TITLE:
Susceptibility of Wheat Varieties to Soil-Borne Rhizoctonia Infection
AUTHORS:
Gyula Oros, Zoltán Naár, Donát Magyar
KEYWORDS:
Wheat; Rhizoctonia; Tolerance; Brown Patch; Soil-Borne; Virulence
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.4 No.11,
November
18,
2013
ABSTRACT:
Response of 19
wheat varieties cultivated in Hungary varied within large limits to soil borne Rhizoctonia infection. The most frequent symptom, usually leading to damping off was the root
neck necrosis. Four significant factors influencing the susceptibility of wheat
comprised 71% of total variation but none of them was dominant. The inhibition
of development of survivors in Rhizoctonia infested soil correlated with overall susceptibility of
variety concerned. The varieties Emese, Kikelet and Palotás are proved to be
less susceptible, but none of the varieties could be certified as tolerant. No
relationships were revealed between pathogenicity of 26 Rhizoctonia strains studied and their taxonomic position or origin.
The anamorph strains of Athelia, Ceratobasidium, Ceratorhiza and Waitea similar to Thanatephorus anamorphs
selectively infected the wheat varieties, but the syndromatic pictures were
undistinguishable with unarmed eye. R. solani was proved to be more
aggressive against germinating wheat than R. cerealis. Nine significant factors
influencing the virulence of Rhizoctonia strains comprised 82% of total variation, and six of them influenced
exclusively Thanatephorus anamorphs.