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Resistance to broomrape (Orobanche crenata) in faba bean (Vicia faba): cell wall changes associated with prehaustorial defensive mechanisms

AuthorsPérez de Luque, Alejandro ; Lozano, María Dolores ; Moreno, M. T.; Testillano, P. S. ; Rubiales, Diego
Defensive mechanisms
Orobanche crenata
Parasitic plants
Vicia faba
Issue Date5-Jul-2007
PublisherAssociation of Applied Biologists
Blackwell Publishing
CitationAnnals of Applied Biology 151(1): 89-98(2007)
AbstractBroomrapes (Orobanche spp.) are parasitic angiosperms, which attach to the roots of the hosts to take water and nutrients from them. No complete control measures are available to date, but breeding for resistance remains as one of the most feasible and environmentally friendly methods. However, the mechanisms governing the interaction between these parasites and the host are not yet well understood. We studied the cellular changes associated with the resistance to Orobanche crenata in faba bean as mechanisms involved or responsible for resistance. Two cultivars of faba bean, resistant and susceptible to O. crenata infection, were used. The evolution of the infection and the changes in the cell and tissue organisation and wall components of the host cells were followed and evaluated in both genotypes. Samples of compatible and incompatible interactions were fixed and sectioned, and specific cytochemical methods for different cell components were applied, results being analysed under light and epifluorescence microscopy. A higher proportion of O. crenata seedlings unable to penetrate the root was found on the resistant genotype. Reinforcement of cell walls by callose deposition hampers parasite penetration through the cortex. Lignification of endodermal cells prevents further penetration of the parasite into the central cylinder.
Description10 pages, 4 figures.
Publisher version (URL)http://dx.doi.org/10.1111/j.1744-7348.2007.00164.x
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