Loss of cAMP-dependent protein kinase a affects multiple traits important for root pathogenesis by Fusarium oxysporum

Hye Seon Kim, Sook Young Park, Sangwoo Lee, Elizabeth L. Adams, Kirk Czymmek, Seogchan Kang

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The soilborne fungal pathogen Fusarium oxysporum causes vascular wilt and root rot diseases in many plant species. We investigated the role of cyclic AMP-dependent protein kinase A of F. oxysporum (FoCPKA) in growth, morphology, and root attachment, penetration, and pathogenesis in Arabidopsis thaliana. Affinity of spore attachment to root surfaces of A. thaliana, observed microscopically and measured by atomic force microscopy, was reduced by a loss-of- function mutation in the gene encoding the catalytic subunit of FoCPKA. The resulting mutants also failed to penetrate into the vascular system of A. thaliana roots and lost virulence. Even when the mutants managed to enter the vascular system via physically wounded roots, the degree of vascular colonization was significantly lower than that of the corresponding wild-type strain O-685 and no noticeable disease symptoms were observed. The mutants also had reduced vegetative growth and spore production, and their hyphal growth patterns were distinct from those of O- 685. Coinoculation of O-685 with an focpkA mutant or a strain nonpathogenic to A. thaliana significantly reduced disease severity and the degree of root colonization by O- 685. Several experimental tools useful for studying mechanisms of fungal root pathogenesis are also introduced. copy; 2011 The American Phytopathological Society.

Original languageEnglish (US)
Pages (from-to)719-732
Number of pages14
JournalMolecular Plant-Microbe Interactions
Volume24
Issue number6
DOIs
StatePublished - Jun 1 2011

Fingerprint

cAMP-dependent protein kinase
Fusarium
Fusarium oxysporum
Cyclic AMP-Dependent Protein Kinases
Arabidopsis
Blood Vessels
pathogenesis
Arabidopsis thaliana
Spores
mutants
plant vascular system
Growth
Atomic Force Microscopy
spores
vascular wilt
Virulence
Catalytic Domain
atomic force microscopy
avirulent strains
cyclic AMP

All Science Journal Classification (ASJC) codes

  • Physiology
  • Agronomy and Crop Science

Cite this

Kim, Hye Seon ; Park, Sook Young ; Lee, Sangwoo ; Adams, Elizabeth L. ; Czymmek, Kirk ; Kang, Seogchan. / Loss of cAMP-dependent protein kinase a affects multiple traits important for root pathogenesis by Fusarium oxysporum. In: Molecular Plant-Microbe Interactions. 2011 ; Vol. 24, No. 6. pp. 719-732.
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Loss of cAMP-dependent protein kinase a affects multiple traits important for root pathogenesis by Fusarium oxysporum. / Kim, Hye Seon; Park, Sook Young; Lee, Sangwoo; Adams, Elizabeth L.; Czymmek, Kirk; Kang, Seogchan.

In: Molecular Plant-Microbe Interactions, Vol. 24, No. 6, 01.06.2011, p. 719-732.

Research output: Contribution to journalArticle

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