[Xylanase activity of phytopathogenic and endophytic strains of Ceratocystis sp].
A comparative analysis of xylanase activity of 36 phytopathogenic and endophytic Ceratocystis sp. strains was conducted. The rate of their linear growth on the medium with xylan was studied. The rate of linear growth of phytopathogenic strains was 0.003-0.004 mm/h that was almost 70 times less than in endophytic ones. There were no correlation between levels of xylanase activity of studied strains and rates of their linear growth. Xylanase activity ofendophytic Ceratocystis sp. strains varied from complete absence to high level. Phytopathogenic strains possessed only high xylanase activity; maximum values of their xylanase activity zones were three times more than in endophytic strains. The differences in xylanase activity were observed on the strain level. The xylanase activity of 24% endophytic and 64% phytopathogenic strains became higher with increasing of cultivation period. The clear dependence of xylanase activity on the species and organs of host plants was not demonstrated. It was shown that the xylanase activity level of phytopathogenic Ceratocystis sp. strains was too much higher than in such phytopathogens as Fusarium poae, F. oxysporum and Alternaria alternata strains. The conclusion was made that the studied endophytic Ceratocystis sp. strains can be related to latent pathogens, which are able to cause the diseases of host plants in conditions favorable for them.
I M
IM
Kurchenko
O V
OV
Sokolova
O M
OM
Iur'ieva
D001203:Ascomycota / Q000201:enzymology* / Q000254:growth & development / Q000302:isolation & purification; D003470:Culture Media; D063245:Plant Development; D010935:Plant Diseases / Q000382:microbiology*; D010944:Plants / Q000382:microbiology*; D013997:Time Factors; D014455:Ukraine; D014990:Xylans / Q000378:metabolism; D014995:Xylosidases / Q000378:metabolism*
D003470:Culture Media; D014990:Xylans; D014995:Xylosidases