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Pollen morphology of the subfamily Salicornioideae (Chenopodiaceae s.s.) in Eurasia and North Africa

Abstract : Pollen morphology of 40 specimens of 15 species belonging to eight genera in the subfamily Salicornioideae (Chenopodiaceae), was studied using Light (LM) and Scanning Electron Microscopy (SEM) to evaluate the taxonomic importance of pollen characters. Pollen grains were characteristically pantopolyporate with31-51 evenly distributed pores on the surface. Tectum and operculum are covered with minute spinules, typical of other members of Chenopodiaceae, with minor differences among different genera and species. Perforation was only seen in Halostachys belangeriana at high magnification. Pollen characters studied in this study include pollen and pore diameters, number and density of apertures, interporal distance (chord), chord/pollen diameter ratio, pore diameter/pollen diameter ratio as well as spinule density on tectum and operculum. Despite extreme uniformity in pollen morphology there is good evidence supporting currently known phylogenetic relationships and generic delimitations within the Salicornioideae subfamily. The significant differences in pollen characters among populations of Halostachys belangeriana and Halocnemum strobilaceum may indicate genetic diversity or polyploidy in different populations. The pollen characters provide limited taxonomic value in the Salicornioideae subfamily which may come from habitat homogeneity of all species growing in hypersaline marshes and inland hygrohalophytic communities.
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Mehdi Dehghani, Morteza Djamali, Hossein Akhani. Pollen morphology of the subfamily Salicornioideae (Chenopodiaceae s.s.) in Eurasia and North Africa. Palynology, Taylor & Francis, 2020, ⟨10.1080/01916122.2020.1784304⟩. ⟨hal-02879003⟩

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