Pollen Morphology on Some Crassulaceae DC.

Shehata, Azza A.; Taia, Wafaa K.; Shiha, Mona A.; Eltelet, Safaa A.M.; Salim, Mohamed A.

doi:10.21608/ejbo.2023.187059.2226

	Pollen Morphology on Some Crassulaceae DC.
Egyptian Journal of Botany
Article 26, Volume 63, Issue 3, September 2023, Page 1101-1111 PDF (2.11 MB)
Document Type: Regular issue (Original Article)
DOI: 10.21608/ejbo.2023.187059.2226
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Authors
Azza A. Shehata¹; Wafaa K. Taia¹; Mona A. Shiha²; Safaa A.M. Eltelet²; Mohamed A. Salim ³
¹Department of Botany, Faculty of Science, Alexandria University, Alexandria, Egypt
²Department of Biology, Faculty of Education and Geology, Alexandria University, Alexandria, Egypt
³Department of Botany, Faculty of Science, Ain Shams University, Cairo, Egypt
Abstract
Crassulaceae (orpine or stonecrop family) is a morphologically diverse and systematically complex Angiosperm family with a cosmopolitan distribution. A detailed description of the range of pollen morphological variation within the family has been presented, to resolve the taxonomic confusion between members of this family. palynological investigation of 19 species representing nine genera of Crassulaceae were studied using both light (LM) and scanning electron microscopy (SEM). The aim of the present study was to find out the taxonomic significance of palyno-morphological characteristics in family Crassulaceae. A comparative pollen analysis was accomplished based on pollen size, shape, polar and equatorial views, polar and equatorial diameter ratio (P/E ratio), aperture characters and exine features. Generally, the pollen grains were found to be monad, isopolar, radially symmetric, prolate-spheroidal, subprolate or prolate in equatorial view, triangular, tetragonal, or pentagonal in polar view. There are three different types of apertures encountered in the examined species. These types ranged from tricolporate, tetra- and penta- colporate pollen grains. Clear variation of tectum sculpture pattern was also observed, mostly rugulate/ foveolate and rarely striate. According to tectum sculpturing pattern, three major pollen types were recognized: Crassula type, Echeveria type and Kalanchoe type. Based on the overall characteristics of pollen grains, some combinations of pollen morphological characters can reliably delimitate genera, while others are unique to some species. Additionally, based on qualitative pollen morphological characters, an identification key for main pollen types was provided.
Keywords
Crassulaceae; Morphology; Pollen grains; SEM


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