The composite effect of transgenic plant volatiles for acquired immunity to herbivory caused by inter-plant communications.
A blend of volatile organic compounds (VOCs) emitted from plants induced by herbivory enables the priming of defensive responses in neighboring plants. These effects may provide insights useful for pest control achieved with transgenic-plant-emitted volatiles. We therefore investigated, under both laboratory and greenhouse conditions, the priming of defense responses in plants (lima bean and corn) by exposing them to transgenic-plant-volatiles (VOCos) including (E)-β-ocimene, emitted from transgenic tobacco plants (NtOS2) that were constitutively overexpressing (E)-β-ocimene synthase. When lima bean plants that had previously been placed downwind of NtOS2 in an open-flow tunnel were infested by spider mites, they were more defensive to spider mites and more attractive to predatory mites, in comparison to the infested plants that had been placed downwind of wild-type tobacco plants. This was similarly observed when the NtOS2-downwind maize plants were infested with Mythimna separata larvae, resulting in reduced larval growth and greater attraction of parasitic wasps (Cotesia kariyai). In a greenhouse experiment, we also found that lima bean plants (VOCos-receiver plants) placed near NtOS2 were more attractive when damaged by spider mites, in comparison to the infested plants that had been placed near the wild-type plants. More intriguingly, VOCs emitted from infested VOCos-receiver plants affected their conspecific neighboring plants to prime indirect defenses in response to herbivory. Altogether, these data suggest that transgenic-plant-emitted volatiles can enhance the ability to prime indirect defenses via both plant-plant and plant-plant-plant communications.
Global COE Program: Evolution and Biodiversity, Graduate School of Science, Kyoto University, Kyoto, Japan.
Atsushi
A
Muroi
Abdelaziz
A
Ramadan
Masahiro
M
Nishihara
Masaki
M
Yamamoto
Rika
R
Ozawa
Junji
J
Takabayashi
Gen-ichiro
G
Arimura
D000080462:Acyclic Monoterpenes; D056704:Adaptive Immunity / Q000187:drug effects*; D000475:Alkenes / Q000032:analysis / Q000494:pharmacology; D000818:Animals; D007887:Fabaceae / Q000187:drug effects / Q000502:physiology; D005260:Female; D060434:Herbivory / Q000187:drug effects*; D007814:Larva / Q000187:drug effects / Q000502:physiology; D009036:Moths / Q000187:drug effects / Q000502:physiology; D057865:Plant Immunity / Q000187:drug effects*; D010944:Plants / Q000187:drug effects* / Q000235:genetics / Q000276:immunology*; D030821:Plants, Genetically Modified; D040102:Tetranychidae / Q000187:drug effects / Q000502:physiology; D014026:Nicotiana / Q000187:drug effects / Q000235:genetics / Q000502:physiology; D055549:Volatile Organic Compounds / Q000494:pharmacology*; D014863:Wasps / Q000187:drug effects / Q000502:physiology; D003313:Zea mays / Q000187:drug effects / Q000502:physiology
D000080462:Acyclic Monoterpenes; D000475:Alkenes; D055549:Volatile Organic Compounds; C443996:beta-ocimene