Pollen grain and Ubisch body development in Platanus acerifolia

Comparative pollen morphology and ultrastructure ofPlatanus: Implications for phylogeny and evaluation of the fossil record

“…The deposition of the intine starts at a stage referred to as ''young pollen grains'' and is finished at the stage called ''ripe pollen'' (SuarezCervera et al, 1995). Based on the absence of proUbisch bodies in the tapetum cells and structural characteristics, we observed most of the similarities in our material to the two latest stages described by Suarez-Cervera et al (1995).…”

“…It has previously been shown that the endexine and possibly the whole exine are sensitive to acetolysis, and that features such as white lines and lamellate structures of the endexine may not be observable after acetolysis (Rowley, 1995). Suarez-Cervera et al (1995) documented the structure of the endexine of P.6acerifolia during various stages of pollen development. In the present study using nonacetolyzed material we encountered endexine conditions very similar to those documented in the ontogenetic study by Suarez-Cervera et al (1995).…”

“…A previous ontogenetic study of P.6acerifolia by Suarez-Cervera et al (1995) documented various stages of pollen development towards the mature pollen grain. The deposition of the intine starts at a stage referred to as ''young pollen grains'' and is finished at the stage called ''ripe pollen'' (SuarezCervera et al, 1995).…”

Early evolution of angiosperm pollen as inferred from molecular and morphological phylogenetic analyses

“…Hence I have scored nexine stratification as (1) rather than (?). Platanaceae: Zavada & Dilcher (1986), Suarez-Cervera et al (1995); both illustrate a thick nexine with a granular or homogeneous endexine. Proteaceae: Feuer (1986Feuer ( , 1990.…”

Ultrastructural characteristics ofBetula pendulatapetum and pollen grains after rapid freezing and freeze-substitution

“…Difference between pollen ®xed with rapid freezing and conventional chemical ®xation Many papers in the ®eld of pollen development and pollen wall ultrastructure were based on material ®xed chemically (Dahl 1986, Suarez-Cervera et al 1995, Dickinson & Potter 1976. In spite of the signi®cant results obtained from these…”