Palynological characteristics of selected Lamioideae taxa and its taxonomic significance

Abstract

Lamioideae comprised the second‐largest subfamily in Lamiaceae. Although considerable progress has recently been made in the taxonomic study of Lamioideae, the subfamily remains one of the most poorly investigated subfamily in Lamiaceae. Therefore, the present study was designed with the aim to document the pollen micromorphology of some selected Lamioideae taxa and its taxonomic significance from Pakistan. Pollen micromorphological features were observed using scanning electron microscopy. The pollen grains are monad, tricolpate, radially/bilateral symmetrical. The pollen grains were small to medium‐sized having oblate, oblate/subspheroidal, and subspheroidal shape. Exine sculpturing was observed as reticulate, microreticulate, and bireticulate. The colpus surface ornamentation was found as verrucate, gemmate, scabrate, and psilate. There was a considerable variation between the species in the micromorphology, that is, the coarseness of the reticulum, thickness of the muri comprising the reticulum and the number of secondary lumina per primary lumen. Hence, this study documented the pollen morphology of some selected taxa of the subfamily Lamioideae from Pakistan and strengthens the taxonomic identification of subfamily based on pollen characters, which helps in the correct identification, discrimination of the species of Lamioideae at generic and species level.

Comparative evaluation of the toxicological effect of silver salt (AgNO3) and silver nanoparticles on Cyprinus carpio synthesized by chemicals and marine algae using scanning electron microscopy

“…The chemically synthesized nanoparticles were cubic and spherical (Figure 2b). The SEM studies has revolutionized the bioscience and its various field to explore the ultra‐structure of nano‐particles (Saqib et al, 2020) and other plant materials as well (Ali et al, 2020; Amina et al, 2020; Ashfaq et al, 2020; Bahadur et al, 2018; Gul et al, 2019, 2020).…”

Pollen micromorphology of eastern Chinese Polygonatum and its role in taxonomy by using scanning electron microscopy

“…Pollen for SEM was prepared using the technique of (Bahadur et al, 2020; Gul et al, 2020) with little modification. Anthers were collected from mature stamens using a dissecting microscope after that transferred them on the clean slides.…”

Pollen morphological analysis of papaya (Carica papaya L.)

“…Microscopical techniques using a scanning electron microscope (SEM) have become popular to assess micromorphology of plants (Ayaz et al 2020, Lynn et al 2020, Silva-Fourny et al 2020, Gul et al 2021. Erdtman (1952) first described the pollen grains of papaya.…”