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Biomass-Derived Carbon Dots from Guava Leaves Promote Rice Growth and Yield in a Dose-Dependent Manner.

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Title: Biomass-Derived Carbon Dots from Guava Leaves Promote Rice Growth and Yield in a Dose-Dependent Manner.
Authors: Tran, Thi Xuan Phuong1 (AUTHOR), Konvalina, Petr2 (AUTHOR), Tran, Dang Hoa1,3 (AUTHOR), Le, Xuan Diem Ngoc3,4 (AUTHOR), Hoang, Trong Nghia2,5 (AUTHOR), Vo-Van, Quoc-Bao4,6 (AUTHOR), Hoang, Duc An1,5 (AUTHOR), Do, Thanh Tien2,4 (AUTHOR), Duong, Thanh Hai3,6 (AUTHOR), Tran, Dang Khoa1,4 (AUTHOR) trandangkhoa@hueuni.edu.vn
Source: Nanomaterials (2079-4991). Jun2026, Vol. 16 Issue 12, p780. 16p.
Subjects: Carbon nanodots, Crop yields, Dose-effect relationship in pharmacology, Hydrothermal synthesis, Guava, Oxidative stress, Photosynthesis, Crop development
Abstract: Biomass-derived carbon dots (CDs) have attracted increasing attention in agriculture due to their simple synthesis and low environmental impact. In this study, CDs were synthesized from guava (Psidium guajava) leaves using a hydrothermal method (200 °C, 15 h). The particles had an average size of 6.17 nm and a quantum yield of 2.46%, confirming the successful synthesis of fluorescent carbon nanomaterials from the natural precursor. The effects of CDs on rice (Oryza sativa L., variety HT1) were evaluated through both seed treatment and field application. Soaking seeds in a 200 ppm CD solution for 24 h significantly enhanced shoot and root lengths (28.87 mm and 34.00 mm, respectively) among the tested treatments. In field trials, applying CDs at the same concentration also promoted plant growth, as evidenced by improvements in plant height, leaf development, tillering, and flag leaf characteristics. These changes were reflected in yield, with the highest grain yield of 6.13 t ha−1 at 200 ppm, exceeding that of the control treatment. The observed positive effects may be due to enhanced photosynthetic activity and better control of oxidative processes in plants. Nevertheless, the effect was less pronounced at higher concentrations. This trend suggests a dose-dependent response. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Biomass-Derived Carbon Dots from Guava Leaves Promote Rice Growth and Yield in a Dose-Dependent Manner.
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  Data: <searchLink fieldCode="DE" term="%22Carbon+nanodots%22">Carbon nanodots</searchLink><br /><searchLink fieldCode="DE" term="%22Crop+yields%22">Crop yields</searchLink><br /><searchLink fieldCode="DE" term="%22Dose-effect+relationship+in+pharmacology%22">Dose-effect relationship in pharmacology</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrothermal+synthesis%22">Hydrothermal synthesis</searchLink><br /><searchLink fieldCode="DE" term="%22Guava%22">Guava</searchLink><br /><searchLink fieldCode="DE" term="%22Oxidative+stress%22">Oxidative stress</searchLink><br /><searchLink fieldCode="DE" term="%22Photosynthesis%22">Photosynthesis</searchLink><br /><searchLink fieldCode="DE" term="%22Crop+development%22">Crop development</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Biomass-derived carbon dots (CDs) have attracted increasing attention in agriculture due to their simple synthesis and low environmental impact. In this study, CDs were synthesized from guava (Psidium guajava) leaves using a hydrothermal method (200 °C, 15 h). The particles had an average size of 6.17 nm and a quantum yield of 2.46%, confirming the successful synthesis of fluorescent carbon nanomaterials from the natural precursor. The effects of CDs on rice (Oryza sativa L., variety HT1) were evaluated through both seed treatment and field application. Soaking seeds in a 200 ppm CD solution for 24 h significantly enhanced shoot and root lengths (28.87 mm and 34.00 mm, respectively) among the tested treatments. In field trials, applying CDs at the same concentration also promoted plant growth, as evidenced by improvements in plant height, leaf development, tillering, and flag leaf characteristics. These changes were reflected in yield, with the highest grain yield of 6.13 t ha−1 at 200 ppm, exceeding that of the control treatment. The observed positive effects may be due to enhanced photosynthetic activity and better control of oxidative processes in plants. Nevertheless, the effect was less pronounced at higher concentrations. This trend suggests a dose-dependent response. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/nano16120780
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 16
        StartPage: 780
    Subjects:
      – SubjectFull: Carbon nanodots
        Type: general
      – SubjectFull: Crop yields
        Type: general
      – SubjectFull: Dose-effect relationship in pharmacology
        Type: general
      – SubjectFull: Hydrothermal synthesis
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      – SubjectFull: Guava
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      – SubjectFull: Oxidative stress
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      – SubjectFull: Photosynthesis
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      – SubjectFull: Crop development
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      – TitleFull: Biomass-Derived Carbon Dots from Guava Leaves Promote Rice Growth and Yield in a Dose-Dependent Manner.
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              Text: Jun2026
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