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Biomass-Derived Carbon Dots from Guava Leaves Promote Rice Growth and Yield in a Dose-Dependent Manner
Thi Xuan Phuong Tran1, Petr Konvalina2, Dang Hoa Tran1
1Faculty of Agronomy, University of Agriculture and Forestry, Hue University, 102 Phung Hung, Hue City 49000, Vietnam.
Nanomaterials (Basel, Switzerland)
|June 25, 2026
Summary
Guava leaf-derived carbon dots (CDs) promote rice growth and yield. A 200 ppm CD application significantly enhanced plant development and grain yield, demonstrating a dose-dependent response for sustainable agriculture.
Area of Science:
- Agricultural Science
- Materials Science
- Nanotechnology
Background:
- Biomass-derived carbon dots (CDs) offer sustainable and eco-friendly nanomaterials.
- Their application in agriculture is gaining traction due to facile synthesis and low environmental impact.
Purpose of the Study:
- To synthesize carbon dots (CDs) from guava leaves.
- To evaluate the effects of these CDs on rice (Oryza sativa L.) growth and yield.
Main Methods:
- Hydrothermal synthesis of CDs from guava leaves at 200 °C for 15 h.
- Seed treatment and field application of CDs at various concentrations.
- Assessment of plant growth parameters, photosynthetic activity, and grain yield.
Main Results:
- Synthesized fluorescent CDs with an average size of 6.17 nm and 2.46% quantum yield.
- Seed soaking in 200 ppm CDs significantly improved shoot and root lengths.
- Field application of 200 ppm CDs enhanced plant height, leaf development, tillering, and grain yield (6.13 t ha⁻¹).
- Higher concentrations showed less pronounced effects, indicating a dose-dependent response.
Conclusions:
- Guava leaf-derived CDs are effective in promoting rice growth and yield.
- The optimal concentration for significant yield enhancement was 200 ppm.
- CDs may improve plant growth via enhanced photosynthesis and oxidative stress management.
