| Pak. J. Bot., 38(1): 15-28, 2006. | Back to Contents | ||||
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Updated: 09-07-09 | ||||
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A PALYNOLOGICAL STUDY OF SOME CULTIVATED TREES FROM KARACHI RUKHSHINDA AFTAB AND ANJUM PERVEEN
Abstract: The pollen morphology of 25 species belonging to 23 genera distributed
in 13 families have been examined by light microscopy and scanning electron
microscope. Generally pollen grains occur singly and rarely in polyads.
Pollen grains generally 3-colporate in families viz., Bignoniaceae,
Myrtaceae, Mimosaceae, Anacardiaceae, Apocynaceae, Caesalpiniaceae,
Caricaceae, Moringaceae, Rhamnaceae and Sapotaceae. However, in Bignoniaceae
and Myrtaceae both colporate and colpate types of pollen grains are
found. In the family Malvaceae pantoporate pollen grains are found.
The shapes of pollen grains are also different. Generally pollen grains
are sub-prolate, prolate and prolate-spheroidal, rarely oblate and spheroidal.
Tectum generally reticulate or rugulate in addition to this scabrate
and echinate. Department of Botany, University of Karachi, Karachi-75270, Pakistan. |
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