Histological observations on Uromyces phaseoli and Puccinia recondita infection in allopurinol-treated susceptible plants

The development of rust after administering allopurinol, a specific inhibitor of xanthine oxidoreductase, via roots was studied at the histological level in leaves of susceptible 'Pinto 11l' bean plants inoculated with Uromyces phaseoli and 'Thatcher', 'Mentana' and �...

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Bibliographic Details
Published in:Journal of phytopathology 1999-03, Vol.147 (3), p.163-168
Main Authors: Marte, M, Montalbini, P
Format: Article
Language:English
Subjects:
alcohol oxidoreductases
allopurinol
Biological and medical sciences
biological resistance
Chemical control
Control
enzyme inhibitors
experimental infections
Fundamental and applied biological sciences. Psychology
fungal diseases of plants
Fungal plant pathogens
growth
haustoria
histology
histopathology
hyphae
inhibition
Phaseolus vulgaris
Phytopathology. Animal pests. Plant and forest protection
Puccinia recondita
rust diseases
Triticum aestivum
Uromyces appendiculatus
Uromyces phaseoli
xanthine oxidoreductase
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Summary:The development of rust after administering allopurinol, a specific inhibitor of xanthine oxidoreductase, via roots was studied at the histological level in leaves of susceptible 'Pinto 11l' bean plants inoculated with Uromyces phaseoli and 'Thatcher', 'Mentana' and 'Leopardo' wheat plants challenged with Puccinia recondita. A marked reduction and delay in fungal growth was observed in allopurinol-treated plants starting between 24 h and 48 h post-inoculation, i.e. after differentiation of the first haustoria (onset of the biotrophic plant-parasite relationship). Infection hyphae often grew twisted and convoluted in treated hosts, sometimes producing small, irregularly shaped colonies. Differentiation of subepidermal stromata in fungal colonies was delayed and restricted by the treatment and uredospore yield severely reduced. Allopurinol administration also tended to increase the proportion of haustoria which became embedded in thick translucent sheaths during the late stages of infection. These results support the view that plant xanthine oxidoreductase activity is necessary for biotrophic development of rust fungi and suggest that the inhibition of this enzyme, which impairs the pathogen metabolism, may favour some natural host responses to attack such as haustorial sheath formation.
ISSN:0031-9481
0931-1785
1439-0434
DOI:10.1111/j.1439-0434.1999.tb03823.x