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Changes in melon plant phytochemistry impair Aphis gossypii growth and weight under elevated CO2
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Changes in melon plant phytochemistry impair Aphis gossypii growth and weight under elevated CO2
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Journal Article
Changes in melon plant phytochemistry impair Aphis gossypii growth and weight under elevated CO2
2021
Overview
Elevated CO
2
(eCO
2
) modifies plant primary and secondary metabolism that subsequently impacts herbivore insect performance due to changes in its nutritional requirements. This laboratory study evaluated interactions between
Aphis gossypii
Glover (Hemiptera: Aphididae) and melon (
Cucumis melo
L., Cucurbitaceae), previously acclimated two or six weeks to different CO
2
levels, eCO
2
(700 ppm) or ambient CO
2
(400 ppm). Under eCO
2
, melon plants decreased nitrogen foliar concentration and increased carbon to nitrogen ratio, independently of acclimation period, significantly reducing the content of some amino acids (alanine, asparagine, glycine, isoleucine, lysine, serine, threonine, and valine) and increasing the carbohydrate (sucrose) content in melon leaves. The dilution in some essential amino acids for aphid nutrition could have aggravated the reduction in
A. gossypii
population growth reared on melon previously acclimated two weeks to eCO
2
, as well as the loss of aphid body mass from two successive generations of
A. gossypii
reared under eCO
2
on plants previously acclimated two or six weeks to eCO
2
. The response to eCO
2
of phloem feeders, such as aphids, is actually variable, but this study highlights a negative response of
A. gossypii
to this climate change driver. Potential implications on control of this pest in a global change scenario are discussed.
