State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Agriculture, South China Agricultural University, Guangzhou, 510642, China.
Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture and Rural Affairs, Guangzhou, 510642, China.
Environ Sci Pollut Res Int. 2023 Jul;30(33):80349-80363. doi: 10.1007/s11356-023-27892-4. Epub 2023 Jun 9.
Nanoparticles (NPs) have been widely used in agriculture, and lanthanum oxide nanoparticles (LaO) NPs can regulate plant growth. LaO NPs treatment was hypothesized to affect the accumulation and distribution of substances in rice seedlings under wet and dry nursery conditions. The objective of the present study was to ascertain the effects of LaO NPs foliar spray on the morphology and physiology of fragrant rice seedlings under wet and dry nursery conditions. Seedlings of two fragrant rice cultivars, namely 'Xiangyaxiangzhan' and 'Yuxiangyouzhan,' were grown under wet and dry nursery conditions with LaO NPs treatments at three concentrations (CK, LaO NPs 0 mg L; T1, LaO NPs 20 mg L; and T2, LaO NPs 40 mg L). The results showed that the seedling-raising method was significantly associated with LaO NPs application (P < 0.05), affecting the leaf area of both cultivars. Changes in plant morphological parameters, such as dry weight and root-shoot ratio, were the reasons for the differences in cultivars in response to LaO NPs application. Changes were also observed in the plant morphological and physiological parameters of leaf area, specific leaf area, chlorophyll contents, antioxidant properties, and activities of nitrogen metabolism enzymes. The relationship between morphological and physiological processes in fragrant rice was investigated to test the hypothesis. In both wet and dry nursery methods, the T2 concentration of LaO NPs was beneficial for rice seedlings and significantly increased their leaf area due to changes in morphological and physiological parameters. Therefore, the results of this study provide a theoretical basis for expanding the research on LaO NPs application in rice, as well as relevant references for strengthening rice seedlings in the nursery, which has a positive effect on the grain yield improvement in fragrant rice.
纳米粒子（NPs）已被广泛应用于农业领域，其中氧化镧纳米粒子（LaO NPs）可调节植物生长。据推测，LaO NPs 处理会影响水稻幼苗在湿润和干燥苗床条件下物质的积累和分布。本研究旨在确定叶面喷施 LaO NPs 对湿润和干燥苗床条件下香稻幼苗形态和生理特性的影响。选用两个香稻品种‘湘雅香占’和‘玉香油占’，在湿润和干燥苗床条件下分别用 0、20、40 mg·L-1 的 LaO NPs 进行处理。结果表明，苗床育秧方式与 LaO NPs 应用显著相关（P<0.05），影响两个品种的叶面积。植株形态参数（如干重和根冠比）的变化是导致品种对 LaO NPs 应用响应差异的原因。叶片面积、比叶面积、叶绿素含量、抗氧化特性和氮代谢酶活性等植物形态和生理参数也发生了变化。调查香稻形态和生理过程之间的关系，以检验假说。在湿润和干燥苗床方法下，LaO NPs 的 T2 浓度有利于水稻幼苗，由于形态和生理参数的变化，显著增加了其叶面积。因此，本研究结果为扩展 LaO NPs 在水稻中的应用研究提供了理论依据，为加强苗床水稻提供了相关参考，对提高香稻的产量具有积极意义。
