A Micromorphological Study on the Pollen Morphology of Astragalus stenosemioides (Fabaceae)
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Keywords:
Astragalus, Endemic, Fabaceae, Pollen Morphology, SEM, TaxonomyAbstract
The present study investigates the pollen morphological characteristics of Astragalus
stenosemioides, an endemic species with a restricted distribution in Turkey. The pollen morphology of A.
stenosemioides was examined using light microscopy (LM) and scanning electron microscopy (SEM).
The pollen grains are isopolar, radially symmetrical, and predominantly tricolporate in structure. The
pollen grains are typically observed to be prolate–spheroidal in shape. A study of thirty mature pollen
grains revealed that the polar axis (P) exhibited a range of 22.6 to 28.1 um (average 25.41 +- 1.2 um),
while the equatorial axis (E) demonstrated a range of 20.9 to 23.8 um (average 22.63 +- 0.74 um). The
average P/E ratio is 1.12. The mean exine thickness was found to be 1.02 +- 0.12 um, and the mean intine
thickness was 0.83 +- 0.08 um. SEM examinations revealed that the pollen surface exhibits perforate
ornamentation and a narrow-walled (muri) structure with an irregular lumen. The palynological data
obtained reflect the general pollen type of the Astragalus genus, but also demonstrate that A.
stenosemioides possesses distinctive micromorphological characteristics at the species level.
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