Abstract:
: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.
journal_name
Plantajournal_title
Plantaauthors
Klaiber J,Najar-Rodriguez AJ,Piskorski R,Dorn Sdoi
10.1007/s00425-012-1750-7subject
Has Abstractpub_date
2013-01-01 00:00:00pages
29-42issue
1eissn
0032-0935issn
1432-2048journal_volume
237pub_type
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