Abstract
Clearly defining the taxonomic identity of a potential biocontrol agent is an essential component of any biological control programme. As part of such a programme against Impatiens glandulifera, a highly invasive annual weed in both Europe and North America, the rust fungus Puccinia komarovii was collected on this host plant in its native Himalayan range. However, current literature indicates that P. komarovii is a pathogen of a number of Impatiens species globally and was described originally from I. parviflora, a species native to Asia and now naturalized in Europe. Morphological comparisons, based on urediniospore and teliospore measurements, were generally inconclusive in showing any clear differences between the accession from I. glandulifera and those from other Impatiens species. Both, nrDNA ITS and ITS2-LSU sequence analyses indicated a difference between the rust infecting I. glandulifera compared to accessions on other hosts. However, the large variations in both ITS and 28S (ITS2-LSU) sequences determined within single accessions in this study, makes a clear separation difficult. Cross-inoculation experiments, using one accession of P. komarovii ex I. glandulifera (from India) and two accessions of P. komarovii ex I. parviflora (from China and Hungary), confirmed the specificity of these strains to their original hosts. Two Himalayan Impatiens species, I. scabrida and I. brachycentra, showed varying levels of susceptibility to these rust accessions, where the former was weakly susceptible to all three accessions and the latter was weakly susceptible only to P. komarovii ex I. parviflora (from China). However, commercial cultivars of I. balsamina proved to be fully susceptible to all rust accessions, although this has not been demonstrated under field conditions in India. Based on these host specificity differences between the rust accessions, we propose a new variety: Puccinia komarovii var. glanduliferae var. nov. associated with I. glandulifera in the Himalayas.
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Acknowledgments
We are very grateful to the Department of Environment, Food and Rural Affairs (DEFRA), the UK Environment Agency, the Scottish Executive, West Country Rivers Trust and Network Rail for funding this research. We would like to thank Dr. Rajesh Kumar (National Fungal Culture Collection of India) and Dr. Usha Dev, Jyoti Bhardwaj (National Bureau of Plant Genetic Resources, India) for assisting in the field collections in the Indian Himalayas. We thank our CABI colleagues in our offices in India and Pakistan, and Dr. PC Agrawal (National Bureau of Plant Genetic Resources, India), for working to facilitate surveys and export of biological material from the Himalaya. We are also grateful to Dr. C. Uma Maheswari and Dr. Nita Mathur (Division of Plant Pathology, Indian Agricultural Research Institute) for the original identification of the rust from Impatiens glandulifera from the Indian Himalayas. We would also like to thank Kate Pollard (CABI) for technical assistance during this research. ZB acknowledges the support of János Bolyai Research Scholarships of the Hungarian Academy of Sciences (MTA).
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Tanner, R.A., Ellison, C.A., Seier, M.K. et al. Puccinia komarovii var. glanduliferae var. nov.: a fungal agent for the biological control of Himalayan balsam (Impatiens glandulifera). Eur J Plant Pathol 141, 247–266 (2015). https://doi.org/10.1007/s10658-014-0539-x
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DOI: https://doi.org/10.1007/s10658-014-0539-x
Keywords
- Cross inoculation studies
- Invasive weeds
- ITS and 28S sequence analyses
- nrDNA variation
- Rust fungi
- Taxonomy