[Morphological variability of the wheat powdery mildew in the context of its parasitic adaptation to the lines of wheat Aegilops with different resistance].
We studied the interaction between the pathogen and wheat-Aegilops lines with different resistance as well as their parental forms in the course of powdery mildew infection using scanning electron microscopy. Line 51/99i proved to be similar to the parental form, Rodina variety, by the infection progress. The both genotypes featured pronounced adhesion of the primary infection structures to the surface of the plant epidermal cells in addition to formation of large developed colonies of the fungus, which indicates the partners compatibility. Development of powdery mildew on line 135/99i was similar to that on the parental form Aegilops speltoides K-389. The interaction between the partners featured decelerated incubation period. Rare parasite colonies formed from mycelial hyphae with multiple hyphal lobes and usually disturbed adhesion to the surface of the epidermal cells were observed. Such pattern of the pathogen development points to the resistance factors in these plant hosts, mostly, at the level of pathogen penetration. The types of resistance of lines 95/99i and 56/99i were not specific for the parental form Ae. speltoides K-389 but rather for Ae. speltoides specimens from other natural ranges (Ryabchenko et al., 2002). This suggests that Ae. speltoides has a polygenic immune potential with the elements inheritable by the hybrids irrespective of the used resistance donor.
Riabchenko
A S
AS
Tsitsin Main Botanical Gardens, Russian Academy of Sciences, ul. Botanicheskaya 4, Moscow, 127276 Russia.
Serezhkina
G V
GV
Mishina
G N
GN
Andreev
L N
LN
D001203:Ascomycota / Q000235:genetics / Q000472:pathogenicity* / Q000648:ultrastructure; D020022:Genetic Predisposition to Disease; D014644:Genetic Variation; D006824:Hybridization, Genetic; D008854:Microscopy, Electron; D010935:Plant Diseases / Q000235:genetics / Q000382:microbiology*; D019441:Plant Epidermis / Q000382:microbiology* / Q000648:ultrastructure; D014908:Triticum / Q000235:genetics / Q000382:microbiology* / Q000648:ultrastructure