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Some Biochemical Changes in the Contents of the Cyst of Heterodera Rostochiensis During Its Maturation

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Biochemical investigation of the contents of developing cysts of H. rostochiensis showed that there is considerable free amino acid present. During maturation there are changes in the relative proportions of the different acids and a decrease in their total quantity. The changes are correlated with the activity of transaminase enzymes. L-glutamine alanine transaminase (GO-T) and L-glutamine aspartic transaminase (GP-T) are present. GO-T is most active at the yellow stage; GP-T is much less active than GO-T and its activity decreases throughout cyst maturation. The behaviour of yellow and brown pigments, and of related colourless compounds, in chromatography, electrophoresis, and other procedures, indicates their affinity with tyrosine derivatives. Although the presence of lipo-fuscin pigments was again confirmed, it is considered that the pigmentation of the contents of the developing cyst is largely due to a quinonoid substance.

Affiliations: 1: Department of Zoology, University of Newcastle upon Tyne, England


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