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Histological and histochemical studies on the formation of statoblasts of a fresh‐water bryozoan, Pectinatella gelatinosa
Author(s) -
Mukai Hideo
Publication year - 1973
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1051410404
Subject(s) - cytoplasm , acid phosphatase , yolk , alkaline phosphatase , biology , annulus (botany) , cell , microbiology and biotechnology , glycogen , vesicle , anatomy , biochemistry , enzyme , botany , membrane , ecology
Abstract The course of the statoblast formation in Pectinatella gelatinosa was divided into four stages and studied histologically and histochemically. The bottom of the cystigenous cup is a center of cystigenous cell differentiation and the peripheral zone of the inner cystigenous layer turns to the outer cystigenous layer as the cystigenous cup grows. The annulus is formed by migration and transformation of the outer cystigenous cells. During early stages, the yolk cells have an intensely pyroninophilic or RNA‐rich cytoplasm. The cytoplasmic pyroninophilia then diminishes as the amount of yolk granules increases. Several kinds of yolk substances occur in the mature statoblast. During statoblast formation glycogen appears first, then glycoprotein and finally neutral unsaturated lipid. Acid phosphatase activity is associated with granular structures in the cytoplasm. In the cystigenous vesicle, acid phosphatase activity is low and confined to the apical extremity of the cell. Histochemically detectable alkaline phosphatase activity is not involved in the formation of the statoblast.