Cross-Compartment Herbivory Effects on Antagonists and Mutualists and Their Consequences for Plant Fitness

Barber, Nicholas A.

doi:10.1007/978-3-319-91614-9_11

Cited by 1 publication

(1 citation statement)

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“…Systemic defenses can occur in the same types of plant tissues, such as foliar herbivory enhancing defenses in non-damaged leaves (Vos et al, 2013), as well as across different tissue types, such as aboveground herbivory affecting belowground roots or belowground herbivory modifying aboveground tissues (i.e., cross-compartment systemic responses; Biere and Goverse, 2016;Papadopoulou and van Dam, 2017). Cross-compartment systemic responses to herbivory can modify plant growth and defense, resulting in indirect interactions between above-and belowground herbivores feeding on a shared host plant (Barber, 2018). Above-and belowground herbivores can negatively impact or positively facilitate each other through indirect plant-mediated interactions (Erb et al, 2009a;Huang et al, 2013Huang et al, , 2014, although the outcomes of such herbivoreherbivore interactions and underlying cross-compartment mechanisms remain underexplored.…”

Section: Introductionmentioning

confidence: 99%

Undercover operation: Belowground insect herbivory modifies systemic plant defense and repels aboveground foraging insect herbivores

et al. 2022

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Plants attacked by insects may induce defenses locally in attacked plant tissues and/or systemically in non-attacked tissues, such as aboveground herbivory affecting belowground roots or belowground herbivory modifying aboveground tissues (i.e., cross-compartment systemic defense). Through induced systemic plant defenses, above-and belowground insect herbivores indirectly interact when feeding on a shared host plant. However, determining the systemic effects of herbivory on cross-compartment plant tissues and cascading consequences for herbivore communities remains underexplored. The goal of this study was to determine how belowground striped cucumber beetle (Acalymma vittatum) larval herbivory alters aboveground zucchini squash (Cucurbita pepo subsp. pepo) defenses and interactions with herbivores, including adult cucumber beetles and squash bugs (Anasa tristis). To explore this question, field and laboratory experiments were conducted to compare responses of aboveground herbivores to belowground larvae-damaged plants and non-damaged control plants. We also characterized changes in defensive chemicals and nutritional content of aboveground plant structures following belowground herbivory. We discovered belowground herbivory enhanced aboveground plant resistance and deterred aboveground foraging herbivores. We also found that larvae-damaged plants emitted higher amounts of a key volatile compound, (E)-β-ocimene, compared to non-damaged controls. Further investigation suggests that other mechanisms, such as plant nutrient content, may additionally contribute to aboveground herbivore foraging decisions. Collectively, our findings underscore connections between above-and belowground herbivore communities as mediated through induced systemic defenses of a shared host plant. Specifically, these findings indicate that belowground larval herbivory systemically enhances plant defenses and deters a suite of aboveground herbivores, suggesting larvae may manipulate aboveground plant defenses for their own benefit, while plants may benefit from enhanced systemic defenses against multi-herbivore attack.

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