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Planta 1999-Oct

Increased expression of a plant actin gene during a biotrophic interaction between round-leaved mallow, Malva pusilla, and Colletotrichum gloeosporioides f. sp. malvae.

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Prisijungti Registracija
Nuoroda įrašoma į mainų sritį
S Jin
R Xu
Y Wei
P H Goodwin

Raktažodžiai

Santrauka

Two actin genes, actA from the hemibiotrophic anthracnose fungus, Colletotrichum gloeosporioides (Penz.) Penz. & Sacc. f. sp. malvae, and act1 from its host, Malva pusilla (Sm.) were cloned from a cDNA library developed from infected host tissue. The actin gene, actA, of C. gloeosporioides f. sp. malvae, which is similar to that of other euascomycetes, appears to be expressed constitutively. The actin gene of M. pusilla is most similar to one of the actin genes of Arabidopsis thaliana that is unique in being responsive to environmental stimuli such as wounding. Expression of actA was used to follow the growth of the fungus in the plant tissue. Low actA expression occurred until 72-96 h after inoculation and then increased rapidly, corresponding with the timing of the shift from slower biotrophic fungal growth to much more rapid necrotrophic growth. In contrast, expression of act1 approximately doubled during the biotrophic phase and then rapidly declined during the necrotrophic phase. Increased host actin expression could be due to host cytoskeleton rearrangement in response to biotrophic infection, and the subsequent decrease in host actin expression could be due to host cell disruption resulting from tissue maceration during necrosis. This is the first report of a host actin gene that can increase in expression during a compatible plant-pathogen interaction.

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