Department of Soil and Water Conservation and Organic Waste Management, CEBAS-CSIC, Campus Universitario de Espinardo, 30100, Murcia, Spain.
Department of Soil and Water Conservation and Organic Waste Management, CEBAS-CSIC, Campus Universitario de Espinardo, 30100, Murcia, Spain.
Plant Physiol Biochem. 2022 Sep 1;186:232-241. doi: 10.1016/j.plaphy.2022.07.013. Epub 2022 Jul 20.
Accumulation of noxious elements in the edible part of crops and its impact on food safety is of increasing concern. Rice is one of the major staple food crops worldwide, including arsenic (As)-polluted areas, in which dietary As exposure is becoming a widespread health threat. Plant chemical priming has been shown to be an effective strategy to enhance tolerance to environmental stresses, including metal(loid) exposure. The priming effect of ascorbic acid (AsA) was assessed in rice seedlings exposed to As(V) in a hydroponics experiment. AsA treatment (co-addition to the growing media concomitantly (t) or 24 h in advance (t)) prevented an excessive accumulation of As in the roots (that decreased ∼ 60%) and stimulated the activities of photosynthetic and antioxidant attributes (∼1.2-fold) in the aerial part of the plants. The increase in proline levels in both shoots (∼2.1-fold) and roots (∼2.4-fold) was found to be the most sensitive stress parameter, and was able to reflect the AsA-induced reduction of As toxic effects (concentrations back to Control levels, both simultaneously added or added as a pretreatment) in the aerial part of the plants. However, the phytotoxic effects related to As exposure were not fully prevented by priming with AsA, and further research is needed to find alternative priming approaches.
有毒元素在农作物可食用部分的积累及其对食品安全的影响越来越受到关注。水稻是世界上主要的粮食作物之一，包括砷（As）污染地区，在这些地区，膳食砷暴露正成为一种广泛存在的健康威胁。植物化学引发已被证明是一种增强对环境胁迫（包括金属（类）暴露）耐受性的有效策略。在水培实验中，评估了抗坏血酸（AsA）对水稻幼苗暴露于 As(V) 的引发效应。AsA 处理（同时（t）或提前 24 小时（t）添加到生长介质中）防止了根部过量积累 As（减少约 60%），并刺激了植物地上部分的光合作用和抗氧化特性的活性（增加约 1.2 倍）。发现脯氨酸水平在地上部分（增加约 2.1 倍）和根部（增加约 2.4 倍）的增加是最敏感的应激参数，并且能够反映 AsA 诱导的降低 As 毒性效应（浓度恢复到对照水平，同时添加或预处理添加）。然而，用 AsA 引发并不能完全防止与 As 暴露相关的植物毒性效应，需要进一步研究以寻找替代的引发方法。
