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Evidence that elevated CO 2 reduces resistance to the European large raspberry aphid in some raspberry cultivars
Author(s) -
Martin P.,
Johnson S. N.
Publication year - 2011
Publication title -
journal of applied entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 60
eISSN - 1439-0418
pISSN - 0931-2048
DOI - 10.1111/j.1439-0418.2010.01544.x
Subject(s) - blowing a raspberry , aphid , aphididae , biology , cultivar , homoptera , rubus , horticulture , botany , pest analysis
Global climate change, such as elevated atmospheric carbon dioxide (eCO 2 ), may accelerate the breakdown of crop resistance to insect pests by compromising expression of resistance genes. This study investigated how eCO 2 (700 μmol/mol) affected the susceptibility of red raspberry ( Rubus idaeus ) to the European large raspberry aphid ( Amphorophora idaei ) Börner (Homoptera: Aphididae), using a susceptible cultivar (Malling Jewel) and cultivars containing either the A 1 (Glen Lyon) or A 10 (Glen Rosa) resistance genes. Compared to plants grown at ambient CO 2 (aCO 2 ) (375 μmol/mol), growth rates were significantly increased (ranging from 42–300%) in all cultivars at eCO 2 . There was some evidence that plants containing the A 1 gene were more susceptible to aphids at eCO 2 , with aphid populations doubling in size compared to the same plants grown at aCO 2 . Moreover, aphids grew 38% larger (1.36 mg compared with 0.98 mg) on plants with the A 1 resistance gene at eCO 2 compared with those at aCO 2 . Aphid performance on plants containing the A 1 gene grown at eCO 2 was therefore similar to that of aphids reared on entirely susceptible plants under either CO 2 treatment. In contrast, aphids did not respond to eCO 2 when reared on plants with the A 10 resistance gene, suggesting that plants with this resistance gene remained resistant to aphids at eCO 2 .