Abstract

Chloroplasts of four species of Spirogyra are examined by cytochemical methods for the possible presence of DNA. Both the Feulgen reaction and methyl green-pyronin staining indicate the presence within the chloroplast of many DNA-containing bodies.These bodies are spherical or somewhat ellipsoidal in form, approximately one micron in diameter. They are located around the pyrenoid or linearly arranged in the central zone of the chloroplast. The size and location of these bodies are somewhat different in each species.These bodies resemble the DNA-containing bodies in the chloroplast of Chlamy-domonas which were previously reported by Ris & Plaut.

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