Do plants use airborne cues to recognize herbivores on their neighbours?

@article{Choh2012DoPU,
  title={Do plants use airborne cues to recognize herbivores on their neighbours?},
  author={Yasuyuki Choh and Rika Ozawa and Junji Takabayashi},
  journal={Experimental and Applied Acarology},
  year={2012},
  volume={59},
  pages={263-273}
}
Plants show defensive responses after exposure to volatiles from neighbouring plants infested by herbivores. When a plant’s neighbours host only species of herbivores that do not feed on the plant itself, the plant can conserve energy by maintaining a low defence level. An intriguing question is whether plants respond differently to volatiles from plants infested by herbivores that pose greater or lesser degrees of danger. We examined the secretion of extrafloral nectar (EFN) in lima bean… 

Defense Suppression through Interplant Communication Depends on the Attacking Herbivore Species

This study shows that herbivore species identity affects volatile-mediated interplant communication in zucchini, revealing a new example of Herbivore defense suppression through volatile cues.

Plant–plant communication mediated by airborne signals: ecological and plant physiological perspectives

This work outlines studies on plant-plant communication from both ecological and plant physiological perspectives, and reviews the signaling pathways involved, priming, sensitivity, and how plants receive volatile compounds in plant–plant communications.

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The research found that asymptomatic pathogen infection altered plant traits and changed the life history and behaviour of an herbivorous insect and its parasitoid, and its consequent effects on an insect community at higher trophic levels.

Different population densities and continuous feeding by Oligonychus yothersi (McGregor) (Acari: Tetranychidae) affect the emissions of herbivore-induced plant volatiles on avocado (Persea americana Mill. cv. Hass) shoots under semi-field conditions

Results indicate that higher mite-population densities and continuous O. yothersi-feeding increases the amounts of HIPVs emitted by O.YotherSI-infested shoots in summer, which indicates that environmental conditions maximized or constrained those emissions.

Oviposition Experience of Parasitoid Wasps with Nonhost Larvae Affects their Olfactory and Contact-Behavioral Responses toward Host- and Nonhost-Infested Plants

The density of nonhost species as well as that of host species in the field should be considered when assessing the host-searching behavior of parasitoid wasps, as a negative experience appears to have negatively affected the olfactory responses to nonhost-infested plants.

Behavioral Response of Halyomorpha halys (Hemiptera: Pentatomidae) and Its Egg Parasitoid Trissolcus japonicus (Hymenoptera: Scelionidae) to Host Plant Odors

The results indicate the potential of developing H. halys and T. japonicus attractants or/and repellents based on host plant volatiles and suggest possible adaptive responses of this pest and its egg parasitoid to similar host plant odors.

Herbivore-specific plant volatiles prime neighboring plants for non-specific defense responses.

Herbivore species-specific HIPVs primed neighboring plants, which produced 2 to 4 times more volatiles and JA after simulated herbivory when compared to similarly treated constitutive volatile-exposed plants, and volatile profiles emitted by primed plants depended only on the challenging herbivor species but not on the species- specific HIPV profile of damaged emitter plants.

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    Novartis Foundation symposium
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For application of direct and indirect defence in agriculture, it is important to compare the relative importance of these two defence types in the same plant species.
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