Abstract
The objective of the present work was to study biochemical alterations in lime plants infected by the Candidatus Phytoplasma aurantifoliae. Changes in antioxidant activities, content of chlorophylls (Chl), carotenoids (Car), soluble proteins, sugars and auxin (IAA) in infected plant were investigated. The activities of polyphenol oxidase (PPO), peroxidase (POX) and superoxide dismutase (SOD) were observed to be greater in infected leaves than the healthy control. Also according to non-denaturing PAGE, in infected leaves all the antioxidative enzymes isoforms were stronger than that of the healthy control. These results suggest that antioxidant enzymes can be activated in response to infection by phytoplasma. The decrease in content of proteins, total soluble and reducing sugars in infected plants point out changes in host metabolism due to the phytoplasma infection. The reduction in chlorophylls and auxin content shows that the phytoplasma can interfere in photosynthesis and induces senescence in the leaf. In conclusion, this study provides new insights into the lime response to phytoplasma infection.
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Abbreviations
- Car:
-
Carotenoid
- CAT:
-
Catalase
- Chl:
-
Chlorophyll
- EDTA:
-
Ethylene diamine tetra acetic acid
- l-DOPA:
-
l-3,4-dihydroxyphenylalanine
- NBT:
-
Nitroblue tetrazolium
- POX:
-
Peroxidase
- ROS:
-
Reactive oxygen species
- SDS-PAGE:
-
Sodium dodecylsulphate-5 polyacrylamide gel electrophoresis
- SOD:
-
Superoxide dismutase
- TBA:
-
Thiobarbituric acid
- TCA:
-
Trichloroacetic acid
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Acknowledgments
The financial support of this research was provided partly by a grant-in-aid for research projects from the Engineering Research Institute, Ministry of Agricultural Jahad. The authors also acknowledge the financial support of the College of Sciences, University of Tehran. We are also grateful to the Engineering Research Institute for providing the lime plants infected by ‘Candidatus Phytoplasma aurantifoliae’.
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Communicated by B. Barna.
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Zafari, S., Niknam, V., Musetti, R. et al. Effect of phytoplasma infection on metabolite content and antioxidant enzyme activity in lime (Citrus aurantifolia). Acta Physiol Plant 34, 561–568 (2012). https://doi.org/10.1007/s11738-011-0855-0
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DOI: https://doi.org/10.1007/s11738-011-0855-0