Abstract
Diseases of agricultural crops are caused by pathogens from several higher-order phylogenetic lineages including fungi, straminipila, eubacteria, and metazoa. These pathogens are commonly managed with pesticides due to the lack of broad-spectrum host resistance. Gastrodia anti-fungal protein (GAFP; gastrodianin) may provide a level of broad-spectrum resistance due to its documented anti-fungal activity in vitro and structural similarity to insecticidal lectins. We transformed tobacco (Nicotiana tabacum cv. Wisconsin 38) with GAFP-1 and challenged transformants with agriculturally important plant pathogens from several higher-order lineages including Rhizoctonia solani (fungus), Phytophthora nicotianae (straminipile), Ralstonia solanacearum (eubacterium), and Meloidogyne incognita (metazoan). Quantitative real-time PCR and western blotting analysis indicated that GAFP-1 was transcribed and translated in transgenic lines. When challenged by R. solani and P. nicotianae, GAFP-1 expressing lines had reduced symptom development and improved plant vigor compared to non-transformed and empty vector control lines. These lines also exhibited reduced root galling when challenged by M. incognita. Against R. solanacearum expression of GAFP-1 neither conferred resistance, nor exacerbated disease development. These results indicate that heterologous expression of GAFP-1 can confer enhanced resistance to a diverse set of plant pathogens and may be a good candidate gene for the development of transgenic, root-disease-resistant crops.
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Notes
Due to debate surrounding the categorization of taxa above the phylum level, we will refer to such taxa as higher-order phylogenetic lineages instead of using the kingdom designation.
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Acknowledgments
This study was funded in part by the South Carolina Peach Council, USDA-CSREES SR-IPM grant no. 2005-34103-15588, USDA-CSREES special grant no. 2004-34126-14388, USDA NRI grant no. 2002-35319-12527, ISA Research Trust, and the John Z. Duling Research Grant Program. We thank Jessica Eisenmann for conducting the initial Phytophthora disease screening experiments and the RT-PCR gene expression experiments. We also thank Phaedra Kennedy for carrying out the transformation experiments.
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Technical Contribution No. 5172 of the Clemson University Experiment Station. This material is based upon work supported by the CSREES/USDA, under project number SC-1000642.
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Cox, K.D., Layne, D.R., Scorza, R. et al. Gastrodia anti-fungal protein from the orchid Gastrodia elata confers disease resistance to root pathogens in transgenic tobacco. Planta 224, 1373–1383 (2006). https://doi.org/10.1007/s00425-006-0322-0
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DOI: https://doi.org/10.1007/s00425-006-0322-0