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- W1663242007 abstract "Levels of individual phenolic acids were examined in primary leaves of wheat (Triticum aestivum) after inoculation with avirulent and virulent strains of the leaf rust fungus (Puccinia recondita f. sp. tritici) at stages when previous work had shown fungal and host cells to be affected by expression of the Lr20 or Lr28 alleles for resistance. The predominant phenolic acid, ferulic acid, as well as p-coumaric and syringic acids were detected in primary leaves in both unbound and bound forms. They were not detected in germinating urediniospores of either rust strain. Levels of unbound phenolic acids changed little in response to infection. In Lr28-bearing leaves inoculated with an avirulent strain, increased concentrations of bound phenolic acids and three other unidentified compounds were observed about 4 h after many single or small groups of cells had undergone hypersensitive collapse. In an Lr20-bearing cultivar, levels of bound phenolic acids fell in leaves inoculated with either a virulent or avirulent rust strain. Coniferyl aldehyde and coniferyl alcohol were not detected in healthy or inoculated leaves of either wheat cultivar. Attempts to affect expression of resistance by application of inhibitors of phenylalanine ammonia-lyase were not successful and both wheat cultivars remained resistant to avirulent rust strains. The bound phenolic acids which accumulate in cells undergoing a hypersensitive response may play a role in resistance of Lr28-bearing wheat to the leaf rust fungus." @default.
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- W1663242007 date "1990-12-01" @default.
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- W1663242007 title "Changes in phenolic acid levels in wheat leaves expressing resistance to Puccinia recondita f. sp. tritici" @default.
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- W1663242007 doi "https://doi.org/10.1016/0885-5765(90)90035-v" @default.
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