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Behavior of Long-chain Fructosan in the Basal Top of Timothy as Influenced by N, P, and K, and Defoliation¹

An automatic gel-filtration technique was used to isolate and examine long-chain fructosan, the main watersoluble carbohydrate in the basal top tissue of timothy (Phleum pratense, L.), before and after defoliation. Timothy plants were grown on either the P- or K-deficient soil that received different rates of N, P, and K. Watersoluble carbohydrates extracted from K-deficient plants, unlike those deficient in N and P, showed an effluent pattern with an extremely low peak of long-chain fructosan and a relatively high peak of sugars. This indicated that K played an important role in the accumulation of long-chain fructosan. Defoliation sthnulated the decolnposition of long-chain fructosan to sugars without noticeable accumulation of shorter-chain fructosans. Total water-soluble carbohydrates reached a minimum level 7 days after the cutting and were restored at 16 days mainly front the accumulation of sugars. No change in the average molecular size of the long-chain fructosan was observed during accumulation and decomposition of the water-soluble carbohydrates.

Key Words: Automated gel-filtration

² Plant Physiologist, Canada Department of Agricnlture.

Received for publication February 12, 1971.