Some aspects of resistance to and tolerance of potato cyst nematodes in potato = Enkele aspecten van resistentie tegen en tolerantie van aardappelcysteaaltjes in aardappel

F.K. Arntzen

Research output: Thesisexternal PhD, WU

Abstract

<p>Potato cyst nematodes (PCN), <em>Globodera rostochiensis</em> and <em>G. pallida</em> , are major pests of the potato. In this thesis, research on some aspects of resistance to and tolerance of PCN is presented. The distinction of virulence groups with a hierarchical clustering procedure is proposed as an alternative for the currently distinguished pathotypes. Resistance in potato cultivars should be expressed in a quantitative way, tested against PCN populations representative of virulence groups. A previously unknown major gene for resistance to some <em>G. pallida</em> populations was found, thought to be derived from <em>S.</em><em>tuberosum</em> ssp. <em>andigena</em> CPC 1673. Several potato cultivars appeared to carry this gene, presumably due to linkage of this gene with a trait they have been selected for. Several genotypes with <em>G. pallida</em> resistance from <em>S. vernei</em> , as currently used in potato breeding, appeared to be highly intolerant to <em>G. pallida</em> . Differences in tolerance between <em>G. pallida</em> resistant genotypes in the field were associated with differences in biomass of infested plants in the greenhouse, relatively early in growth. In progenies of crosses, tolerance and resistance appeared not to be related. Selection for tolerance in a <em>G. pallida</em> resistance breeding programme is advised, in order to avoid the development of resistant, but highly intolerant potato cultivars. Multiple regression analysis revealed that the tolerance of the tested genotypes was associated with the induced rate of hatching and the capacity of root growth after infection.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
Supervisors/Advisors
  • Parlevliet, J.E., Promotor
  • van der Wal, A.F., Promotor
Award date17 May 1993
Place of PublicationS.l.
Publisher
Print ISBNs9789054851165
Publication statusPublished - 1993

Keywords

  • plant breeding
  • disease resistance
  • pest resistance
  • solanum tuberosum
  • potatoes
  • plant pests
  • pratylenchus
  • heteroderidae
  • tylenchidae

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