ORIGINAL ARTICLE
Pollen typification and palynotaxonomy of subfamily Salsoloideae Ulbr. (Chenopodiaceae Vent.) in the flora of South Transcaucasia
1
Institute of Botany after A. Takhtajan, National Academy of Sciences of the Republic of Armenia,
Acharyan-1, 0063, Yerevan, Armenia
Online publication date: 2022-12-14
Publication date: 2022-12-14
Acta Palaeobotanica 2022; 62(2): 93-107
HIGHLIGHTS
- Pollen morphology of 23 species from 12 genera of the Salsoloideae subfamily (Chenopodiaceae) of South Transcaucasia was investigated as well as an statistical analysis of the pollen characteristics was conducted.
- Typification of pollen within the Salsoloideae subfamily of South Transcaucasia was carried out.
- Two morphological types and four subtypes combined in two Palynogroups were distinguished.
KEYWORDS
ABSTRACT
The article presents the results of a comparative palyno-morphological analysis of the representatives
of the Salsoloideae subfamily (Chenopodiaceae) in South Transcaucasia. Out of 25 species belonging to
13 genera of Salsoloideae subfamily in South Transcaucasia, pollen morphology of 23 species from 12 genera
was investigated, as well as an analysis of the pollen characteristics was conducted. Data on five key features
of pollen (on LM level) were statistically analyzed including pollen diameter, pore number, pore diameter, exine
thickness, and mesoporium width. The results indicated that within the Salsoloideae subfamily of South Transcaucasian
flora the first three features may be considered diagnostic. The application of a scanning electron
microscope (SEM) has revealed the fourth diagnostic feature of the pollen within the Salsoloideae subfamily,
specifically, the number of spinules on the unit surface of the pollen, which enables, in several cases, to conduct
intergeneric or interspecific differentiation.
Based on the obtained data, typification of pollen within the Salsoloideae subfamily of South Transcaucasia
was carried out for the first time. As a result, two morphological types and four subtypes combined in two palynogroups
were distinguished. The subdivision into palynogroups is based on differences in the size of pollen grains.
Only species Climacoptera crassa with pollen of average sizes (26–33/29 μm in diameter) is included into the
monotypic Palynogroup I, all other investigated species with small pollen grains (10–25 (27)/22 μm in diameter)
are joined in Palynogroup II. Allocation of species into two different Types of Palynogroup II is based on the
presence of a significant difference in the size of small pollen grains of individual species. In particular, species
with relatively large pollen grains (> 20 μm in diameter) are included in Type 1, while species with relatively
small ones (≤ 20 μm in diameter) are joined in Type 2. And finally, the distribution of species into the subtypes
and variations of Palynogroup II is based on differences in pore number and size.
The identified key palyno-morphological features made it possible in some cases to specify the taxonomic
boundaries, as well as the relationship between taxa within the subfamily Salsoloideae.
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CITATIONS (1):
1.
New data on pollen morphology of the genus Camphorosma (Chenopodiaceae)
Zoya Tsymbalyuk, Sergei Mosyakin, Lyudmila Nitsenko
Acta Palaeobotanica
Zoya Tsymbalyuk, Sergei Mosyakin, Lyudmila Nitsenko
Acta Palaeobotanica
| eISSN: | 2082-0259 |
| ISSN: | 0001-6594 |
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