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Résistance à Globodera pallida Pa2/3 chez Solanum sparsipilum

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For more content, see Nematologica.

Two types of resistance against Globodera pallida Pa2/3 were found in Solanum sparsipilum. The first one acted against the juveniles soon after their penetration into the roots. The juveniles were unable to develop, as are the juveniles of G. rostochiensis in resistant H1 cultivars. The second allowed the nematodes to develop but nearly all became males. These resistances acted against two very aggressive European populations of G. pallida Chavornay and Luffness but not against a Peruvian one belonging to the pathotype P6A. Segregation studies from crosses with dihaploid S. tuberosum strongly suggested the existence in S. sparsipilum of a major gene for resistance, different from Gpa4 already found in this species.

Deux types de résistance vis-à-vis de Globodera pallida Pa2/3 ont été trouvés chez Solanum sparsipilum. La première est du type hypersensible. Son action est précoce et empêche tout développement des juvéniles du deuxième stade (J2), malgré l'induction des syncytia. La seconde provoque une masculinisation massive des nématodes en développement dans les racines. Efficace vis-à-vis de deux populations européennes de G. pallida Pa2/3, Chavornay et Luffness, ces résistances sont sans effet sur une population péruvienne de G. pallida P6A. L'étude des ségrégations après croisement avec des dihaploïdes de S. tuberosum suggère fortement l'existence chez S. sparsipilum d'un gène majeur nouveau, différent du gène Gpa4 déjà trouvé chez cette espèce.


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