Diaperturate pollen in submerged aquatic monocots Althenia orientalis and Althenia filiformis (Potamogetonaceae: Alismatales)статья

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[1] Diaperturate pollen in submerged aquatic monocots althenia orientalis and althenia filiformis (potamogetonaceae: Alismatales) / E. Severova, O. Volkova, O. Demina et al. // Grana. — 2019. Reports on whether typical apertures occur in pollen of Althenia (Potamogetonaceae) are controversial. The question is of interest because relatively few submerged aquatic angiosperms possess localised apertures, and the phylogenetic placement of Potamogetonaceae suggests an ancestral nature for the inaperturate condition in this family. Pollen grains from two Eurasian-African Althenia species, A. orientalis and A. filiformis, were studied using transmission and scanning electron microscopy. The pollen in both species is diaperturate. The apertures are clearly visible, possessing a typical structure of angiosperm pollen apertures. At least in A. filiformis, a pollen tube appears in one of the two apertures. The apertures vary in shape and size. This variability can be considered as a possible evolutionary step towards an omniaperturate condition found in most other members of Alismatales with underwater pollination via an expansion of the germination area over the entire pollen surface. [ DOI ]

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