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Effects of mti-2 transgenic potato plants on the aphid Myzus persicae (Sternorrhyncha: Aphididae).

Saguez, J., Cherqui, A., Lehraiki, S., Vincent, C., Beaujean, A., Jouanin, L., Laberche, J.-C., and Giordanengo, P. (2010). "Effects of mti-2 transgenic potato plants on the aphid Myzus persicae (Sternorrhyncha: Aphididae).", International Journal of Agronomy, 2010(Article ID 653431). doi : 10.1155/2010/653431  Access to full text


Protease inhibitors are part of plant defences that have shown insecticidal effects against a wide range of insect taxa whenoverexpressed in transgenic plants. We transformed potato internodes with the mustard trypsin inhibitor mti-2 gene. Amongthe 35 independent transgenic potato lines obtained via Agrobacterium tumefasciens transformation, four (DM6, DM7, DM11, and DM19) were selected for their high level of MTI-2 (at least to 30% of trypsin activity inhibition). Feeding assays were carriedout to evaluate their effects on life history parameters of the green-peach aphid, Myzus persicae (Sternorrhyncha: Aphididae). Prereproductive period, nymphal mortality, adult fecundity, and doubling time of M. persicae populations were monitored onnontransformed potato plants (NT) and the four selected DM lines. Compared to NT plants, DM19 did not induce any effecton M. persicae. In contrast, DM7 and DM11 increased nymphal survival by approximately 20%. DM6 and DM11 lines slightlyenhanced M. persicae daily fecundity and intrinsic rate of natural increase, leading to a reduction of the doubling time of thepopulations by 1 day. DM6 did not impact nymphal mortality, whereas with the DM11 almost all the nymphs survived. Ourresults show that potato plants transformed with the mti-2 gene variably affect the life history of M. persicae but did not show anyinsecticidal effect on the aphid.

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