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Plant acclimation to elevated CO₂ affects important plant functional traits, and concomitantly reduces plant colonization rates by an herbivorous insect

Plant acclimation to elevated CO₂ affects important plant functional traits, and concomitantly reduces plant colonization rates by an herbivorous insect

Planta 237(1): 29-42

Plants growing under elevated CO2 concentration may acclimatize to this environmental change by modification of chemical, physiological, and/or morphological traits. As a consequence, not only plant functioning but also plant insect interactions might be altered, with important consequences particularly for agricultural systems. Whereas most studies have focused on the plant acclimation effects of elevated CO2 with regard to crop growth and productivity, acclimation effects on the behavioral response of insects associated with these plants have been largely neglected. In this study, we used a model system comprised of Brussels sprout Brassica oleraceae var. gemmifera and a specialized herbivorous insect, the cabbage aphid Brevicoryne brassicae, to test for the effects of various periods of exposure to an elevated (2 ambient) CO2 concentration on key plant functional traits and on host plant location behavior by the insect, assessed as plant colonization rates. Elevated CO2 had no measurable effect on colonization rates or total plant volatile emissions after a 2-week exposure, but it led to 15 and 26 % reductions in plant colonization rates after 6- and 10-week exposures, respectively. This reduction in plant colonization was associated with significant decreases in leaf stomatal conductance and plant volatile emission. Terpene emission, in particular, exhibited a great reduction after the 10-week exposure to elevated CO2. Our results provide empirical evidence that plants might acclimatize to a future increase in CO2, and that these acclimation responses might affect host plant choice and colonization behavior by herbivorous insects, which might be advantageous from the plant s perspective.

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Accession: 055016414

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PMID: 22968910

DOI: 10.1007/s00425-012-1750-7

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