Pollen Morphology of Malvaceae in Iran: A Case Study to Complete Pollen Atlas of Iran

Document Type : Original Article

Authors

1 Department of Biology, Faculty of Science, Lorestan University, Khorramabad, Iran

2 Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, Tehran, Iran

Abstract

The pollen grains of 34 species of eleven genera belonging to three subfamilies (Malvoideae, Grewioideae, Tilioideae) of Malvaceae were studied by scanning electron microscopy (SEM). Pollen grains of the studied taxa were radially symmetrical and principally spheroidal, except Grewia makranica Rech.f. & Esfand (prolate), Tilia cordata Miller, and Tilia rubra Dc. (suboblate). Apertures included tricolporate (Tilia cordata and Tilia rubra) to pantaporate (Malvella sherardiana L., Malva verticillate L., Malvalthaea transcaucasica (sosn.) Iljinand Alcea sulphurea (Boiss. & Hohen). Sculpturing was comprised of echinate, microechinate, baculate, granulate, and perforate types. Some qualitative traits in pollen grains are unique to one or a few genera. The observed variations in pollen characteristics are very useful for the delimitation of subfamilies and in some cases are generic specific but these characters are not functional in separating taxa at a specific level or distinguishing suggested species groups in some genera such as Alcea L.. Our results add further support to the current classification of Malvaceae which recognizes the subfamilies Tilioideae, Grewioideae, and Malvoideae but there was no character state in pollen grains to be synapomorphic for Malveae, Hibisceae, and Gossypieae. On the other hand, our results support the separation of Alcea from Althaea. The PCA analysis represents two clades. The first clade contains both subfamilies Grewioideae and Tilioideae. The second clade contains all genera belonging to the subfamily Malvoideae The resulting study emphasizes that some palynological characteristics represent high systematic value, so can be useful for systematic differentiation of Malvaceae. However, palynological evidence along with other characteristics, can be effective in solving the systematic challenges of this family.

Keywords

References

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Plant, Algae, and Environment
Volume 7, Issue 2
2023
Pages 1093-1110

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