Feeding behavior of<Emphasis Type="Italic">Aphis gossypii</Emphasis> on resistant accessions of different melon genotypes (<Emphasis Type="Italic">Cucumis melo</Emphasis>) |
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| Authors: | E?Garzo C?Soria M?L?Gómez-Guillamón Email author" target="_blank">A?FereresEmail author |
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| Institution: | (1) Centro de Ciencias Medioambientales (CSIC), 28006 Madrid, Spain;(2) Centro Experimental “La Mayora”, CSIC, 29750 Algarrobo-Costa, Malaga, Spain |
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| Abstract: | The feeding behavior of the melon aphidAphis gossypii Glover (Homoptera: Aphididae) was monitored using the electrical penetration graph (EPG) technique on different melon (Cucumis melo L.) genotypes showing resistance to the aphid. The aphid-resistant genotypes used were PI-161375 and PI-414723, sources of
theVat andAgr genes, respectively. TGR-1551, a newC. melo accession from Zimbabwe, was also tested. Our goal was to localize the tissues where the resistance factors are expressed
and to determine if the resistance mechanisms operating in the three aphid-resistant accessions were the same. Our results
indicated that the three selected lines have resistant factors located at the epidermis, mesophyll and vascular tissues. However,
the behavior ofA. gossypii on TGR-1551 was different from the two other resistant accessions, as indicated by a longer phloem salivation phase (E1 phase).
Many of the E1 phases observed for aphids feeding on TGR-1551 were not followed by phloem ingestion (E2 phase). These results
suggest that TGR-1551 has a resistance mechanism that preventsA. gossypii from initiating ingestion from the phloem. Preference tests under free choice conditions also showed that aphids rejected
accessions TGR-1551 or PI-414723 faster than PI-161375. Our results support the hypothesis thatAgr andVat are coding for different kinds of resistance strategies. Comparisons of aphid life history parameters also indicated that
TGR-1551 is a very promising new source to breed for resistance againstA. gossypii.
http://www.phytoparasitica.org posting Jan. 16, 2002. |
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| Keywords: | Aphis gossypii feeding behavior EPG technique resistant melon germplasm resistance mechanism |
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