Response to root-knot nematodes of a germplasm collection of red clover and related species

A germplasm collection of red clover (Trifolium pratense L.) and seven related species was evaluated in greenhouse tests for resistance to Meloidogyne arenaria (Neal) Chitwood, M. hapla Chitwood, M. incognita (Kofoid & White) Chitwood, and M. Javanica (Treub) Chitwood. Plants were rated for root...

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Bibliographic Details
Published in:Genetic resources and crop evolution 1997-10, Vol.44 (5), p.439-445
Main Authors: Kouame, C.N. (Institut des Savanes IDESSA, Bouake (Cote d'Ivoire)), Quesenberry, K.H, Dunn, R.A
Format: Article
Language:English
Subjects:
Collection
Egg production
Eggs
Galling
Genetic factors
GENETIC RESISTANCE
GERMOPLASMA
GERMPLASM
Inoculation
Interspecific
Interspecific hybridization
MELOIDOGYNE
Meloidogyne arenaria
Meloidogyne hapla
Meloidogyne incognita
Meloidogyne javanica
Nematodes
PEST RESISTANCE
Red clover
RESISTANCE AUX ORGANISMES NUISIBLES
Resistance factors
RESISTANCE GENETIQUE
RESISTENCIA A LAS PLAGAS
RESISTENCIA GENETICA
Species
TRIFOLIUM ALPESTRE
TRIFOLIUM PRATENSE
Worms
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Summary:A germplasm collection of red clover (Trifolium pratense L.) and seven related species was evaluated in greenhouse tests for resistance to Meloidogyne arenaria (Neal) Chitwood, M. hapla Chitwood, M. incognita (Kofoid & White) Chitwood, and M. Javanica (Treub) Chitwood. Plants were rated for root galling severity and nematode egg production at eight weeks after inoculation with 1500 nematode eggs. A resistance index, RI = √(gall2; + egg2;), was generated to assess the plants' reaction to nematode infection as immune, highly resistant, resistant, moderately resistant, intermediate, moderately susceptible, susceptible, or highly susceptible. More than 98% of red clover accessions were intermediately to highly susceptible to all four root-knot nematode species. Only one accession, PI 271627 introduced from India, had a moderate resistance level to the four nematodes tested. About one third of the T. medium accessions were resistant or highly resistant to M. arenaria, M. incognita, and M. javanica whereas more than 50% of the T. alpestre accessions were highly resistant or immune to all four nematodes species. Genetic factors for resistance to root-knot nematode could be introduced into T. pratense through interspecific hybridization with T. medium and/or T. alpestre
ISSN:0925-9864
1573-5109
DOI:10.1023/A:1008681404916