Kasote Deepak M, Lee Jisun H J, Jayaprakasha Guddarangavvanahally K, Patil Bhimanagouda S
Vegetable and Fruit Improvement Center, Department of Horticultural Sciences, Texas A&M University, 1500 Research Parkway, Suite A120, College Station, TX 77845-2119, USA.
Nanomaterials (Basel). 2021 Apr 15;11(4):1016. doi: 10.3390/nano11041016.
The use of nanoscale nutrients in agriculture to improve crop productivity has grown in recent years. However, the bioefficacy, safety, and environmental toxicity of nanoparticles are not fully understood. Herein, we used onion bulb extract to synthesize manganese oxide nanoparticles (MnO-NPs). X-ray diffraction, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy were used for the structural and morphological characterization of synthesized MnO-NPs. The MnO-NPs were oval shape crystalline nanoparticles of MnO with sizes 22-39 nm. In further studies, we assessed the comparative toxicity of seed priming with MnO-NPs and its bulk counterparts (KMnO and MnO), which showed seed priming with MnO-NPs had comparatively less phytotoxicity. Investigating the effect of seed priming with different concentrations of MnO-NPs on the hormonal, phenolic acid, chlorophyll, and antioxidant profiles of watermelon seedlings showed that treatment with 20 mg·L MnO-NPs altered the chlorophyll and antioxidant profiles of seedlings. At ≤40 mg·L, MnO-NPs had a remarkable effect on the phenolic acid and phytohormone profiles of the watermelon seedlings. The physiological outcomes of the MnO-NP seed priming in watermelon were genotype-specific and concentration-dependent. In conclusion, the MnO-NPs were safer than their bulk counterparts and could increase crop productivity.
近年来，农业中使用纳米级营养素以提高作物产量的情况日益增多。然而，纳米颗粒的生物有效性、安全性和环境毒性尚未得到充分了解。在此，我们使用洋葱鳞茎提取物合成了氧化锰纳米颗粒（MnO-NPs）。利用X射线衍射、X射线光电子能谱和高分辨率透射电子显微镜对合成的MnO-NPs进行了结构和形态表征。MnO-NPs是尺寸为22-39nm的椭圆形MnO晶体纳米颗粒。在进一步的研究中，我们评估了MnO-NPs及其块状对应物（KMnO和MnO）引发种子的相对毒性，结果表明MnO-NPs引发种子具有相对较低的植物毒性。研究不同浓度的MnO-NPs引发种子对西瓜幼苗的激素、酚酸、叶绿素和抗氧化剂谱的影响表明，用20mg·L的MnO-NPs处理会改变幼苗的叶绿素和抗氧化剂谱。在≤40mg·L时，MnO-NPs对西瓜幼苗的酚酸和植物激素谱有显著影响。MnO-NPs引发西瓜种子的生理结果具有基因型特异性和浓度依赖性。总之，MnO-NPs比其块状对应物更安全，并且可以提高作物产量。
