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Anti-Phytophthora cinnamomi activity of Phlomis purpurea plant and root extracts |
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| Authors: | Dina Neves Paula Caetano Joana Oliveira Cristiana Maia Marília Horta Nelson Sousa Marco Salgado Lídia Dionísio Naresh Magan Alfredo Cravador |
| Affiliation: | 1. Faculdade de Ciências e Tecnologia, Universidade do Algarve, Campus de Gambelas, 8005-139, Faro, Portugal 6. ILRI (International Livestock Research Institute), Forage Genebank, CMC road, Gurdoshola, P.O Box 5689, Addis Ababa, Ethiopia 7. University College Cork, Microbiology Office, Room FSB452, 4th Floor, Food Science & Technology Building, Cork, Ireland 2. Institute for Biotechnology and Bioengineering - Centre of Genomics and Biotechnology, Plant and Animal Genomic Group, University of Algarve, Campus de Gambelas, 8005-139, Faro, Portugal 3. Department of Ecology, Environment and Plant Sciences, Stockholm University, Lilla Frescati, SE-106 91, Stockholm, Sweden 5. Instituto de Ciências Agrárias e Ambientais Mediterranicas, Universidade de évora, Pólo da Mitra, Apartado 94, 7002-554, évora, Portugal 4. Applied Mycology Group, Cranfield Health, Cranfield University, Bedford, MK43 0AL, UK |
| Abstract: | Phlomis purpurea (Lamiaceae), found in Quercus suber and Quercus ilex ssp. rotundifolia forest habitats in southern Portugal, is a non-host for the oomycete Phytophthora cinnamomi, the main biotic factor involved in cork oak and holm oak decline in the Iberian Peninsula. The effect of P. purpurea crude ethanol root extract was evaluated in vitro on P. cinnamomi mycelial growth, sporangial production, zoospore release and germination as well as on chlamydospore production and viability. The protection of cork oak against infection by the pathogen was also evaluated in planta. At 10 mg ml?1, in vitro inhibition of the pathogen structures was 85–100 %. In addition, P. purpurea plants were shown to protect Q. suber and Q. ilex from P. cinnamomi infection and to reduce the inoculum potential in glasshouse trials, indicating the ability to reduce root infection by the pathogen. The results suggest that P. purpurea has the potential to reduce disease spread and that their root extracts could provide candidate substances for control of the important pathogen, P. cinnamomi. |
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