关于microRNAs(miRs)和转录因子在调节植物细胞对纳米颗粒的反应中的作用,已经进行了有限的研究。这项研究试图解决氧化锌纳米颗粒(ZnONPs;0、10、25和50mgL-1)的叶面施用是否会影响miRs,基因表达,和小麦籽粒质量。以72小时的间隔将幼苗用ZnONPs(0、10、25和50mgL-1)或散装对应物(BZnO)喷洒五次。以10mgL-1施用ZnONPs增加了小穗数和种子重量,而50mgL-1的纳米补充剂伴随着对发育的尖峰和谷物的严重限制。ZnONPs,以剂量依赖的方式,转录影响miR156和miR171。miR171的表达显示出与miR156相似的趋势。最佳浓度的ZnONPs在转录水平上上调NAM转录因子和蔗糖转运蛋白(SUT)。然而,NAM和SUT基因的转录均显示出响应于毒性剂量的ZnONPs(50mgL-1)的下降趋势。ZnONPs的利用增加了脯氨酸和总可溶性酚含量。监测碳水化合物的积累,包括果聚糖,葡萄糖,果糖,和蔗糖,揭示了10mgL-1的ZnONPs改变了源/汇通讯和养分再动员。分子和生理数据表明,miR156和miR171的表达与籽粒发育密切相关,碳水化合物的再动员,和参与营养运输的基因。这项研究建立了一种新的策略,以获得更高的作物产量。这项生物风险评估调查还显示了在开花发育阶段应用ZnONPs的潜在危害。
Limited studies have been conducted on the role of microRNAs (miRs) and
transcription factors in regulating plant cell responses to nanoparticles. This
study attempted to address whether the foliar application of zinc oxide nanoparticles (ZnONPs; 0, 10, 25, and 50 mgL-1) can affect miRs, gene expression, and wheat grain quality. The seedlings were sprayed with ZnONPs (0, 10, 25, and 50 mgL-1) or bulk counterpart (BZnO) five times at 72 h intervals. The application of ZnONPs at 10 mgL-1 increased the number of spikelets and seed weight, while the nano-supplement at 50 mgL-1 was accompanied by severe restriction on developing spikes and grains. ZnONPs, in a dose-dependent manner, transcriptionally influenced miR156 and miR171. The expression of miR171 showed a similar trend to that of miR156. The ZnONPs at optimum concentration upregulated the NAM
transcription factor and sucrose transporter (SUT) at transcriptional levels. However, the
transcription of both NAM and SUT genes displayed a downward trend in response to the toxic dose of ZnONPs (50 mgL-1). Utilization of ZnONPs increased proline and total soluble phenolic content. Monitoring the accumulation of carbohydrates, including fructan, glucose, fructose, and sucrose, revealed that ZnONPs at 10 mgL-1 modified the source/sink communication and nutrient remobilization. The molecular and physiological data revealed that the expression of miR156 and miR171 is tightly linked to seed grain development, remobilization of carbohydrates, and genes involved in nutrient transportation. This
study establishes a novel strategy for obtaining higher yields in crops. This biological risk assessment investigation also displays the potential hazard of applying ZnONPs at the flowering developmental phase.