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The uridine diphosphate sugar pools were analyzed in young wheat plants at the three leaf stage in which the distal half of the second leaf was uniformly infected with Puccinia striiformis. Whereas UDP-glucose did not change significantly, UDP-N-acetylglucosamine, the precursor of fungal chitin synthesis, was very low in the control and the healthy proximal part of the infected second leaf but increased markedly (250 nmol per g dry weight) in the infected distal half. Of the nucleosides only uridine increased in the infected distal half which was interpreted to indicate a recycling of the UDP moiety of the chitin precursor. Inorganic phosphate determinations showed a strong accumulation not only in the infected distal half but also in the healthy proximal part of the infected second leaf.

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