Influence of an endophytic fungus on host plant selection by a polyphagous moth via volatile spectrum changes
By Mustapha F. A. Jallow, Dereje Dugassa-Gobena, S. Vidal. Arthropod-Plant Interactions, 2008
101 citations recorded by the source corpus.
Recently the role of micro-organisms as mediators of plant-herbivore interactions has been increasingly acknowledged in ecological research. We investigated the interaction between an unspecialized root fungal endophyte (Acremonium strictum) and the polyphagous moth Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae), in greenhouse and laboratory bioassays. Specifically we examined in tomato (Lycopersicon esculentum Mill.) the systemic effects of the endophytic fungus on the host selection behaviour of female moths for oviposition and the volatile profiles of host plants to understand the mechanisms acting in this multi-trophic model system. Both laboratory and field strains of H. armigera moths oviposited more on leaves of A. strictum inoculated plants as compared to endophyte-free plants, both in free flight cages and in tethered moth laboratory experiments; the moth’s preferences were significant between 10 and 18 days after inoculation. The analysis of volatile profiles showed strong quantitative differences between treatments. Endophyte inoculated plants emitted diverse terpenes and sesquiterpenes at significantly lower amounts as compared to endophyte free-plants, except for α-terpinene, which did not differ between the treatments, and trans-β-caryophyllene, which was emitted in significantly higher amounts on inoculated plants. β-Thujene and α-phellandrene accounted for 73.3 and 12.0% of total amounts of volatiles emitted from endophyte-free and inoculated plants, respectively. Our findings demonstrate that A. strictum is able to systemically influence the host selection of H. armigera moths for oviposition; conceivably mediated by the induced changes in volatile emissions (and probably additional biochemical parameters of the host plants, which have not been analysed so far). We argue for a more detailed assessment of micro-organisms invisibly colonizing plants, when studying plant-herbivore or multitrophic interactions.
Subfields: Ecology, Evolution, Behavior and Systematics, Insect Science
View Paper: https://www.semanticscholar.org/paper/7b2c94e201edfcba3ff0068cd1e48896ec6c2713
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In Ecology, Evolution, Behavior and Systematics
In Insect Science
Citations in the corpus
- Fungal endophyte negative effects on herbivory are enhanced on intact plants and maintained in a subsequent generation (2010, background): “…nutritional quality (Bernays, 1993), growth, and competitive abilities (Marks et al., 1991; Faeth et al., 2004), or other cues, such as volatiles (Jallow et al., 2008) and secondary metabolites (Arnold, 2008) that may have major impacts on the organisms feeding on the endophyte-colonised host…”
- Defensive mutualism between plants and endophytic fungi? (2010, unknown): “…et al. 1985, 1986; Hol et al. 2007; Hoveland et al. 1980, 1983; Huitu et al. 2008; Humphries et al. 2001; Hunt and Newman 2005; Jackson et al. 1997; Jallow et al. 2008; Johnson et al. 1985; Johnson-Cicalese and White 1990; Kimmons et al. 1990; Kindler et al. 1991; Knoch et al. 1993; Koga et al.…”
- Plant Volatiles-based Insect Pest Management in Organic Farming (2010, background): “armigera moths for oviposition probably mediated by the induced changes in volatile emissions (Jallow et al., 2008).”
- Effect of inoculation method and plant growth medium on endophytic colonization of sorghum by the entomopathogenic fungus Beauveria bassiana (2009, unknown): “Fungal endophytes play an important role in protecting plants against herbivorous insects (Jallow et al. 2004, 2008) and plant pathogens (Ownley et al. 2008).”
- Persistent, symptomless, systemic, and seed-borne infection of lettuce by Botrytis cinerea (2009, background): “…in that they protect the plant against root invading nematodes (Hallmann & Sikora, 1996); others benefit plant growth or alter nutrient cycling (Lemons et al. , 2005; Omacini et al. , 2006), and there are widespread reports of endophytes altering insect plant interactions (Jallow et al. , 2008).”