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Journal of Biological Sciences

Year: 2002  |  Volume: 2  |  Issue: 2  |  Page No.: 98 - 105

Palynological Study of the Genus Sonchus from Pakistan

Sohail Jamil Qureshi, Abdul Ghani Awan, Mir Ajab Khan and Sofia Bano

Abstract

Pollen morphology of four different species, Sonchus uliginosus, S. arvensis, S. asper, S. maritimus, S. oleraceous & S. palustris, belonging to genus Sonchus 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 class, 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 grain are tetrazonocolporate. Maximum spine length, exine thickness, colpus length was observed in Sonchus uliginosus. Sonchus oleraceous has studies in distinguishing some taxonomic groups in the Asteraceae.

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