Aphid Resistance in Pisum Affects the Feeding Behavior of Pea-Adapted and Non-Pea-Adapted Biotypes of Acyrthosiphon pisum Differently
Résumé
Resistant genotypes of crops have emerged as an alternative and sustainable solution to pesticide use against pest insects. The resistance depends on the genetic diversity of the host plant and the pest species and can cause an alteration of the insect behavior. The aim of this work was to characterize the resistance level of different genotypes (one and five genotypes) to two biotypes of the aphid respectively adapted to pea and alfalfa, by measuring the individual aphid weight and analyzing aphid feeding behavior by electropenetrography (EPG). Aphid body mass was influenced by genotypes reflecting variation in their resistance level. was the most resistant to the pea biotype (ArPo28 clone) and showed intermediate resistance to the alfalfa biotype (LSR1 clone). The resistance levels of the five genotypes to the two aphid biotypes were variable and more pronounced for the alfalfa biotype. EPG data showed that ArPo28 on and LSR1 on all the genotypes spent shorter time phloem feeding compared to ArPo28 on genotypes, indicating that the resistance of genotypes to non-adapted resides in mesophyll and phloem cells. In the meantime, ArPo28 on genotypes with a different level of resistance spent a similar length of time phloem feeding, indicating that the quality of phloem sap of the resistance genotypes may not be optimal for the aphid. The study indicated that the resistance of genotypes to the two biotypes involves different genetic factors and mechanisms that affect the aphid differently.
Domaines
Sciences du Vivant [q-bio]Origine | Fichiers éditeurs autorisés sur une archive ouverte |
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