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Although protoplast fusion is of current interest because of its possibilities in pure and applied genetics, only a few reports exist on intraspecific fusion between fungal protoplasts and subsequent selection of heterokaryons. Naturally-occurring fusion between protoplasts of Geotrichum candidurn (Ferenczy, Kevei & Zsolt, I 974) and Aspergillz4s nidulans (Ferenczy, Kevei & Szegedi, I 975) has been reported. Binding & Weber (1974) described fusion between protoplasts of Phycomyces blakc~slceanus induced by seawater or calcium ions at high pH, but the frequency of heterokaryon formation was low in all cases. We here report heterokaryon formation, at high frequency, after induced intraspecific fusion between protoplasts of auxotrophs of Penicillium chryosogiwim, P . putulurn, P. roquejortii, A. nidulans, A . niger and Cephalosporium acrernonium, and fusion between protoplasts of P. chrysogenu~?z and P. rzotutunz auxotrophs, using solutions containing polyethylene glycol (PEG) mol.wt. 6000.

Induced Fusion of Fungal Protoplasts following Treatment with Polyethylene Glycol