. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. (Hexose phosphate) CHLOROPLA5T IN ANIMAL CELL Galactose i \ (UDP-Glucose epimerase) Glucose -NH (Transaminase) Giucosamine Galactosamine Amino acids & Sulphate. (UDP-Glucose dehydrogenase) (Glucuronicacid) PEDAL MUCUS GLAND FIGURE 4. Schematic representation of a hypothetical pathway of carbohydrate moving between symbiotic chloroplasts and the pedal mucus gland of I ridacliia crisputa. Enzymes or intermediates in parenthesis have not been identified in the animals studied. Pathways indi- cated by dotted lines represent
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. (Hexose phosphate) CHLOROPLA5T IN ANIMAL CELL Galactose i \ (UDP-Glucose epimerase) Glucose -NH (Transaminase) Giucosamine Galactosamine Amino acids & Sulphate. (UDP-Glucose dehydrogenase) (Glucuronicacid) PEDAL MUCUS GLAND FIGURE 4. Schematic representation of a hypothetical pathway of carbohydrate moving between symbiotic chloroplasts and the pedal mucus gland of I ridacliia crisputa. Enzymes or intermediates in parenthesis have not been identified in the animals studied. Pathways indi- cated by dotted lines represent alternative possibilities as indicated by data from Tridachiella and Placobranchus. DISCUSSION The distribution of photosynthetically fixed 14C in Tridachia, Tridachiella and Caitlerpa shows marked differences. There could be two reasons for this observation. First, the metabolism of the chloroplasts could become modified in symbiosis and secondly, fixed 14C released by symbiotic chloroplasts may be con- verted to animal products which are different from those of the plant. Modification of chloroplast metabolism in animal hosts is suggested by the obser- vation that, in the animals, only trace quantities of 14C are detected in monogalactosyl and digalactosyl digylcerides, while in Caulcrpa, a larger proportion of fixed 14C incorporated into lipid is found in the galactolipids. This may indicate that less chloroplast membrane synthesis occurs in the slugs over a six hour period than in the plant. This interpretation would be consistent with the reduced chlorophyll synthesis by chloroplasts in slugs observed by Trench and Smith (1970) if the assumption that chloroplast growth and replication is directly correlated with chlorophyll and galactolipid synthesis is tenable (see Boasson and Laetsch, 1969; Constantopoulos, 1970).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of thes
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
