Scanning electron microscopic imaging of palynological metaphors: A case study of family Poaceae taxa

Abstract

This study highlighted the taxonomic utilization of palynological metaphors for selected members (53) of family Poaceae. Multiple microscopic technique light and scanning electrons had been employed for detailed analysis. Results reported monad pollen type in all studied 53 members, which showed its limited taxonomic value up to family level. In relation to shape of pollen both polar and equatorial views strikingly differed from each other. Like semi angular pollen observed in Dactyloctenium aegyptium (L.) Wild. whereas round-minutely irregular pollen in Lolium temulentum L. Polar and equatorial diameter also showed variation, that is, Desmostachya bipinnata (L.) Stapf. can be differentiated from Sorghum bicolor (L.) Moench on diameter variation basis. A pore characteristic does not show much qualitative variation; however pore sizes differ species to species. The most frequently scarbate sculpturing was observed in 28 species followed by verrucate. Hence it can be said that pollen shape, polar, and equatorial diameters, pore size, P/E ratio, pore sculpturing are of good taxonomic value and holds a significant position in identification and delimitation of Poaceae taxa.

Sensitization patterns to Poaceae pollen indicates a hierarchy in allergens and a lead of tropical grasses

“…14 In addition, it is impossible to clearly determine the pollination season of different grasses during aerobiological studies 15 due to the similar morphology of their pollen. 16 This, in turn, results in a special pattern of sensitization to Poaceae pollen in each population. Moreover, the list of species in the Poaceae family that can cause allergies is constantly expanding and currently it includes the pollen of 21 types of grasses.…”

“…The diagnosis and prevention of sensitization to Poaceae pollen are also complicated by the geographical distribution of individual grass species and climate change favoring the spread of subtropical grasses, such as Cynodon , in temperate climates 14 . In addition, it is impossible to clearly determine the pollination season of different grasses during aerobiological studies 15 due to the similar morphology of their pollen 16 …”

“… 14 In addition, it is impossible to clearly determine the pollination season of different grasses during aerobiological studies 15 due to the similar morphology of their pollen. 16 …”