Abstract:
Root and crown rot of wheat is caused by
the fungus
Gaeumannomyces graminis
var.
tritici
. "Take
-
all" is an important disease affecting wheat, and its incidence has been
reported in several provinces of Iran. To identify resistant cultivars, bread wheat
germplasm should be evaluated. To evaluate b
read wheat germplasm in response to
Iranian isolate fungus (T
-
41) of
Gaeumannomyces
graminis
var.
tritici
, 333 genotype of
bread wheat, collected from different locations of Iran and other countries were evaluated
to take
-
all in greenhouse conditions. Two
experiments were conducted, the first with 89
and the second with 244 genotypes. The measured traits were amount of root and crown
infection, disease intensity, wet and dry biomass, and height of shoots. Analysis of
variance and means comparison for the pa
rameters indicated that in the first experiment,
two genotypes were resistant to the disease, and the rates of disease intensity in these
genotypes were 0.13 and 0.06. In the second experiment, five completely resistant
genotypes were identified with disea
se intensity ratings of '0'. The identified resistant
genotypes screened from both experiments were re
-
evaluated, and the results were the
same. Mean comparison between winter and spring types for dry weight and disease
intensity showed that winter wheat i
s more resistant than spring type. The results of this
research showed that there is resistance resource to take
-
all (T
-
41 isolate), in this
germplasm.
Since the experiment was conducted in greenhouse conditions, these
genotypes should be tested against th
is disease in infected conditions at field.
Keywords:
Evaluation, Root rot,
Spring and winter wheat, T
-
41 isolate.
