Role of host‐plant selection in resistance of wild Solanum species to Macrosiphum euphorbiae and Myzus persicae |
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| Authors: | Julien Pompon Dan Quiring Philippe Giordanengo Yvan Pelletier |
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| Affiliation: | 1. Population Ecology Group, Department of Biology, University of New Brunswick, Fredericton, New Brunswick, E3B 6C2, Canada;2. Potato Research Center, Agriculture and Agri‐Food Canada, 850 Lincoln Rd, Fredericton, New Brunswick, E3B 4Z7, Canada;3. Biologie des Plantes et Contr?le des Insectes Ravageurs (UPRES EA 3900), Université Jules Verne, Amiens Cedex, France |
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| Abstract: | Damage to potatoes by Macrosiphum euphorbiae (Thomas) and Myzus persicae (Sulzer) (both Hemiptera: Aphididae) can be controlled through plant resistance. We used ethological experiments and electric penetration graph (EPG) analysis to evaluate the role of host selection in the previously assessed resistance levels of Solanum accessions: Solanum circaeifolium Bitter subsp. capsicibaccatum (Cárdenas) (PI210036), S. chomatophilum Bitter (PI243340 and PI310990), S. okadae Hawkes & Hjert. (PI458367), S. oplocense Hawkes (PI473368), S. pinnatisectum Dunal (PI186553), S. polyadenium Greenm. (PI230463), S. tarijense Hawkes (PI414150), and S. trifidum Correll (PI255538), to M. euphorbiae and M. persicae. Through multivariate analysis, we grouped behavioural variables into factors, which we related to host selection behaviours, and then evaluated whether factors varied between each accession and the susceptible S. tuberosum. None of the factors obtained by ethological experiments differed among accessions. Four of six and three of five factors obtained through EPG varied among accessions for M. euphorbiae and M. persicae, respectively, and were used to suggest resistance characteristics. The resistance to M. persicae of both S. chomatophilum accessions was associated with pathway activity disturbance. Solanum tarijense and S. polyadenium resistance to M. persicae resulted from leaf surface characteristics, which may be trichomes. Solanum oplocense and S. trifidum resistance to M. euphorbiae resulted from the wound response system, whereas S. pinnatisectum resistance may stem from nutritionally unbalanced or toxic phloem sap. Solanum polyadenium resistance to M. euphorbiae was phloem‐based. Solanum circaeifolium ssp. capsicibaccatum resistance to M. persicae, and the resistance of PI243340 S. chomatophilum and S. tarijense to M. euphorbiae were not related to host selection and therefore were presumably due to physiologically active compounds. |
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| Keywords: | aphid potato resistance resistance mechanism host‐plant selection behaviour multivariate analysis behavioural analysis Hemiptera Aphididae Solanaceae electric penetration graph |
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