MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, The Center of Crop Nanobiotechnology, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China.
Hubei Hongshan Laboratory, Wuhan, 430070, China.
Adv Biol (Weinh). 2023 Jul;7(7):e2200317. doi: 10.1002/adbi.202200317. Epub 2023 Mar 22.
Poly (acrylic) acid coated Mn3O4 nanoparticles (PAA@Mn O nanoparticles (PMO, 11.02 nm, -28.93 mV)) are synthesized to investigate whether they can help to improve maize drought tolerance and the relevant mechanisms behind this. In planta experimental results show that under drought (15% PEG 6000, polyethylene glycol, mimicking drought stress, 96 h), compared with the control plants, 500 mg L PMO (root application, 96 h) improves maize drought tolerance, showing an increase of root length (21.6%), shoot length (21.2%), fresh weight (7.8%) and total protein (67.2%) content. In addition, PMO significantly decreases the malondialdehyde (MDA) content by 74.7% in maize under drought, compared with the control group. Further, PMO treated maize root apex shows significantly increased mitotic index (MI, 35.5%), and decreased hydrogen peroxide (40.9%). Compared with the control under drought (15% PEG, 96 h), thr root apex of maize plants treated with PMO (500 mg L , root application, 96 h) have significantly lower level of H O . Overall, the results show that PMO can alleviate drought-inhibited cell mitosis activities via maintaining ROS (reactive oxygen species) homeostasis. In this study, it is not only shown that PMO can be a good nano-regulator candidate to improve maize drought tolerance, but also that PMO has potential to modulate plant cell mitosis activities.
聚（丙烯酸）酸包覆的 Mn3O4 纳米粒子（PAA@Mn O 纳米粒子（PMO，11.02nm，-28.93mV））被合成，以研究它们是否能帮助提高玉米的耐旱性以及背后的相关机制。在体内实验结果表明，与对照植株相比，在干旱条件下（15%PEG6000，聚乙二醇，模拟干旱胁迫，96h），500mgL-1PMO（根部施用，96h）可提高玉米的耐旱性，表现为根长增加（21.6%）、茎长增加（21.2%）、鲜重增加（7.8%）和总蛋白含量增加（67.2%）。此外，PMO 可使干旱胁迫下玉米的丙二醛（MDA）含量显著降低 74.7%，与对照组相比。此外，PMO 处理的玉米根尖显示出明显增加的有丝分裂指数（MI，35.5%），和减少的过氧化氢（40.9%）。与干旱对照（15%PEG，96h）相比，用 PMO（500mgL-1，根部施用，96h）处理的玉米根尖的 H2O2 含量显著降低。总的来说，结果表明 PMO 可以通过维持 ROS（活性氧）平衡来缓解干旱抑制的细胞有丝分裂活动。在这项研究中，不仅表明 PMO 可以作为一种很好的纳米调节剂来提高玉米的耐旱性，而且表明 PMO 具有调节植物细胞有丝分裂活动的潜力。
