47 (5) : , ( Haliotis discus hannai Ino) (microvilli),, ( : 2, 3) (cisternae wit h elect ron2dense cores) , 7 cm, 215 % ,, L KB28800
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1 47 (5) : , 2001 A cta Zoologica S inica 3 (, ),,,,,,,, ( Haliotis discus hannai Ino), 211,, (microvilli),, ( : 2),, 6 (, ), (apical granules), , 7 cm 215 % (cisternae wit h elect ron2dense cores) 1 %, Epon812 ( : 3),, L KB28800, J EM22000EX (lipid in2 2 ( : 2, 3) ( : 2), clusions) ( : 4, 6) 3, ( ), ( ), ( : 1), ( : 5) , (No. 952A ),, 44, : E2mail : net
2 (Owen, 1970 ; 1972),, 212 (excretory cells) ( ) ( ) ;, ( : 4, : 1),, ( : 2, 3),,, ( : 1, 4) (, : 3),,, DNA ( : 2, 4) 213 (calcium cells), Dimi2,, triadis (1992), ( :, (1) 1, 5) ; (2) ; (3) ( :, 4, : 1, 4), ( Dimitriadis (1992) : 1) 214 3,, p H (intercellular junction) ;,, ( desmosome), (long2desmosome, Dl) 3 ( : 6) ( Sumner, 1965) Walker (1970), (polysaccharides), 312 ( ) 311,,,,, :
3 5 : ( ),, 585 Abolins2Krogis, A. Zoologie 18 : ( References) 1965 Electron microscope observations on calcium cells in the hepatopancreas of the snail Heli x pomatia (L. ). A rkiv F r Bickell, L. R., F. S. Chia and B. J. Crawford 1981 Morphogenesis of the digestive system during metamorphosis of the nudibranch Dori della stei nbergae ( Gastropoda) : conversion from phytoplanktivore to carnivore. Mar. Biol. 62 (1) : Cheng, Y. X., N. S. Du and W. Lai 2000 Ultrastructure of the hepatopancreatic R and F cells and lipid storage in the Chinese crab ( Eriochei r si nensis). Acta Zool. Si n. 46 (1) : [,, 2000 R F. 46 (1) : ] Cui, L. B., C. L. Liu, X. Liu and Y. H. Lu 2001 The cell type and secretion of the digestive gland in Haliotis discus hannai Ino. Acta Zool. Si n. 47 (1) : ] [ (1) : 32 Cui, L. B., C. L. Liu, X. Liu and Y. H. Lu 2001 Structure and function of mucous epithelium of the intestine in Haliotis discus hannai. Acta Zool. Si n. 47 (3) : [ (3) : ] Dimitriadis, V. K. and M. Liosi 1992 Ultrastructural localization of complex carbohydrates and phosphatases in digestive gland cells of feeding and hibernating snails, Heli x l ucorum ( Gastropoda : Helicidae). J. Moll. St ud. 58 : Li, T. W Studies on structure of hepatopancreas in Port unus t rit uberculat us. Oceanologia et L i m nologia Si nica 27 (5) : [ (5) : ] Li, T. W., J. Zhang, M. J. Ding, S. J. Wang, P. Shi, J. H. Xiang and R. Y. Liu 1997 Histology and ultrastructure of pustule disease in abalone Haliotis discus hannai. Acta Zool. Si n. 43 (3) : [,,,,,, (3) : ] Owen, G. Owen, G The fine structure of the digestive tubules of the marine bivalve Cardi um edule. Philosphical Transactions of the Royal Society of L ondon B258 : Lysosomes, peroxisomes and bivalves. Science Progress ( L ondon) 60 : Pipe, R. K. and M. N. Moore 1985 Ultrastructural changes in the lysosomal2vacuolar system in digestive cells of Mytil us edulis as a response to increased salinity. Sumner, A. T Mar. Biol. 87 : The cytology and cytochemistry of the digestive gland cells of Heli x. Quarterly Journal of Microscopical Science 106 : 173 Walker, G The cytology, cytochemistry and ultrastructure of the cell types found in the digestive gland of the slug A grioli max reticulat us (M. ). Protoplasma 71 :
