Implications on the Nature of Sporopollenin Based Upon Pollen Development

Experimental modelling of exine-like structures

“…It is known that Golgi vesicles deliver the main glycocalyx components (glycoproteins) into the microspore periplasmic space (Rowley, 1971;Pettitt & Jermy, 1974;Rowley & Dahl, 1977;Pettitt, 1979). Lipopolysaccharides are also detected in the periplasmic space as constituents of the glycocalyx (Rowley, 1975) and, in the middle tetrad stage, lipoid SP monomers also appear in the same volume.…”

Sporoderm development and substructure inMagnolia sieboldiiand other Magnoliaceae: an interpretation

“…The periplasmic space, which is an arena for sporoderm development, contains glycoproteins (Rowley, 1971;Pettitt & Jermy, ǟ Figure 6. Atypically developing microspore sporoderm and tapetal cells in Magnolia sieboldii at the middle tetrad stage.…”

Topography and Non-Topography in Exine Organization

“…This is in, conformity with results obtained in nexine-2 in Echiriops bomricirs (Stix, 1964 b). More or less transverse small hollows or channels also occur in the nexine of Epilobiirrrr 1tionlotiii1ti and Znirschrrcrin californica, another onagraceous plant (Rowley, 1970;Rowley et al, 1970). With regard to this and other circumstances not mentioned here, it seems as if the exine stratification in Epilobiiori is of the same type as,that in sample 8, Table I (S, N2; in other onagraceous pollen grains often S1, S2, N2).…”