Variation in forage grasses as hosts of the root-knot nematode Meloidogyne naasi (Franklin) and selection for resistance in ryegrass |
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| Authors: | P A York R Cook |
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| Institution: | (1) AFRC Institute for Grassland and Animal Production, Welsh Plant Breeding Station, Plas Gogerddan, SY23 3EB Aberystwyth, Wales;(2) Present address: Grasslands Research Station, Private Bag, 3701 Marondera, Zimbabwe |
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| Abstract: | Summary Reactions of 13 grasses to Meloidogyne naasi varied with species; ryegrasses, fescues and their hybrids were generally susceptible and cocksfoot and timothy resistant. Marked variation in host resistance levels occurred between genotypes within cultivars.Selection of single plants, followed by tests on replicate tillers, identified resistant and susceptible genotypes in both Italian and perennial ryegrass cultivars. Resistant plants had few nematode-induced galls and fewer females and eggs than susceptibles. There was more or less continuous variation, with many genotypes intermediate between extremes of resistance and susceptibility. Selected resistant and susceptible genotypes are of use in assessing variation in nematode populations and as controls for breeding and selection programmes. |
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| Keywords: | Lolium perenne perennial ryegrass L multiflorum Italian ryegrass Festuca pratensis meadow fescue F arundinacea tall fescue Festuca × Lolium hybrids Phleum pratense timothy Dactylis glomerata cocksfoot Meloidogyne naasi root-knot nematode resistance selection |
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