Author:
Kobayashi Issei,Kobayashi Yuhko,Hardham Adrienne R.
Abstract
Interactions between the flax rust fungus
Melampsora lini and flax
Linum usitatissimum L. are governed by a gene-for-gene
relationship which determines pathogen virulence or avirulence and host
resistance or susceptibility. The present study demonstrates differential
sensitivity of M. lini and flax to the microtubule
depolymerising drug, oryzalin, such that microtubule depolymerisation in flax
cells but not in fungal cells could be obtained. Normally, in an incompatible
interaction, a rapid hypersensitive response about 24 h after inoculation
inhibits fungal development and invasion. However, in an incompatible
interaction in the presence of oryzalin, the occurrence of hypersensitive cell
death was delayed and its frequency reduced. This allowed a normally avirulent
race of M. lini to form haustoria in living host
mesophyll cells at a rate and efficiency similar to that achieved by a
virulent race in a compatible interaction during the first 36 h after
inoculation. After that time, the incidence of hypersensitive cell death
increased and further development of the pathogen was arrested. The results
indicate that microtubules play a role in effecting rapid and efficient
hypersensitive response in the race–cultivar specific interaction
between flax and the flax rust fungus.
Subject
Plant Science,Agronomy and Crop Science
Cited by
20 articles.
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