Electron Microscope Observations on Intranuclear Paracrystals in Some Pteridophyta

Comportement D'Une Formation Cytoplasmatique du Mégasporocyte enBupleurum

“…L'inclusion paracristalline de B. canescens montre quelque ressemblance, dans sons ultrastructure et au moins sous certaines incidences de coupe, avec des formations paracristallines retrouvees dans le cytoplasme ou dans le noyau ou dans quelque organite de cellules vegetales (THORNTON et THI-MANN 1964;LANCE-NOUGAREDE 1965;LEMOINE 1966;LANCE-NOUGA-REDE 1966;PRICE et THOMSON 1967;WRISCHER 1967;}ENSEN et VAL-DOVINOS 1967;WEINTRAUB, RAGETLI et VETO 1968;VILLIERS 1968;BAIN 1968;BEHNKE 1969;WoLKEN 1969;ZEE 1969;}ENSEN et BowEN 1970;WERGIN, GRUBER et NEWCOMB 1970;GRILLI 1970;PALANDRI 1970;CARNIEL 1970;FABBRI et MENICANTI 1970;BEHNKE 1971;Tu, MALHOTRA et PRASAD 1971;UNZELMAN et HEALEY 1972).…”

Ultrastructural and Cytochemical Observations on Fibrillar Intranuclear Inclusions in the Family Campanulaceae

“…Several authors have described other types of intranuclear inclusions in both plant and animal cells, and their proteinaceous composition has been repeatedly demonstrated as well (GENEVES and VINTEJOUX 1967;FABBRI and MENICANTI 1970;PERRIN 1970;WEINTRAUB et al 1971;UNZELMAN and HEA-LEY 1972;ARSANTO 1973;RE.NAUDIN and CAPDEPON 1977;THOMAS and GauR-ANTON 1979;VINTEJOUX 1984).…”

The Occurrence of Intranuclear Inclusions in the Labiatae, Verbenaceae and Scrophulariaceae

“…Their proteic nature, known for a long time, has been repeatedly demonstrated in the last 15 years by means of both enzymatic digestion (GENEVES and VINTEJOUX 1967;FABBRI and MENICANTI 1970;CARNIEL 1970;PERRIN 1970;WEINTRAUB et al, 1971;UNZELMAN and HEALEY 1972;ARSANTO 1973;RENAUDIN and CAPDEPON 1977), and autoradiographic studies (THOMAS and GouRANTON 1979).…”

“…Cl-type -inclusions with crystalline structure (period 100-120 A), shaped like more or less regular polygons (reducible in space to polyhedrons), whose dimensions greatly vary in the different species. This type of inclusion is constant in the most evolved taxa of Pteridophyta (FABBRI and MENICANTI 1970;FABBRI and MoRASS! BoNZI 1981) and, in our study, it has been found in some genera of Labiatae, such as Calamintha and Sature;a (Fig.…”

“…BEHNKE had already studied them in 1969; today they are investigated in some 1800 species Since the last century, it has been known that nuclear inclusions are present in some angiosperm families (ZIMMERMANN 1893a, b). More recently, they have been found in many species of Pteridophyta -with constant shape and substructure in the investigated genera -thanks to the electron microscope (FABBRI and MENICANTI 1970). Investigations at the electron microscope level of families of Angiosperms are few in number (GENEVES and VrNTEJOUX 1967;AMELUXEN and GrELE 1968;WEINTRAUB eta/.…”