Abstract
Tea (Camellia sinensis (L.) O. Kuntze) hyper-accumulates fluoride (F), mainly in the leaves. To understand how tea copes with the stress caused by F, we tracked photosynthesis, antioxidant defense, and cell ultrastructure under different F concentrations (0–50 mg L−1). High F (≥5 mg L−1) caused decreases in photosynthetic and chlorophyll fluorescence parameters. Activated oxygen metabolism was altered by F, as manifested in increasing lipid peroxidation, electrolyte leakage (EL), and accumulation of H2O2. The activities of ascorbate peroxidase (APX, EC 1.11.1.1) and catalase (CAT, EC 1.11.1.6) increased at 0–5 mg L−1 F, but sharply decreased less than 10–50 mg L−1 F. The activity of manganese superoxide dismutase (Mn-SOD, EC 1.15.1.1) decreased with increasing F concentration. Expression of genes encoding antioxidant enzymes were in accordance with their measured activities. The results suggest that the antioxidant enzymes in the tea plant can eliminate reactive oxygen species (ROS) at <5 mg L−1 F, but not at 20–50 mg L−1 F. High F increased the number of epidermal hairs on tea leaves and decreased the stomatal aperture, reducing water loss. The leaf cellular structure appeared normal under 1–50 mg L−1 F, although starch grains in chloroplast increased with increasing F. Proline and betaine play important roles in osmotic regulation in tea plant tolerating F stress. ROS scavenging and greater number of epidermal hairs are likely parts of the tea plant F-tolerance mechanism.
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Acknowledgments
The present work was financially supported by the Earmarked Fund for Modern Agro-industry Technology Research System in Tea Industry (CARS-23, the Ministry of Agriculture of P. R. China), Anhui Major Demonstration Project for Leading Talent Team on Tea Chemistry and Health, Natural Science Foundation of Anhui Province (1408085MKL38), Anhui Scientific and Technological Project (1406C085017), and Changjiang Scholars and Innovative Research Team in University (IRT1101).
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Communicated by A. Krolicka.
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Cai, H., Dong, Y., Li, Y. et al. Physiological and cellular responses to fluoride stress in tea (Camellia sinensis) leaves. Acta Physiol Plant 38, 144 (2016). https://doi.org/10.1007/s11738-016-2156-0
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DOI: https://doi.org/10.1007/s11738-016-2156-0