Dikaryotization In Clitocybe Truncicola

Abstract

The process of dikaryotization in Clitocybe truncicola Peck was examined by phase-contrast microscopy. The first dikaryotic cells do not arise directly from the two homokaryotic cells that have fused but from homokaryotic cells some distance from the place of fusion. The intervening homokaryotic cells are severely disrupted and they appear to act as channels for the migrating, compatible nucleus. After a time, this nucleus ceases its migration and forms a dikaryotic association with one of the resident nuclei. From the cell containing this pair of nuclei the first dikaryotic hypha often arises. The first few conjugate divisions in this hypha are often marked by abnormal clamp connections and/or nuclear distributions. Eventually, however, the dikaryon stabilizes and later divisions are normal.