kg⁻¹ exhibited the highest PUE (13.37). The BL ecotype displayed the highest CO₂ assimilation rate (12.46 μmol photons m⁻² s⁻¹). Also, the rate of CO₂ assimilation increased upon increasing the rate of the applied P. Our results reveal that the appropriate P fertilization rate of the ESP, STM, and BL ecotypes is 25, 25, and 50 mg P kg⁻¹, respectively.

最近，生物质作物作为化石燃料的可能替代品引起了广泛关注；然而，对其灌溉和施肥等农艺措施的兴趣仍不明朗。本研究旨在确定芦苇 ( Arundo donax L.) 早期发育阶段适宜的磷 (P) 施肥管理。在芦苇的三种生态型，即 STM（匈牙利）、BL（美国）和 ESP（西班牙）中报道了 P 的吸收、运输和施肥利用效率。体细胞胚衍生的小植株在温室环境下在干净的沙子（石英）中发育，增加了 0、25、50、100 和 150 mg P kg ^-1, 添加为磷酸一钠。P 处理的植物具有以许多侧根为特征的纤维状根系，而对照植物（未接受 P）的根系以长轴根和很少的侧枝为特征。磷的吸收因植物生态型、植物部位​​和施磷浓度的不同而有显着差异。芦苇生态型对磷的吸收和积累表现出不同的反应，其中 STM、ESP 和 BL 生态型中的磷含量分别为 392、413 和 445 μg g ^-1。植物各部位对磷的积累为：叶片＞茎＞根。^{50 mg P kg −1}的处理在所有植物部分中显示出最高的 P 含量。BL 和 STM 生态型显示相同的易位因子 (TF) 为 4.96，而 ESP 生态型显示较低的 TF (4.03)。^{50 mg P kg -1}的处理揭示了最高的 TF (5.94)。BL 生态型的磷利用效率 (PUE) 为 7.08，而 ESP 和 STM 生态型分别为 6.49 和 5.85。50 mg P kg ⁻¹表现出最高的 PUE (13.37)。BL 生态型显示出最高的CO ₂同化率（12.46 μmol 光子m ^-2 s ^-1）。_{此外，CO 2}的速率随着施磷量的增加，同化作用增加。我们的结果表明，ESP、STM 和 BL 生态型的适当施磷量分别为 25、25 和 50 mg P kg ^-1。