Abstract
Plant-mediated interactions between herbivores are important determinants of community structure and plant performance in natural and agricultural systems. Current research suggests that the outcome of the interactions is determined by herbivore and plant identity, which may result in stochastic patterns that impede adaptive evolution and agricultural exploitation. However, few studies have systemically investigated specificity versus general patterns in a given plant system by varying the identity of all involved players. We investigated the influence of herbivore identity and plant genotype on the interaction between leaf-chewing and root-feeding herbivores in maize using a partial factorial design. We assessed the influence of leaf induction by oral secretions of six different chewing herbivores on the response of nine different maize genotypes and three different root feeders. Contrary to our expectations, we found a highly conserved pattern across all three dimensions of specificity: The majority of leaf herbivores elicited a negative behavioral response from the different root feeders in the large majority of tested plant genotypes. No facilitation was observed in any of the treatment combinations. However, the oral secretions of one leaf feeder and the responses of two maize genotypes did not elicit a response from a root-feeding herbivore. Together, these results suggest that plant-mediated interactions in the investigated system follow a general pattern, but that a degree of specificity is nevertheless present. Our study shows that within a given plant species, plant-mediated interactions between herbivores of the same feeding guild can be stable. This stability opens up the possibility of adaptations by associated organisms and suggests that plant-mediated interactions may contribute more strongly to evolutionary dynamics in terrestrial (agro)ecosystems than previously assumed.
Highlights
Plants respond to herbivore attack by increasing the synthesis of defensive metabolites and proteins, reconfiguring their primary metabolism and adjusting their growth patterns (Howe and Jander 2008; Zhu-Salzman et al 2008; Machado et al 2013)
We compared the response of D. balteata to leaf elicitation by wounding and wounding combined with the application of S. littoralis oral secretions
The oral secretions of S. littoralis contain elicitors that induce a plant response similar to real herbivore attack (Erb et al 2009), enabling us to evaluate whether D. balteata responds to leaf damage or, to the plant’s reaction to exposure to herbivore-associated molecular patterns (HAMPs)
Summary
Plants respond to herbivore attack by increasing the synthesis of defensive metabolites and proteins, reconfiguring their primary metabolism and adjusting their growth patterns (Howe and Jander 2008; Zhu-Salzman et al 2008; Machado et al 2013). Many of these responses extend from the site of attack to nonattacked tissues and persist even after the attack is over (Heil and Ton 2008; Gomez et al 2010). Herbivore attack can influence other plant-associated organisms, including other herbivores.
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