PJB-2006-2
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.
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