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Exogenous Pyrroloquinoline Quinone Application Enhances Low-Phosphorus Adaptation in Rice by Modulating Redox
Duoduo Li1, Qiru Yan1, Zhi Chu1
1Ministry of Education Key Laboratory of Crop Physiology, Ecology and Genetic Breeding/College of Agronomy, Jiangxi Agricultural University, Nanchang, China.
Physiologia Plantarum
|July 26, 2026
Summary
Pyrroloquinoline quinone (PQQ) enhances rice growth under phosphorus deficiency, especially under high light. PQQ improves root development and antioxidant capacity, aiding plant adaptation.
Area of Science:
- Agricultural Science
- Plant Physiology
- Biochemistry
Background:
- Phosphorus (P) is crucial for plant growth but often has limited soil bioavailability.
- Pyrroloquinoline quinone (PQQ) is a redox-active compound with potential applications in agriculture.
Purpose of the Study:
- To investigate the physiological effects of exogenous PQQ on rice adaptation to P deficiency.
- To determine the influence of light intensity on PQQ efficacy in rice under P-limited conditions.
Main Methods:
- Rice (Meixiangzhan cultivar) was treated with PQQ under varying light intensities (High Light, Low Light) and P supplies (Sufficient P, Deficient P).
- Analysis included rice growth, P uptake, photosynthesis, antioxidant enzyme activity (SOD, POD, CAT), and biochemical markers (H2O2, ROS, MDA, acid phosphatase, ATP).
Main Results:
- PQQ significantly improved root growth (surface area, volume, tip number) under high light and P deficiency.
- PQQ enhanced antioxidant defense by activating enzymes and reducing oxidative stress markers.
- Acid phosphatase activity and leaf ATP content were increased by PQQ, indicating improved P utilization and energy status.
Conclusions:
- Exogenous PQQ can enhance rice adaptation to P deficiency, particularly under high light conditions.
- PQQ's effectiveness is modulated by light intensity, suggesting an interaction between light and P nutrition.
- Further research is warranted to explore molecular mechanisms and field applicability.
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