4 ( Abstract) ULTRASTRUCTURE OF DIGESTIVE GLAND OF DISK ABALONE ( HAL IO TIS DISCUS HANNAI) L I Tai2Wu XU Ji2Lin DIN G Xin L IU Yan ( Key L aboratory of Mari ne Biotechnology, Ni ngbo U niversity, Ni ngbo , Zhejiang, China) The digestive gland of Disk abalone ( Haliotis discus hannai) t ransmission elect ron microscopy. ( Gast ropoda : Haliotidae) was st udied wit h The specimen of Haliotis discus hannai ( shell lengt h 7 cm) were collected f rom Dalian coast in Portions of t he digestive gland were dissected out and fixed in 215 % glutaraldehyde (011 mol/ L phosphate buffered containing 10 % sucrose ; p H 712) at 0 4 for two hours. After glutaralde2 hyde fixation, tissues were rinsed thoroughly in buffer (sucrose2adjusted, 0 4 ) and osmicated for 80 min2 utes (1 % osmium tetroxide ; phosphate buffered ; sucrose2adjusted, 0 4 ). After final rinsing, tissues were dehydrated in an et hanol series and embedded in Epon812 medium. Thin sections were cut using an L KB28800 Ultrotome and stained with uranyl acetate and lead citrate. Specimen grids were examined with J EM22000EX transmission electron microscopy ( TEM) at 100 kv. The epit helial layer of t he digestive gland of Haliotis discus hannai consisted of t hree types of cells. The first cell type was the digestive cells, which displayed two characteristic membrane structures : apical granules and cisternae with electron2dense cores, and there were many lipid droplet in the base part of the cells. The size and density of electron2dense cores in the cisternae with electron2dense cores was decreased gradually from apical to basement of t he cells. There are abundant t ubules or cisternae rough endoplasmic reticulums around t he nucleus. The nucleus, round or curved shapes, is very elect ron dense in some sections, block2like chromatin scattered in the nucleus. The second cell type is excretory cells which contain a great deal of large vacuoles in t heir cytoplasm displaying high elect ron2dense cores. There are many cisternae rough endoplasmic reticula and one Golgi s body near the nucleus. The third cell type is calcium cells which are pyramidal in shape and usually filled with concentric rings of calcium granules. In the cytoplasm of the three types of cells there are rough endo2 plasmic reticulum, f ree ribosomes, numerous mitochondria and nucleus wit h nucleoli. Key words Disk abalone ( Haliotis discus hannai), Digestive gland, Ultrastructure 3 The key project supported by the Ministry of Agriculture (No. Fishery 952A )
5 : L I Tai2Wu et al. : Ultrastructure of digestive gland of Disk abalone ( Haliotis discus hannai) Plate 1. ( Envelope of hepatopancreas) (Microvilli and apical granuls of digestive cells) (Apical granules and cisternae with electron2dense cores of digestive cells) 4. ( Two type cells, showing lipid droplet, large vacuoles etc. ) (Digestive cells) (Digestive cells in different digestive stages)
6 : L I Tai2Wu et al. : Ultrastructure of digestive gland of Disk abalone ( Haliotis discus hannai) Plate 1. ( Three type cells, showing large vacuoles, calcium granules etc. ) (Amplified excretory cells) ( Excretory cells, showing mitochondria and large vacuoles) ( Excretory cells, endoplasmic reticulum and large vacuoles) (Calcium granules in calcium cells) (Long2desmosome) Ag : (Apical granules) Cc : (Calcium cell) Ce : (Cisternae with electron2dense cores) Cg : (Calcium granules) Cm : (Circular muscle) Dc : (Digestive cells) Dl : (Long2desmosome) Ec : ( Excretory cells) Er : ( Endoplasmic reticulum) F : (Ribosomes) Ld : (Lipid droplet) Lm : (Lon2 gitudinal muscles) Lv : (Large vacuoles) M : (Mitochondria) Mi : ( Microvilli) N : ( Nucleus) Ni : (Nucleolus)
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