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Reactivity of Oesophageal Granules of Meloidogyne To Stains for Dna

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Root and stem sections from plants inoculated with second stage juveniles of Meloidogyne showed that the oesophageal lumen of the nematodes contained Feulgen positive granules (size not exceeding 1 μm). These bodies appeared smaller in juveniles than in females and were not visible in freshly hatched juveniles. They were not observed on DNAse-treated or unhydrolysed sections. Other more or less specific DNA or nucleic acid stains, e.g., Azur SO2, gallocyanin, Dapi fluorochrome and methyl green, gave either positive or less reliable results. Procedures using Giemsa or 8-hydroxyquinoline and sodium hypochlorite indicated that basic proteins may also be present at the same locations in the digestive tract. The origin of these granules which apparently are only present in nematodes feeding on the plant, in axenic or uncontrolled conditions, remains to be established.

Affiliations: 1: I.N.R.A. - Station de Recherches sur les Nématodes - 123, Boulevard Francis Meilland - 06602 Antibes (France)

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