Journal Article

Hypersensitive response to <i>Aphis gossypii</i> Glover in melon genotypes carrying the <i>Vat</i> gene

Emilio Sarria Villada, Elisa Garzo González, Ana Isabel López-Sesé, Alberto Fereres Castiel and María Luisa Gómez-Guillamón

in Journal of Experimental Botany

Published on behalf of Society for Experimental Biology

Volume 60, issue 11, pages 3269-3277
Published in print July 2009 | ISSN: 0022-0957
Published online May 2009 | e-ISSN: 1460-2431 | DOI: http://dx.doi.org/10.1093/jxb/erp163
Hypersensitive response to Aphis gossypii Glover in melon genotypes carrying the Vat gene

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Aphis gossypii Glover causes direct and indirect damage to Cucumis melo L. crops. To decrease the harmful effects of this pest, one of the most economically and environmentally acceptable options is to use genetically resistant melon varieties. To date, several sources of resistance carrying the Vat gene are used in melon breeding programmes that aim to prevent A. gossypii colonization and the subsequent aphid virus transmission. The results suggest that the resistance conferred by this gene is associated with a microscopic hypersensitive response specific against A. gossypii. Soon after aphid infestation, phenol synthesis, deposits of callose and lignin in the cell walls, damage to the plasmalemma, and a micro-oxidative burst were detected in genotypes carrying the Vat gene. According to electrical penetration graph experiments, this response seems to occur after aphid stylets puncture the plant cells and not during intercellular stylet penetration. This type of plant tissue reaction was not detected in melon plants infested with Bemisia tabaci Gennadius nor Myzus persicae Sulzer.

Keywords: Cotton aphid; Cucumis melo L.; EPGs; resistance; susceptibility

Journal Article.  5920 words.  Illustrated.

Subjects: Plant Sciences and Forestry

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