Abstract
Microbe–plant interactions often lead to a decrease in the reactive oxygen species (ROS) level of plant cells, which allows pathogen survival through the suppression of plant immune responses. In the present investigation, we tested whether transformation of Rubia cordifolia cells by Agrobacterium rhizogenes had a similar effect. We isolated partial cDNA sequences of ascorbate peroxidase, catalase and Cu/Zn superoxide dismutase genes (RcApx1, RcApx2, RcApx3, RcCAT1, RcCAT2, RcCSD1, RcCSD2 and RcCSD3) from plant tissues, as well as pRiA4-transformed and normal calli of Rubia cordifolia, and studied their expression by real-time PCR. Transcription profiling revealed that ascorbate peroxidase (RcApx1) and Cu/Zn superoxide dismutase (RcCSD1) were the most abundant transcripts present in both plant tissues and non-transformed calli. Catalase genes were weakly expressed in these samples. The pRiA4-transformed calli showed enhanced expression of several genes encoding ROS-detoxifying enzymes. Confocal microscopy imaging revealed decreased ROS level in pRiA4-transformed calli compared to the control. These results demonstrate that A. rhizogenes, like other plant pathogens, uses a strategy aimed at decreasing ROS levels in host cells through the general upregulation of its antioxidant genes.
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Acknowledgments
This work was supported by grants from the Russian Foundation for Basic Research, by the Grant Program “Molecular and Cell Biology” of the Russian Academy of Sciences, and by grants from the Far East Branch of the Russian Academy of Sciences 09-III-A-06-187, 10-III-B-06-086, 09-III-A-05-137. The authors would like to express their gratitude to Dr. S. Shedko, Dr. E. Artyukova, Dr. M. Kozyrenko and Dr. A. Gontcharov for their help with phylogenetic analysis.
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Suppl. Fig. 1
. Maximum-likelihood cladogram for ascorbate peroxidase isoenzymes obtained using Phyml program (300 bootstraps). Similar tree was also obtained with the maximum parsimony method (from Phylip package, 1,000 bootstraps). Numbers on the branches represent bootstrap values as obtained from ML/MP, respectively (only values >50% are presented; lower values are denoted ‘-’). The GenBank accession numbers of the proteins are given in the cladogram. The sequences obtained in this work are marked by dots (JPG 204 kb)
Suppl. Fig. 2
. Maximum-likelihood cladogram for Cu/Zn superoxide dismutase isoenzymes obtained using Phyml program (300 bootstraps). Similar tree was also obtained with the maximum parsimony method (from Phylip package, 1,000 bootstraps). Numbers on the branches represent bootstrap values as obtained from ML/MP, respectively (only values >50% are presented; lower values are denoted ‘-’). The GenBank accession numbers of the proteins are given in the cladogram. The sequences obtained in this work are marked by dots (JPG 146 kb)
Suppl. Fig. 3
. Maximum-likelihood cladogram for catalase isoenzymes obtained using Phyml program (300 bootstraps). Similar tree was also obtained with the maximum parsimony method (from Phylip package, 1,000 bootstraps). Numbers on the branches represent bootstrap values as obtained from ML/MP, respectively (only values >50% are presented; lower values are denoted ‘-’). The GenBank accession numbers of the proteins are given in the cladogram. The sequences obtained in this work are marked by dots (JPG 144 kb)
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Shkryl, Y.N., Veremeichik, G.N., Bulgakov, V.P. et al. Decreased ROS level and activation of antioxidant gene expression in Agrobacterium rhizogenes pRiA4-transformed calli of Rubia cordifolia . Planta 232, 1023–1032 (2010). https://doi.org/10.1007/s00425-010-1237-3
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DOI: https://doi.org/10.1007/s00425-010-1237-3