Abstract
Recently, it has been reported that tubers of transgenic potato (Solanum tuberosum L.) plants with decreased activity of the plastidic ATP/ADP transporter (AATP1) contain less starch, despite having an increased glucose level [P. Geigenberger et al. (2001) Plant Physiol 125:1667–1678]. The metabolic alterations correlated with enhanced resistance to the bacterium Erwinia carotovora. Here it is shown that transgenic potato tubers, possessing less starch yet increased glucose levels due to the expression of a cytoplasm-localized yeast invertase, exhibit drastic susceptibility to E. carotovora. In addition, it is demonstrated that AATP1 anti-sense tubers show an increased capacity to ward off the pathogenic fungus Alternaria solani. In contrast to AATP1 anti-sense tubers, the corresponding leaf tissue does not show changes in carbohydrate accumulation. However, upon elicitor treatment, AATP1 anti-sense leaves possess an increased capacity to release H2O2 and activate various defence-related genes, reactions that are associated with substantially delayed appearance of disease symptoms caused by Phytophthora infestans. Grafting experiments between AATP1 anti-sense plants and wild-type plants indicate the presence of a signal that is generated in AATP1 rootstocks and primes wild-type scions for potentiated activation of cellular defence responses in leaves. Together, the results suggest that (i) the enhanced pathogen tolerance of AATP1 anti-sense tubers is not due to "high sugar resistance", (ii) the increased disease resistance of AATP1 anti-sense tubers is effective against different types of pathogen and (iii) a systemic signal induced by antisensing the plastidic ATP/ADP transporter in potato tubers confers increased resistance to pathogens.
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Abbreviations
- AATP1:
-
plastidic ATP/ADP transporter
- BGL:
-
β-1,3-glucanase
- DHSA:
-
dihydroxy stearic acid
- PAL:
-
phenylalanine ammonia-lyase
- Pmg:
-
cell wall elicitor from Phytophthora sojae
- PR:
-
pathogenesis related
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Acknowledgements
We thank Drs. Jürgen Siegrist and Eckhard Thines for providing fungal and oomycete cultures, respectively. Prof. Klaus Hahlbrock, and Drs. Erich Kombrink and Guenther Strittmatter are thanked for providing cDNA clones. The provision of yeast invertase-expressing plants, originally generated by Prof. U. Sonnewald (Gatersleben), by Dr. U. Rössner (Max Planck Institute for Molecular Plant Physiology, Golm, Germany) is greatly appreciated. We thank Prof. U. Sonnewald for allowing us to work with the invertase potato lines. In the laboratories of U.C. and H.E.N., this project is financially supported by the Deutsche Forschungsgemeinschaft (Ne 418/4-1), and the Schwerpunkt Biotechnologie of the Federal State Rheinland Pfalz.
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Conrath, U., Linke, C., Jeblick, W. et al. Enhanced resistance to Phytophthora infestans and Alternaria solani in leaves and tubers, respectively, of potato plants with decreased activity of the plastidic ATP/ADP transporter. Planta 217, 75–83 (2003). https://doi.org/10.1007/s00425-003-0974-y
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DOI: https://doi.org/10.1007/s00425-003-0974-y