Abstract：
Tomato (Solanum lycopersicum) seedlings were exposed by foliar or root applications to Zn in different nanoscale and non-nanoscale forms (40 mg Zn/L) under hydroponic conditions for 15 days. Under foliar exposure, ZnO QDs significantly promoted tomato growth, while ZnO NPs and BPs had lower impacts. ZnO QDs increased fresh weight and plant height by 42.02 % and 21.10 % relative to the untreated controls, respectively. The ionic control (ZnSO4·7H2O, 176.6 mg/L) decreased fresh weight by 39.31 %. ZnO QDs also significantly increased the Chla/Chlb ratio, as well as carotenoids and protein content by 7.70 %, 8.90 % and 26.33 %, respectively, over the untreated controls, suggesting improvement in seedling photosynthetic performance. Antioxidant enzyme (POD, PPO and PAL) activities in ZnO QDs treated shoots were significantly decreased by 31.1 %, 17.8 % and 48.3 %, respectively, indicating no overt oxidative damage from exposure. Importantly, the translocation factor of Zn (TFZn) in the foliar exposure of the ZnO QDs treatment was 73.2 %, 97.1 % and 276.9 % greater than the NPs, BPs, and ionic controls, respectively. Overall, these findings clearly demonstrate that foliar spray of nanoscale nutrients at the appropriate concentration and size can significantly increase crop growth and be a sustainable approach to nano-enabled agriculture.
摘要：
在水培条件下，通过叶面或根部施用不同纳米级和非纳米级形式（40mgZn/L）的Zn，使番茄（Solanumlycopersum）幼苗暴露15天。在叶面照射下，ZnO量子点显著促进番茄生长,而ZnONPs和BPs的影响较低。相对于未处理的对照，ZnOQDs使鲜重和株高增加了42.02%和21.10%，分别。离子控制(ZnSO4·7H2O，176.6mg/L）使鲜重降低39.31％。ZnO量子点也显著增加了Chla/Chlb比，以及类胡萝卜素和蛋白质含量下降了7.70%，8.90%和26.33%，分别,在未经治疗的对照中，表明幼苗光合性能的改善。抗氧化酶（POD，ZnO量子点处理的芽中的PPO和PAL）活性显着降低了31.1％，17.8%和48.3%,分别,表明暴露没有明显的氧化损伤。重要的是,在ZnOQDs处理的叶面暴露中Zn的移位因子(TFZn)为73.2%,比NP高出97.1%和276.9%，BP,和离子控制，分别。总的来说,这些发现清楚地表明，以适当的浓度和大小叶面喷洒纳米级养分可以显着提高作物的生长，是一种可持续的纳米农业方法。
