PJB-2019-886
POLLEN MORPHOLOGY OF FAMILY ROSACEAE IN KABAL VALLEY SWAT PAKISTAN
Shujat Ali
Abstract
Systematic studies based on pollen morphology of 40 species representing 13 genera of the family Rosaceae including Cotoneaster, Duchesnea, Fragaria, Filipendula, Malus, Prunus, Potentilla, Pyrus, Rosa, Cydonia, Geum, Rubus and Sorbaria have been investigated. The study is based on field collected specimens from wild habitats throughout tehsil Kabal and also some species from herbarium specimens collected in recent years. Both qualitative and quantitative features of pollen grains have studied such as length of polar axis (L), equatorial diameter (E), exine thickness, and shape in polar and equatorial view, number and type of apertures, exine sculpturing pollen type and class and P/E ratio were examined. Results of the studies show that pollen in the investigated genera were tri-colporate, tri-zonocalporate and rarely tricolpate. Pollen grains were monad, radially symmetrical, iso-polar, prolate, sub-prolate, prolate-spheroidal, and rarely oblate-spheroidal. The polar axis (L) length varied from (11.25 to 51.25) and equatorial diameter (E) varied from (8.75 to 62.5). The largest length of polar axis (51.25) μm and equatorial diameter (62.5) μm were observed in Prunus persica. The smallest length of polar axis (16.25) μm and equatorial diameter (8.75) μm were observed in Cotoneaster affinis Lindl. The P/E ratio ranged varied from (0.82-1.88) and exine thickness from (0.75 to 3.75). However the pollen morphological features of Fillipendula ulmaria was completely different from previous study. Although the basic differences emerged in polar axis and equatorial axis (size of pollen grain), as well as in the P/E ratio. Polar axis range from (16.26 to 20) μm and equatorial diameter range from (11.25 to 17.50) μm, and P/E ratio was (1.28). Pollen type was tri-calporate to tri-porate, pollen class was sub-prolate, and exine ornamentations was striate. Although our investigative pollen morphological data shows a vast difference among the genera and species level
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