Plant landraces are an important reservoir of genetic variability, and their characterization can improve the selection of new cultivars with desired features. In this study we give a first contribution to the knowledge of Aphis craccivora Koch and Aphis fabae Scopoli performance on two landraces of Sarconi beans (local populations of Phaseolus vulgaris L. from Southern Italy), “verdolino” and “tabacchino”. We also compared aphid performance on P. vulgaris vs. Vicia faba (c.v. Aqua dulce ) because we wanted to test if the same aphid clone could utilize both plant species as a host, so being able to develop and reproduce early in the season on V. faba and then move to young Phaseolus plants. Also, we wanted to test if the different leaf trichomes density on the bean landraces could affect aphid performance. Several aphid samples of the two species were collected in the field and tested on young potted plants of both broad bean and bean landraces. Samples of A. craccivora were not able to complete the first generation on the two Phaseolus landraces tested in our study. Instead, some samples of A. fabae set up their colonies on Phaseolus plants. All A. fabae samples that survived and reproduced on P. vulgaris performed well or better on V. faba, whereas not all the samples surviving and reproducing on V. faba were able to set up on P. vulgaris. Life-history features (nymphal mortality and developmental time, adult longevity, and rm) were quantified in one of the samples that it was able to colonize Phaseolus (fab-1). Data showed a poorer performance of A. fabae on P. vulgaris than V. faba. On the last host species, A. fabae population increased to a density that caused the host plant death. On the contrary, aphid population was stable on both bean landraces and so the infested plants were able to grow and produce seeds. Aphid performance on the two landraces differed in adult longevity, shorter on “verdolino” bean, and colony survival, longer on “verdolino”.

Aphid performance on Vicia faba and two southern Italy Phaseolus vulgaris landraces

FANTI, Paolo;BATTAGLIA, Donatella
2011

Abstract

Plant landraces are an important reservoir of genetic variability, and their characterization can improve the selection of new cultivars with desired features. In this study we give a first contribution to the knowledge of Aphis craccivora Koch and Aphis fabae Scopoli performance on two landraces of Sarconi beans (local populations of Phaseolus vulgaris L. from Southern Italy), “verdolino” and “tabacchino”. We also compared aphid performance on P. vulgaris vs. Vicia faba (c.v. Aqua dulce ) because we wanted to test if the same aphid clone could utilize both plant species as a host, so being able to develop and reproduce early in the season on V. faba and then move to young Phaseolus plants. Also, we wanted to test if the different leaf trichomes density on the bean landraces could affect aphid performance. Several aphid samples of the two species were collected in the field and tested on young potted plants of both broad bean and bean landraces. Samples of A. craccivora were not able to complete the first generation on the two Phaseolus landraces tested in our study. Instead, some samples of A. fabae set up their colonies on Phaseolus plants. All A. fabae samples that survived and reproduced on P. vulgaris performed well or better on V. faba, whereas not all the samples surviving and reproducing on V. faba were able to set up on P. vulgaris. Life-history features (nymphal mortality and developmental time, adult longevity, and rm) were quantified in one of the samples that it was able to colonize Phaseolus (fab-1). Data showed a poorer performance of A. fabae on P. vulgaris than V. faba. On the last host species, A. fabae population increased to a density that caused the host plant death. On the contrary, aphid population was stable on both bean landraces and so the infested plants were able to grow and produce seeds. Aphid performance on the two landraces differed in adult longevity, shorter on “verdolino” bean, and colony survival, longer on “verdolino”.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11563/18066
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