Herbivore specificity and the chemical basis of plant–plant communication in <i><scp>B</scp>accharis salicifolia</i> (<scp>A</scp>steraceae)

Moreira, Xoaquín; Nell, Colleen S.; Katsanis, Angelos; Rasmann, Sergio; Mooney, Kailen A.

doi:10.1111/nph.14164

Cited by 56 publications

(49 citation statements)

References 58 publications

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“…35 ha in the University of California San Joaquin Marsh Reserve (33°39′47″N, 117°51′7″W; CA, USA), the same field site where our past studies of this plant have been conducted (Mooney et al 2012b;Moreira and Mooney 2013;Abdala-Roberts et al 2016;Moreira et al 2016;Abdala-Roberts et al 2017). To get distinct genotypes, we collected cuttings from wildgrown plants that were separated by approximately 900 m. Cuttings were dipped in a 20% solution of Dip 'N Grow Root Inducing Concentrate (Dip 'N Grow Inc., Clackamas, OR) and planted in perlite for 6 weeks in a greenhouse.…”

Section: Genotype Selection and Propagationmentioning

confidence: 99%

Relative effects of genetic variation sensu lato and sexual dimorphism on plant traits and associated arthropod communities

et al. 2018

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Intraspecific plant trait variation can have cascading effects on plant-associated biotic communities. Sexual dimorphism is an important axis of genetic variation in dioecious plants, but the strength of such effects and the underlying mechanisms relative to genetic variation are unknown. We established a common garden with 39 genotypes of Baccharis salicifolia sampled from a single population that included male and female genotypes and measured plant traits and quantified associated arthropod communities. Genetic variation sensu lato (genotypic variation) had strong effects on most plant traits (flower number, relative growth rate, specific leaf area, percent water content, carbon-nitrogen ratio, monoterpene but not sesquiterpene concentrations) and on herbivore and predator density, and on arthropod community composition (relative abundance of 14 orders). In contrast, sexual dimorphism had weaker effects on only a few plant traits (flower number and relative growth rate), on predator density, and on arthropod community composition, but had no effect on herbivore density. Variation in flower number drove genetic variation sensu lato and sex dimorphism in predator density and arthropod community composition. There was unique genetic variation sensu lato in herbivore density (positively) associated with monoterpene concentration and in arthropod community composition associated with specific leaf area and carbon-nitrogen ratio. There was unique sexual dimorphism in arthropod community composition associated with plant relative growth rate. Together, these results demonstrate that genetic variation sensu lato and sexual dimorphism can shape plant-associated arthropod communities via both parallel and unique mechanisms, with greater overall effects of the former.

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Section: Genotype Selection and Propagationmentioning

confidence: 99%

Relative effects of genetic variation sensu lato and sexual dimorphism on plant traits and associated arthropod communities

et al. 2018

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“…We measured total emission of individual VOCs as a proportion to the internal standard (Moreira et al. ).…”

Section: Methodsmentioning

confidence: 99%

“…We chose pinocarvone because its emission significantly increased after U. macolai feeding (control, 8625.20 ± 4629.06 ng/h; U. macolai feeding, 24444.00 ± 3498.25 ng/h; Moreira et al. ) and significantly varied between plant sexes (see Results ). We also chose the treatment containing a blend of six VOCs because all these compounds were highly inducible after U. macolai feeding (Moreira et al.…”

Section: Methodsmentioning

confidence: 99%

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Specificity of plant–plant communication for Baccharis salicifolia sexes but not genotypes

Moreira

Nell

Meza-Lopez

et al. 2018

Ecology

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Plants are able to adjust their anti‐herbivore defenses in response to the volatile organic compounds (VOCs) emitted by herbivore‐damaged neighbors, and some of these changes increase resistance against subsequent herbivory. This phenomenon of plant–plant communication is thought to be widespread, but recent investigations have cautioned that it can be context dependent, including variation in the strength of communication based on the identity of plants and their associated herbivores. Here, we performed three greenhouse experiments using multiple male and female genotypes of the dioecious woody shrub Baccharis salicifolia and its specialist aphid Uroleucon macolai to test for specificity of plant–plant communication with respect to plant sex and genotype. Moreover, we evaluated plant sexual dimorphism and genotypic variation in VOC emissions (i.e., the “speaking” side of the interaction) and response of plants to VOC exposure (i.e., the “listening” side of the interaction) in order to identify the chemical mechanisms underlying such specificity. We did not find genotypic specificity of communication; emitter plants damaged by U. macolai significantly reduced subsequent U. macolai performance on receivers, but these effects were indistinguishable for communication within vs. among genotypes. In contrast, we found sex specificity of communication; male emitter plants reduced subsequent U. macolai performance on male and female receiver plants equally, while female emitter plants only did so for female receivers. We found sexual (but not genotypic) dimorphism in speaking but not listening; of the seven compounds induced by U. macolai feeding (speaking), pinocarvone was approximately fivefold greater in female than in male plants, while exposure of plants to pinocarvone emissions (listening) reduced U. macolai performance equally in both male and female plants. Together, our study demonstrates novel evidence for sexually dimorphic specificity of plant–plant communication and the chemical mechanism underlying this effect.

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“…As for phloem‐feeding herbivores, specialist and generalist aphids differentially induce direct defenses in Arabidopsis (Mewis et al, ). Whether primed plants also differentially regulate defenses against generalist and specialist herbivores after perceiving herbivore‐specific HIPVs from damaged conspecific neighbors has not received much attention (Moreira et al, ).…”

Section: Introductionmentioning

confidence: 99%

Herbivore‐specific plant volatiles prime neighboring plants for nonspecific defense responses

Timilsena

Seidl-Adams

Tumlinson

2019

Plant Cell & Environment

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Plants produce species‐specific herbivore‐induced plant volatiles (HIPVs) after damage. We tested the hypothesis that herbivore‐specific HIPVs prime neighboring plants to induce defenses specific to the priming herbivore. Since Manduca sexta (specialist) and Heliothis virescens (generalist) herbivory induced unique HIPV profiles in Nicotiana benthamiana, we used these HIPVs to prime receiver plants for defense responses to simulated herbivory (mechanical wounding and herbivore regurgitant application). Jasmonic acid (JA) accumulations and emitted volatile profiles were monitored as representative defense responses since JA is the major plant hormone involved in wound and defense signaling and HIPVs have been implicated as signals in tritrophic interactions. 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. However, HIPV‐exposed plants accumulated similar amounts of volatiles and JA independent of the combination of priming or challenging herbivore. Furthermore, volatile profiles emitted by primed plants depended only on the challenging herbivore species but not on the species‐specific HIPV profile of damaged emitter plants. This suggests that feeding by either herbivore species primed neighboring plants for increased HIPV emissions specific to the subsequently attacking herbivore and is probably controlled by JA.

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Herbivore specificity and the chemical basis of plant–plant communication in Baccharis salicifolia (Asteraceae)

Cited by 56 publications

References 58 publications

Relative effects of genetic variation sensu lato and sexual dimorphism on plant traits and associated arthropod communities

Relative effects of genetic variation sensu lato and sexual dimorphism on plant traits and associated arthropod communities

Specificity of plant–plant communication for Baccharis salicifolia sexes but not genotypes

Herbivore‐specific plant volatiles prime neighboring plants for nonspecific defense responses

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