Abstract
SYNOPSIS. Octogenic reproductive cysts are transformed into resting cysts when returned to optimal temperature following prior exposure to cold (5°C) for at least 36 hours. In the cold, the reproductive process ceases and macronuclei revert to the interphase condition. Transformation to resting cysts is synchronous. Induced encystment is accompanied by excessive macronuclear extrusion and is associated with a loss in division potential, resulting in no division, or 1 or 2 divisions in the induced resting cyst.These observations support the hypothesis that exposure to cold during a critical period of the predivisional stage may alter reproductive protein synthesis and favor cyst protein synthesis. The extensive macronuclear extrusions associated with this transition suggest their biochemical involvement in the encystment process.
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