Plants encounter various abiotic stresses throughout growth and development, with aluminum stress emerging as a major global agricultural challenge that hinders plant growth and limits crop yields in acidic soils. In this study, nanomaterials with dual functions, controlled release and adsorption, were constructed to alleviate aluminum toxicity. Specifically, two metal-organic frameworks, UiO-66 and ZIF-8, were used to load naphthylacetic acid and tryptophan, respectively. These two controlled-release systems were then combined with a chitosan-based matrix (NT@CS@UZ) to enable the regulated release of both compounds at distinct rates. Concurrently, the porous structure of these materials facilitates the adsorption of soluble aluminum in the plant rhizosphere. Results show that the acidic environment accelerates ZIF-8 degradation, triggering an early release of tryptophan under aluminum stress conditions. This early release promotes plant growth and alleviates stress damage. Naphthylacetic acid is subsequently released at a slower, sustained rate to stimulate root growth and further mitigate aluminum toxicity in roots. Additionally, NT@CS@UZ effectively adsorbs aluminum ions, limiting Al³⁺ uptake by plants and creating a low-aluminum barrier to protect roots. These dual function nanomaterials significantly boost crop yield and enhance stress resilience, presenting new avenues for food security and sustainable agricultural practices.

中文翻译：

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基于金属有机框架的双功能纳米系统用于酸性土壤中的铝解毒和植物生长


植物在整个生长和发育过程中会遇到各种非生物胁迫，铝胁迫已成为一项重大的全球农业挑战，阻碍植物生长并限制酸性土壤中的作物产量。在这项研究中，构建了具有控释和吸附双重功能的纳米材料，以减轻铝的毒性。具体来说，两种金属有机框架 UiO-66 和 ZIF-8 分别用于负载萘乙酸和色氨酸。然后将这两种控释系统与基于壳聚糖的基质 （NT@CS@UZ） 相结合，以不同的速率调节两种化合物的释放。同时，这些材料的多孔结构有助于可溶性铝在植物根际中的吸附。结果表明，酸性环境加速了 ZIF-8 降解，在铝应力条件下触发色氨酸的早期释放。这种早期释放促进植物生长并减轻压力损伤。随后以较慢、持续的速度释放萘乙酸，以刺激根系生长并进一步减轻根系中的铝毒性。此外，NT@CS@UZ 可有效吸附铝离子，限制植物对 Al³⁺ 的吸收，并形成低铝屏障以保护根部。这些双重功能纳米材料显著提高作物产量并增强抗逆能力，为粮食安全和可持续农业实践开辟了新途径。