Southern Cross Plant Science, Faculty of Science and Engineering, Southern Cross University, Lismore, NSW, Australia.
PLoS One. 2023 Aug 15;18(8):e0288547. doi: 10.1371/journal.pone.0288547. eCollection 2023.
Saline agriculture may contribute to food production in the face of the declining availability of fresh water and an expanding area of salinized soils worldwide. However, there is currently little known about the biomass and nutrient/antinutrient accumulation response of many edible halophytes to increasing levels of salinity and nitrogen source. To address this, two glass house experiments were carried out. The first to study the shoot biomass, and nutrient accumulation response, measured by ICP-MS analysis, of edible halophyte species, including Mesembryanthemum crystallinum (ice plant), Salsola komarovii (Land seaweed), Enchylaena tomentosa (Ruby Saltbush), Crithmum maritimum (Rock Samphire), Crambe maritima (Sea Kale) and Mertensia maritima (Oyster Plant), under increasing levels of salinity (0 to 800 mM). The second experiment studied the effects of nitrogen source combined with salinity, on levels of oxalate, measured by HPLC, in ice plant and ruby saltbush. Species differences for biomass and sodium (Na), potassium (K), chloride (Cl), nitrogen (N) and phosphorus (P) accumulation were observed across the range of salt treatments (0 to 800mM). Shoot concentrations of the anti-nutrient oxalate decreased significantly in ice plant and ruby saltbush with an increase in the proportion of N provided as NH4+ (up to 100%), while shoot oxalate concentrations in ice plant and ruby saltbush grown in the absence of NaCl were not significantly different to oxalate concentrations in plants treated with 200 mM or 400 mM NaCl. However, the lower shoot oxalate concentrations observed with the increase in NH4+ came with concurrent reductions in shoot biomass. Results suggest that there will need to be a calculated tradeoff between oxalate levels and biomass when growing these plants for commercial purposes.
盐水农业可能有助于在淡水资源日益减少和全球盐渍土壤面积不断扩大的情况下生产粮食。然而，目前人们对许多可食用盐生植物对不断增加的盐度和氮源水平的生物量和营养/抗营养物质积累反应知之甚少。为了解决这个问题，进行了两项温室实验。第一项研究了包括冰菜（Mesembryanthemum crystallinum）、盐角草（Salsola komarovii）、绒毛盐蓬（Enchylaena tomentosa）、滨藜（Crithmum maritimum）、海甘蓝（Crambe maritima）和海蓬子（Mertensia maritima）在内的可食用盐生植物的地上生物量和通过 ICP-MS 分析测量的养分积累反应，这些植物在不断增加的盐度（0 到 800mM）下。第二项实验研究了氮源与盐度结合对冰菜和红宝石盐蓬中草酸水平的影响，通过 HPLC 测量。在盐处理（0 到 800mM）范围内观察到生物量和钠（Na）、钾（K）、氯（Cl）、氮（N）和磷（P）积累的物种差异。随着提供的氮作为 NH4+（高达 100%）的比例增加，冰菜和红宝石盐蓬中的抗营养草酸的地上浓度显著降低，而在没有 NaCl 的情况下生长的冰菜和红宝石盐蓬中的地上草酸浓度与用 200mM 或 400mM NaCl 处理的植物中的草酸浓度没有显著差异。然而，随着 NH4+的增加观察到的较低地上草酸浓度伴随着地上生物量的同时减少。结果表明，在为商业目的种植这些植物时，需要在草酸水平和生物量之间进行权衡。
