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AOBPreview originally published online on May 2, 2007
Annals of Botany 2007 99(6):1223-1229; doi:10.1093/aob/mcm058
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© The Author 2007. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Ecotypes of the Model Legume Lotus japonicus Vary in their Interaction Phenotypes with the Root-knot Nematode Meloidogyne incognita

H. L. Cabrera Poch1,*, R. H. Manzanilla López1 and S. J. Clark2

1 Plant–Pathogen Interactions Division
2 Biomathematics and Bioinformatics Division, Rothamsted Research, Harpenden AL5 2JQ, UK

* For correspondence. E-mail hector.cabrera{at}bbsrc.ac.uk

Received: 28 November 2006    Returned for revision: 30 January 2007    Accepted: 9 February 2007    Published electronically: 2 May 2007

Background and Aims: Knowledge of host factors affecting plant–nematode interactions is scarce. Here, relevant interaction phenotypes between a nodulating model host, Lotus japonicus, and the endoparasitic root-knot nematode Meloidogyne incognita are assessed via a genetic screen.

Methods: Within an alpha experimental design, 4-week-old replicate plants from 60 L. japonicus ecotypes were inoculated with 1000 nematodes from a single egg mass population, and evaluated for galling and nematode egg masses 6 weeks after inoculation.

Key Results: Statistical analysis of data for 57 ecotypes showed that ecotype susceptibilities ranged from 3·5 to 406 galls per root, and correlated strongly (r = 0·8, P < 0·001, log scale) with nematode reproduction (ranging from 0·6 to 34·5 egg masses per root). Some ecotypes, however, showed a significant discrepancy between disease severity and nematode reproduction. Necrosis and developmental malformations were observed in other infected ecotypes.

Conclusions: The first evidence is provided of significant variability in the interactions between L. japonicus and root-knot nematodes that may have further implications for the genetic dissection and characterization of host pathways involved in nematode parasitism and, possibly, in microbial symbiosis.

Key words: Genetics, Lotus japonicus, nematode parasitism, plant–nematode interactions, susceptibility factors


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