Abstract :
[en] Climate change is a major environmental concern and is directly related to the increasing
concentrations of greenhouse gases. The increase in concentrations of atmospheric carbon dioxide
(CO2), not only a ects plant growth and development, but also a ects the emission of plant organic
volatile compounds (VOCs). Changes in the plant odor profile may a ect the plant-insect interactions,
especially the behavior of herbivorous insects. In this study, we compared the foraging behavior
of corn leaf aphid (Rhopalosiphum maidis) on barley (Hordeum vulgare L.) seedlings grown under
contrasted CO2 concentrations. During the dual choice bioassays, the winged and wingless aphids
were more attracted by the VOCs of barley seedlings cultivated under ambient CO2 concentrations
(aCO2; 450 ppm) than barley seedlings cultivated under elevated CO2 concentrations (eCO2; 800 ppm),
nymphs were not attracted by the VOCs of eCO2 barley seedlings. Then, volatile compositions
from 14-d-old aCO2 and eCO2 barley seedlings were investigated by GC-MS. While 16 VOCs were
identified from aCO2 barley seedlings, only 9 VOCs were found from eCO2 barley seedlings. At
last, we discussed the potential role of these chemicals observed during choice bioassays. Our
findings lay foundation for functional response of corn leaf aphid under climate change through host
plant modifications.
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