Title of article :
Chromatographic Characterization and Phytotoxic Activity of Fusarium oxysporum f. sp. albedinis and Saprophytic Strain Toxins
Author/Authors :
H. AMRAOUI، نويسنده , , H. B. LAZREK، نويسنده , , M. H. SEDRA، نويسنده , , F. SAMPIERI، نويسنده , , P. MANSUELLE، نويسنده , , H. ROCHAT and A. HAMDAOUI، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2005
Abstract :
The bayoud disease, vascular fusariosis of date palm
tree (Phoenix dactylifera L.), is caused by the pathogenic
fungus Fusarium oxysporum f. sp. albedinis. The
characteristic symptoms of the bayoud disease were
elicited on detached leaves of F. oxysporum f. sp.
albedinis-susceptible cultivars of date palm trees, which
were treated either with the FII (F. oxysporum f. sp.
albedinis) fraction purified from the organic extracts of
a F. oxysporum f. sp. albedinis liquid culture, or with a
solution of fusaric acid. Enniatins, which are secreted
by several Fusarium species, were tested at different
concentrations and were not capable of inducing
symptoms on such detached leaves. The FII (F. oxysporum
f. sp. albedinis) fraction was unable to induce necrosis
of potato slices, which indicates that it does not
contain significant amounts of enniatins. The highperformance
liquid chromatography (HPLC) profiles
of the FII (F. oxysporum f. sp. albedinis) fraction
showed toxic peaks different from fusaric acid. A fraction,
named FII (AZ4), was obtained from culture filtrates
of a saprophytic Fusarium strain maintained in
the same cultural conditions as for the F. oxysporum
f. sp. albedinis. The HPLC profile of the FII (AZ4)
fraction did not show the characteristic phytotoxic
peaks present in the FII (F. oxysporum f. sp. albedinis)
fraction. This finding well agrees with the fact that the
FII (AZ4) fraction is not toxic to detached date palm
leaves. Moreover, the HPLC profiles of FII fractions
obtained from other special forms of F. oxysporum are
different the FII (F. oxysporum f. sp. albedinis) profile.
The phytotoxic compounds purified from the FII
(F. oxysporum f. sp. albedinis) fraction are probably
new molecules that may help in understanding the
pathogenesis of bayoud disease
Keywords :
formae specials , enniatins , fusaric acid , high-performance liquid chromatographic analysis , Fusarium oxysporum saprophytic strain , Fusarium oxysporum f. sp. albedinis , Toxins
Journal title :
Journal of Phytopathology
Journal title :
Journal of Phytopathology