Comparative analysis of micromorphological characters in two closely related species, Silene syreistschikowii and S. supina (Caryophyllaceae)
Journal Title: Naukovyi visnyk Chernivetskoho universytetu. Biolohiia (Biolohichni systemy) - Year 2018, Vol 10, Issue 1
Abstract
Silene syreistschikowii P. Smirn. (Caryophyllaceae) is endemic to Eastern Crimea, but its taxonomical status is interpreted ambiguously. This species is very similar in morphology to widely distributed S. supina M. Bieb. The present study aims to investigate micromorphological characters of pollen grains, seeds and leaf surface of both species using scanning electron microscopy in order to differentiate these taxa. Pollen micromorphology of both taxa is very similar and differs only in morphometric parameters. Diameter of pollen grains (S. syreistschikowii vs. S. supina) – 29.3–34.2 μm vs. 28.2–39.1 μm, number of pores – 23–32 vs. 25–33, pore diameter – 3.6–5.8 μm vs. 3.3–4.3 μm, interporal distance – 4.4–8.2 μm vs. 3.8–9.1 μm, microechinate number on the operculum – 8–22 vs. 7–20, size of exine microechinae – 0.25–0.47 × 0.33–0.69 μm vs. 0.23–0.45 × 0.37–0.68 μm, diameter of perforations on the exine – 0.15–0.54 μm vs. 0.19–0.76 μm. Seeds of these species are also very similar: seed size – 760–1020 × 960–1310 μm (S. syreistschikowii) vs. 700–1200 × 950–1490 μm (S. supina), size of distal exotesta cells on the lateral surface – 146–201 × 42–58 μm vs. 115–207 × 46–73 μm, number of teeth on anticlinal wall of this cells – 21–31 vs. 20–29, size of teeth – 10–15.1 × 8.5–12.3 μm vs. 10.9–17.2 × 8.5–14.6 μm. Differences in leaf micromorphology between studied taxa are also connected with morphometric parameters. Adaxial surface parameters (S. syreistschikowii vs. S. supina): size of epidermal cells – 40–115 × 24–105 μm vs. 36–105 × 23–73 μm, size of stomata – 31–44 × 22–34 μm vs. 32–47 × 19–37 μm, size of trichomes – 44–89 × 19–39 μm vs. 32–47 × 19–37 μm. Abaxial surface parameters: size of epidermal cells – 52–99 × 30–105 μm vs. 46–108 × 29–59 μm, size of stomata – 9–45 × 19–27 μm vs. 29–47 × 20–34 μm, size of trichomes – 58–114 × 23–43 μm vs. 31–100 × 18–61 μm. Thus, investigated taxa only slightly differ in some morphometric parameters of pollen grains (pore diameter, interporal distance, the diameter of perforations), seeds (width of distal exotesta cells on the lateral surface) and leaves (length of trichomes on both surfaces, the width of stomata on the abaxial surface).
Authors and Affiliations
V. Martyniuk, N. Karpenko, O. Tsarenko
Keywords
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- EP ID EP500802
- DOI 10.31861/biosystems2018.01.084
- Views 84
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