Abstract：
Drought priming is known to enhance plant low temperature tolerance, whereas polystyrene nanoplastic contamination exerts detrimental effects on plant growth. This study investigates the less-explored influence of nanoplastic contamination on cold stress tolerance in drought-primed plants. We compared the photosynthetic carbon assimilation, carbohydrate metabolism, reactive oxygen species metabolism, and grain yield between the non-primed and drought-primed wheat grown in both nanoplastic-contaminated and healthy soils. Our results reveal that the beneficial effects of drought priming on photosynthetic carbon assimilation and the efficiency of the \"water-water\" cycle were compromised in the presence of nanoplastics (nPS). Additionally, nPS exposure disturbed carbohydrate metabolism, which impeded source-to-sink transport of sugar and resulted in reduced grain yield in drought-primed plants under low temperature conditions. These findings unveil the suppression of nPS on drought-primed low-temperature tolerance (DPLT) in wheat plants, suggesting an intricate interplay between the induction of stress tolerance and responses to nPS contamination. The study raises awareness about a potential challenge for future crop production.
摘要：
众所周知，干旱引发可以增强植物的耐低温能力，而聚苯乙烯纳米塑料污染对植物生长产生有害影响。这项研究调查了纳米塑料污染对干旱植物耐冷胁迫能力的影响。我们比较了光合碳同化，碳水化合物代谢，活性氧代谢，在纳米塑料污染的土壤和健康的土壤中生长的未引发和干旱引发的小麦之间的谷物产量。我们的结果表明，在纳米塑料（nPS）的存在下，干旱引发对光合碳同化和“水-水”循环效率的有益影响受到了损害。此外,nPS暴露会干扰碳水化合物代谢，这阻碍了糖的源到汇运输，并导致低温条件下干旱植物的谷物产量降低。这些发现揭示了nPS对小麦植株干旱引发的低温耐受性（DPLT）的抑制作用，表明胁迫耐受性的诱导和对nPS污染的反应之间存在复杂的相互作用。这项研究提高了人们对未来作物生产的潜在挑战的认识。
