Effects of Isopropyl N-(3-Chlorophenyl) Carbamate on Suberin, Periderm, and Decay Development by Katahdin Potato Slices

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Abstract
1. Freshly cut Katahdin potato slices were dipped momentarily in suspensions containing 0, 5, 25, 50, 100, 500, or 1250 p.p.m. of isopropyl N-(3-chlorophenyl) carbamate (CIPC), and held in moist chambers at 60⚬ F. for 2, 4, 7, or 14 days, then rated for suberin and periderm development. 2. Suberin and periderm developed on all slices treated with 5 p.p.m. CIPC. At 25 p.p.m. periderm development was retarded, while at 50 p.p.m. and above periderm development was almost completely inhibited. Retardation of development of suberin was noted in some slices treated at the higher concentrations. 3. After being treated with various concentrations of CIPC, Katahdin potato slices were held 2, 4, 7, or 14 days at 60⚬ F., inoculated with cultures of Erwinia carotovora (L. R. Jones) Holland and then rated after 2 days for development of decay. More decay was found in slices held for shorter periods and in those treated with higher concentrations of CIPC. 4. When slices were held long enough after treatment with CIPC to allow extensive suberin development, bacterial infection was retarded or prevented, even though periderm did not develop.

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