Abstract
Nanoparticles (NPs) have been widely used in agriculture, and lanthanum oxide nanoparticles (La2O3) NPs can regulate plant growth. La2O3 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 La2O3 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 La2O3 NPs treatments at three concentrations (CK, La2O3 NPs 0 mg L−1; T1, La2O3 NPs 20 mg L−1; and T2, La2O3 NPs 40 mg L−1). The results showed that the seedling-raising method was significantly associated with La2O3 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 La2O3 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 La2O3 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 La2O3 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.
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Abbreviations
- WN:
-
Wet nursery
- DN:
-
Dry nursery
- CK:
-
La2O3 NPs concentration of 0 mg L−1
- T1:
-
La2O3 NPs concentration of 20 mg L−1
- T2:
-
La2O3 NPs concentration of 40 mg L−1
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Funding
Our research is funded by the Shanwei City provincial science and technology innovation strategy special project in 2022 (Shankezi [2022] No. 277, Project Number: 2022B002) and the Guangdong provincial key field research and development plan project (2019B020221003).
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Zhaowen Mo designed the experiments; Weifen Chen, Gaoxin Liao, and Feiyang Sun examined the characteristics; Zhaowen Mo, Weifen Chen, Zhilong Chen, Feiyang Sun, and Haoming Chen did the data analysis and paper writing; Weifen Chen, Yixian Ma, Gaoxin Liao, Zhilong Chen, Haoming Chen, Xiangru Tang, and Zhaowen Mo revised and edited the manuscript. The final manuscript was read and approved by all authors.
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Chen, W., Liao, G., Sun, F. et al. Foliar spray of La2O3 nanoparticles regulates the growth, antioxidant parameters, and nitrogen metabolism of fragrant rice seedlings in wet and dry nurseries. Environ Sci Pollut Res 30, 80349–80363 (2023). https://doi.org/10.1007/s11356-023-27892-4
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DOI: https://doi.org/10.1007/s11356-023-27892-4