Cellulose in the house of the appendicularianOikopleura rufescens
- 145 Downloads
By electron diffraction analysis, highly crystalline cellulose Iβ was found in the house (a special structure in which the tunicate lives) of the appendicularianOikopleura rufescens. Cellulose microfibrils 20 nm in width were observed in a random array or highly organized with rectangular spacing of 2 to 10 (im in the house. The bundled cellulose microfibrils formed in the inlet filters, which are highly ordered meshwork structures. This paper provides the first account of the existence of cellulose in the house of an appendicularian. Our findings showed that the house and tunic are homologous tissues among the tunicates, and that the common ancestor of the tunicates (ascidians, thaliaceans, and appendicularians) already possessed cellulose-biosynthetic ability.
KeywordsAppendicularian Appendicularian house Cellulose Electron diffraction Tunicate
- Flood PR, Deibel D (1998) The appendicularian house. In: Bone Q (ed) The biology of pelagic tunicates. Oxford University Press, Oxford, pp 105–124Google Scholar
- Okamoto T, Sugiyama J, Itoh T (1996) Structural diversity of ascidian cellulose. Wood Res 83:27–29Google Scholar
- Richmond PA (1991) Occurrence and functions of native cellulose. In: Haigler CH, Weimer PJ (eds) Biosynthesis and biodégradation of cellulose. Marcel Dekker, New York, pp 5–23Google Scholar