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Differentiation Between Heterodera Rostochiensis and an Undescribed Allied Species By Female Colour, Morphometrics and Pathogenicity

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The stylets of the larvae of six populations of the golden potato cyst nematode (Heterodera rostochiensis Woll.) were shorter than the larval stylets of nine populations of the white and cream potato cyst nematode (undescribed species). The distance from the basal knobs of the stylet to the anterior end of the larva was shorter in the golden populations than in the white. The distance between the median bulb valve of the larva and the excretory pore did not differentiate the white from the golden populations. In many backcrosses, isolated major genes for resistance from S. vernei, S. spegazzinii and S. oplocense reduced cyst formation of all tested golden populations almost to zero, including the populations that reproduce on H1-resistant varieties (var. ex S. andigena CPC 1673). Some clones with isolated major genes from S. oplocense and S. vernei reduced cyst formation of certain white populations to a high degree as well. The clones 65.346/9 ex S. vernei and 61.303/34 ex S. spegazzinii differentiated the two nematode species. The differentation in many pathotypes makes breeding to the white potato cyst nematode more difficult than breeding to the golden species.

Affiliations: 1: Max-Planck-Institut für Züchtungsforschung Köln-Vogelsang, Deutschland


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