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Relation between phenol metabolism and stem rust resistance in wheat



Relation between phenol metabolism and stem rust resistance in wheat



Phytopathology 52(7): 657-664



Seedling wheat leaves infected with stem rust accumula phenolic compounds. The speed of phenol accumulation is in correla tion with infection type. Resistant reactions are associated with a consistently faster accumulation of phenolics. By contrast, no clear- cut correlation exists between the stem rust resistance and phenol content of wheat varieties in the preinfectional state. Susceptible combinations accumulate reducing substances, mainly ascorbic acid. In resistant combinations the level of ascorbic acid decreases. De- hydrogenases are activated in and around the infection court. The increase in activity is marked in susceptible and slight in resistant combinations, as shown by the in vivo application of the triphenyl tetrazolium chloride (TTC) technique. The pentose phosphate cycle enzymes (glucose-6-phosphate dehydrogenase and 6-phosphogluconatdehydrogenase) generating triphosphopyridine nucleotide (TPNH) are particularly active in rusted wheat. The results are interpreted from the point of view of the theory that the hypersensitive reaction is associated with the upset of the normal balance between oxidation and reduction.

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