PJB-2010-383
POLLEN MORPHOLOGY OF SELECTED POLYGONUM L. SPECIES (POLYGONACEAE) FROM PAKISTAN AND ITS TAXONOMIC SIGNIFICANCE
GHAZALAH YASMIN1*, MIR AJAB KHAN1 AND NIGHAT SHAHEEN1
Abstract
Pollen morphology of 12 species belonging to the genus Polygonum L., (Polygonaceae) from Pakistan has been investigated by light and scanning electron microscopy. Polygonum L., is an eurypalynous genus and four types of surface ornamentation (granulate, granulate-coarsely reticulate, dimorphic exine and variable pattern of ornamentation in polar and equatorial view) have been observed under scanning electron microscope. The variation in exine ultrastructure makes it possible to distinguish four pollen types (Patulum type, Plebijum type, Cognatum type and Avicularia type). Pollen morphology within the genus proved to be useful for the specific delimitation.
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