Nutrient supply induces germinal nuclear selection in exconjugants of Paramecium caudatum

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In Paramecium caudatum, whether synkaryon division products will become germinal micronuclei or somatic macronuclei is associated with their brief anteroposterior localization in the cell at the end of the third synkaryon division. The four posterior nuclei all differentiate into macronuclear anlagen. Only one of the anterior four is selected as the germinal nucleus of the next generation as the other three become degenerates. In starving exconjugant cells, more than two presumptive micronuclei were observed by staining with carbol fuchsin. In contrast, when exconjugants were supplied with the culture medium, only one of the presumptive micronuclei was observed as it divided in the exconjugant cell divisions, while the other three became pycnotic. The induction of the germinal nuclear selection process in exconjugant cells seems to be closely associated with the nutrient supply.
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