Abstract：
:Microtubule dynamics were examined in live cells of the fungal plant pathogen Magnaporthe grisea transformed for constitutive expression of a fusion protein containing enhanced yellow-fluorescent protein and a Neurospora crassa benomyl-resistant allele of beta-tubulin. Transformants retained their ability to differentiate appressoria and cause disease but remained sensitive to benomyl. Linear microtubule arrays and low-level cytoplasmic fluorescence were observed in vegetative hyphae, conidia, germ tubes, and developing appressoria. Fluorescence within nuclei was conspicuously absent during interphase but increased rapidly at the onset of mitosis. Treatment with either benomyl or griseofulvin resulted in the appearance of prominent brightly fluorescent aggregates, including a large aggregate near the apex, with the concomitant disappearance of most cytoplasmic microtubules. Electron microscope imaging of treated cells indicated that the aggregates lacked any obvious profiles of intact microtubules. During these treatments, hyphal tip cells continued to elongate in a nonlinear and aerial fashion at a much slower rate than untreated cells. With subsequent removal of griseofulvin, distal aggregates disappeared rapidly but the apical aggregates persisted longer. Treatment with latrunculin A caused hyphal tip swelling without apparent effect on linear microtubule arrays. Simultaneous treatment with griseofulvin and latrunculin A resulted in depolymerization of microtubules and a cessation of growth, but near-apical fluorescent aggregates were not observed.
journal_name
Protoplasmajournal_title
Protoplasmaauthors
Czymmek KJ,Bourett TM,Shao Y,DeZwaan TM,Sweigard JA,Howard RJdoi
10.1007/s00709-004-0081-3subject
Has Abstractpub_date
2005-04-01 00:00:00pages
23-32issue
1-2eissn
0033-183Xissn
1615-6102journal_volume
225pub_type
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