Hort. Sci. (Prague), 2014, 41(3):114-121 | DOI: 10.17221/228/2013-HORTSCI

Ascorbate metabolism in vegetative and reproductive organs of "cherry" tomatoOriginal Paper

G. Tsaniklidis1, N. Nikoloudakis2, C. Delis3, G. Aivalakis1
1 Laboratory of Plant Physiology and Morphology, Agricultural University of Athens, Athens, Greece
2 Vegetative Propagation Material Control Station, Hellenic Ministry of Rural Development and Food, Athens, Greece
3 Department of Agricultural Technology, Technological Institute of Kalamata, Kalamata, Greece

Ascorbate metabolism is an essential procedure for all plant cells that plays important roles in several physiological processes such as plant development and reactive oxygen species detoxification. To shed more light on ascorbate metabolism in certain organs of tomato plants, we performed a detailed compartmentalized analysis of ascorbate concentration, ascorbate peroxidase/dehydroascorbate reductase enzyme activities and transcript accumulation of genes related to ascorbate metabolism. Our results showed higher level of ascorbate concentration and ascorbate peroxidase and dehydroascorbate reductase activities in young leaves and shoot tips, while min. ascorbate concentration was recorded in root tips. The study of the expression of the genes involved in ascorbate metabolism revealed that several genesfollowed similar patterns. However, APX3 gene expression was considerably higher in reproductive organs, while plastidialAPX6 and DHAR2genes transcripts were barely detectable in root tips. Organ-specific expression of genes involved in ascorbate metabolism suggests that different isoenzymes have a specific role in regulation of the redox status of some of the organs in tomato plants.

Keywords: ascorbic acid; ascorbate peroxidase; dehydroascorbate reductase; monodehydroascorbate reductase;glutathione reductase

Published: September 30, 2014  Show citation

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Tsaniklidis G, Nikoloudakis N, Delis C, Aivalakis G. Ascorbate metabolism in vegetative and reproductive organs of "cherry" tomato. Hort. Sci. (Prague). 2014;41(3):114-121. doi: 10.17221/228/2013-HORTSCI.
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