Yue Le, Xie Budiao, Cao Xuesong, Chen Feiran, Wang Chuanxi, Xiao Zhenggao, Jiao Liya, Wang Zhenyu
Institute of Environmental Processes and Pollution Control and School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China.
Jiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, Wuxi 214122, China.
Nanomaterials (Basel). 2023 Apr 26;13(9):1484. doi: 10.3390/nano13091484.
Strategies to reduce the risk of drought damage are urgently needed as intensified climate change threatens agricultural production. One potential strategy was using nanomaterials (NMs) to enhance plant resistance by regulating various physiological and biochemical processes. In the present study, 10 mg kg manganese ferrite (MnFeO) NMs had the optimal enhancement to elevate the levels of biomass, photosynthesis, nutrient elements, and polysaccharide in rice by 10.9-525.0%, respectively, under drought stress. The MnFeO NMs were internalized by rice plants, which provided the possibility for rice to better cope with drought. Furthermore, as compared with drought control and equivalent ion control, the introduction of MnFeO NMs into the roots significantly upregulated the drought-sensing gene (29.4%) and the receptor gene (59.9%). This activation stimulated downstream abscisic acid, proline, malondialdehyde, and wax biosynthesis by 23.3%, 38.9%, 7.2%, and 26.2%, respectively. In addition, 10 mg·kg MnFeO NMs significantly upregulated the relative expressions of , , , , and , and increased IAA content significantly, resulting in an enlarged root angle and a deeper and denser root to help the plant withstand drought stresses. The nutritional quality of rice grains was also improved. Our study provides crucial insight for developing nano-enabled strategies to improve crop productivity and resilience to climate change.
由于气候变化加剧威胁着农业生产，因此迫切需要降低干旱损害风险的策略。一种潜在策略是使用纳米材料（NMs）通过调节各种生理和生化过程来增强植物抗性。在本研究中，10 mg·kg 锰铁氧体（MnFeO）纳米材料具有最佳的增强效果，在干旱胁迫下，可使水稻的生物量、光合作用、营养元素和多糖水平分别提高10.9% - 525.0%。MnFeO纳米材料被水稻植株吸收，这为水稻更好地应对干旱提供了可能。此外，与干旱对照和等效离子对照相比，将MnFeO纳米材料引入根部可显著上调干旱感应基因（29.4%）和受体基因（59.9%）。这种激活分别刺激了下游脱落酸、脯氨酸、丙二醛和蜡质生物合成23.3%、38.9%、7.2%和26.2%。此外，10 mg·kg MnFeO纳米材料显著上调了 、 、 、 和 的相对表达，并显著增加了吲哚乙酸含量，导致根角增大且根系更深更密，有助于植株抵御干旱胁迫。水稻籽粒的营养品质也得到了改善。我们的研究为开发纳米技术策略以提高作物生产力和应对气候变化的恢复力提供了关键见解。
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