School of Public Administration, Hohai University, Nanjing, 210098, China.
Institute of Soil & Environmental Sciences, University of Agriculture, Faisalabad, 38000, Pakistan.
Environ Pollut. 2022 Oct 15;311:119977. doi: 10.1016/j.envpol.2022.119977. Epub 2022 Aug 17.
Both cadmium (Cd) toxicity and water limited stress in crop plants are serious concerns worldwide while little is known about the impact of various phosphorus (P) sources on Cd accumulation in cereals especially under water limited stress. A study was conducted to explore the efficiency of three frequently available P fertilizers on Cd accumulation in wheat under different soil moisture levels. Three different P sources including diammonium phosphate (DAP), single super phosphate (SSP), and nitrophos (NP) were applied in the soil with three levels (0, 50 and 100 mg/kg). The drought stress was applied to half treatments during the latter growth stages of wheat and plants were harvested at maturity. The results demonstrated that water-limited stress decreased the growth and yield of plants than respective treatments without water stress. P supply increased the growth of wheat irrespective of water-limited stress. The effect on growth and yield varied with the sources and levels of P and maximum effects was observed in DAP treatment (100 mg/kg). The P amendments enhanced the leaf photosynthesis and activities of SOD, POD, CAT and decreased the leaf oxidative burst. Water limited stress enhanced the Cd concentrations in shoots, roots, and grains whereas P amendments minimized the Cd concentrations and enhanced the P concentrations in these parts of plants. The results obtained demonstrated that P supply in the form of DAP might be effective in minimization of Cd in grains and can be used for safe cultivation of metal-contaminated soils.
在全球范围内，镉（Cd）毒性和水分限制胁迫都是作物面临的严重问题，而对于不同磷（P）源在水分限制胁迫下对谷类作物中 Cd 积累的影响知之甚少。本研究旨在探讨三种常用磷肥在不同土壤水分水平下对小麦 Cd 积累的效率。在土壤中施加三种不同的磷源，包括磷酸二铵（DAP）、过磷酸钙（SSP）和硝磷（NP），并设置三个水平（0、50 和 100mg/kg）。在小麦生长后期对一半处理进行干旱胁迫，并在成熟时收获植物。结果表明，水分限制胁迫会降低植物的生长和产量，而水分不受限制的处理则不会。磷供应增加了小麦的生长，无论是否存在水分限制胁迫。磷源和水平的变化对生长和产量的影响不同，DAP 处理（100mg/kg）的效果最佳。磷处理增强了叶片光合作用和 SOD、POD、CAT 的活性，降低了叶片氧化爆发。水分限制胁迫增加了地上部分、根系和籽粒中的 Cd 浓度，而磷处理则降低了这些部位的 Cd 浓度并提高了 P 浓度。研究结果表明，以 DAP 形式提供的磷可能有助于减少籽粒中的 Cd，并可用于安全种植受金属污染的土壤。
