Sohail Jamil Qureshi
Department of Biological Sciences, Ouaid-e-Azam University Islamabad, Pakistan
Abdul Ghani Awan
Department of Biological Sciences, Ouaid-e-Azam University Islamabad, Pakistan
Mir Ajab Khan
Department of Biological Sciences, Ouaid-e-Azam University Islamabad, Pakistan
Sofia Bano
Department of Biological Sciences, Ouaid-e-Azam University Islamabad, Pakistan
ABSTRACT
Pollen morphology of four different species, Crepis flexuosa, Crepis multicaulis, Crepis sancta and Crepis thomsonii, belonging to genus Crepis of family Asteraceae were studied from Pakistan. Morphology of pollen grains of each of the species is based on 20 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 and 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 and trizonocolporate. Maximum equatorial diameter, polar diameter and colpus length was observed in Crepis multicaulis while in Crepis flexuosa spine length and exine thickness is found top be maximum. Inter poral distance is minimum in Crepis flexuosa. Inter spinal distance & P/E ratio is higher in Crepis thomsonii. This study demonstrates the potential of pollen studies in distinguishing some taxonomic groups in the Asteraceae.
PDF References Citation
How to cite this article
Sohail Jamil Qureshi, Abdul Ghani Awan, Mir Ajab Khan and Sofia Bano, 2002. Palynological Study of the Genus Crepis from Pakistan. Asian Journal of Plant Sciences, 1: 182-187.
DOI: 10.3923/ajps.2002.182.187
URL: https://scialert.net/abstract/?doi=ajps.2002.182.187
DOI: 10.3923/ajps.2002.182.187
URL: https://scialert.net/abstract/?doi=ajps.2002.182.187
REFERENCES
- Bolick, M.R., 1978. Taxonomic, evolutionary and functional considerations of composite pollen ultrastructure and sculpture. Plant Syst. Evol., 130: 209-218.
CrossRefDirect Link - Chaturvedi, M., 1971. Pollen grains of Saccharum robustum brandes and Jesw. ex grassl. Grana, 11: 87-90.
CrossRefDirect Link - Clark, W.D., K.B. Gregory and A.M. Richard, 1980. Pollen morphology of haplopappus and related genera (Compositae-Astereae). Am. J. Bot., 67: 1391-1393.
Direct Link - Ehrlich, H.G., 1958. Electron microscope studies of Saintpaulia ionantha Wendl. pollen walls. Exp. Cell Res., 15: 463-474.
PubMedDirect Link - Ehrlich, H.G. and J.W. Hall, 1959. The ultrastructure of eocene pollen. Grana, 2: 32-35.
CrossRefDirect Link - Elisens, W.J., 1986. Pollen morphology and systematic relationships among new world species in the tribe Antirrhineae (Scrophulariaceae). Am. J. Bot., 73: 1298-1311.
Direct Link - El-Ghazaly, G., 1980. Palynology of hypochoeridinae and scolyminae (Compositae). Opin. Bot., 58: 1-48.
Direct Link - Grant, C.A., 1972. A scanning electron microscope survey of some Maydeae pollen. Grana, 12: 177-184.
Direct Link - Larson, D.A. and C.W. Lewis, 1961. Fine structure of parkinsonia aculeata pollen 1. The pollen wall. Am. J. Bot., 48: 934-943.
Direct Link - Page, J.S., 1978. A scanning electron microscope survey of grass pollen. Kew Bull., 32: 313-319.
Direct Link - John, R.R., 1959. The fine structure of the pollen wall in the commelinaceae. Grana, 2: 3-31.
CrossRefDirect Link - John, R.R., 1960. The exine structure of cereal and wild type grass pollen. Grana, 2: 9-15.
CrossRefDirect Link - Tomb, A.S., D.A. Larson and J.J. Skvarla., 1974. Pollen morphology and detailed structure of family compositae, tribe cichorieae: 1 Subtribe stephanomeriinae. Am. J. Bot., 6: 486-498.
Direct Link - Zahur, M.S., A.A. Bhutta and M. Ashra, 1975. A polynalogical studies of the plants growing in Punjab. B: Seasonal variation in the frequencies of air born pollen and spores which cause Allargies and Asthma with special reference to central Punjab. Final Res. Rep. Pak. Sci. Found. PPu/Bio., 6: 173-173.