Nuclear-cytoplasmic interactions in the resistance of wheat to fungal pathogens. II. Effects of cultivated and wild cereal cytoplasms on the expression of the genome of the Leningradka variety during interaction with the floury mildew pathogen
Voluevich, E.A. | Buloichik, A.A.
The quantitative resistance of three alloplasmatic and 29 substituted soft wheat lines containing the nuclear genome of the Leningradka variety to a floury mildew population was studied on a stringent infective background, by measuring the mean spore-bearing ability of the fungus per cm2 of the third and flag leaves of each plant line and the initial Leningradka variety. Dispersion analysis showed that the plant cytoplasm had a significant effect on pathogen reproduction during the ontogenetic development of wheat plants. Cytoplasms from a number of cultivated and wild species had modifying effects on the expression of the nuclear genes controlling quantitative resistance. It is suggested that a specific interaction between the fungal and host plant genomes is involved in determining quantitative resistance in the presence of cytoplasms modifying fungal reproduction during plant ontogenesis. A non-specific interaction probably occurs in the presence of cytoplasms maintaining a stable level of quantitative resistance during ontogenesis.
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