Enhancement of Extensin Biosynthesis in Ageing Disks of Carrot Storage Tissue

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Abstract
Incubation of carrot root phloem parenchyma disks is accompanied by the accumulation of protein-bound hydroxyproline (extensin) in the cell wall. Freshly cut tissue disks have a low rate of extensin synthesis, and this rate greatly increases during the first 18 h of incubation. Ageing is also accompanied by an increase in the enzymatic activity of a particulate UDP-arabinose arabinosyl transferase, an enzyme involved in extensin biosynthesis, and in the capacity of the cells to transport extensin to the wall. The enhancement of extensin biosynthesis is dependent on continued RNA synthesis. The results suggest that wounding results in a de-repression of extensin biosynthesis.

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