Study of the Genus Tragopogon from Pakistan
Sohail Jamil Qureshi,
Abdul Ghani Awan,
Mir Ajab Khan
Pollen morphology of two different species, Tragopogon dubius and Tragopogon gracilis, belonging to genus Tragopogon of family Asteraceae was studied from Pakistan. Morphology of pollen grains of each of the species is based on specimens selected at random. Proposed characters i.e. grain, shape of pollen grain, equatorial view, polar view, equatorial diameter (E), polar diameter (P), P / E ratio, length of colpus, exine surface, exine thickness, inter poral distance, inter spinal distance, inter spinal outline, length of spines, number of spines between colpi in each species were recorded for comparison. At species level, micromorphological differences and distribution of surface pattern, shape and size of pollen have been found to exist. The pollen grains are consistently echinate, trizonocolporate but in Tragopogon dubius pollen grains are tetrazonocolporate. Maximum, equatorial view, polar view, equatorial diameter (E), polar diameter (P), P/ E ratio, length of colpus, exine surface, exine thickness, inter poral distance, inter spinal distance, inter spinal outline was observed in and Tragopogon gracilis and length of spines is maximum in Tragopogon dubius. This study demonstrates the potential of pollen studies in distinguishing some taxonomic groups in the Asteraceae.
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