Pollen morphology & pollen fertility estimation of three medicinal species belonging to genus Hypericum L. from flora of Kaghan valley, Northern Pakistan was investigated by light and scanning electron microscopy ...Pollen morphology & pollen fertility estimation of three medicinal species belonging to genus Hypericum L. from flora of Kaghan valley, Northern Pakistan was investigated by light and scanning electron microscopy for the first time. The species are Hypericum elodeoides Choisy in, Hypericum oblongifolium Choisy, and Hypericum perforatum L. Pollen morphological characteristics with considerable variation are provided for these taxa. Among the studied taxa, the pollen grains were 3-4 colporate type and the largest pollen size was found in H. oblongifolium in polar view 23.0 μm and in equatorial view was 25.35 μm. The smallest pollen was of H. elodeoides in polar view which was 19.91 μm and in equatorial view was observed 12.53 μm in H. perforatum. The shape of the all pollen grain was circular to semi-angular in polar view, however in equatorial view the shape of the grains was oblate-spheroidal, in H. elodeoides, and H. oblongifolium while prolate in H. perforatum. Exine sculpturing was observed by scanning electron microscopy which showed foveolate sculpturing in H. elodeoides, reticulate in H. oblongifolium and scabrate in H. perforatum. Pollen fertility estimation ranged from 82.66% to 90.90% which shows that flora of selected species is well established.展开更多
The pollen morphology of lbur species from the genus Trigonella L. （Fabaceae） distributed in Tunisia （T. foenum-graecum, T. maritima, T. stellata and T. monspeliaca） was studied with light and scanning electron ...The pollen morphology of lbur species from the genus Trigonella L. （Fabaceae） distributed in Tunisia （T. foenum-graecum, T. maritima, T. stellata and T. monspeliaca） was studied with light and scanning electron microscope （SEM）. Results showed that the pollen morphology of these four species was not homogenous in relation to shape, dimensions and ornamentation. The pollen grains were 3-zonocolporate, radially symmetrical, isopolar, prolate to perprolate type （P/E = 1.45-2.09）. Medium in size, elliptical or rectangular-obtuse-convex in equatorial view and circular in polar view. Ectoapertures-colpi： long, medium width, with acute ends, endoapertures-pork large, circular to lolongate, protruding in mesocolpium. The rectum was reticulate to perforate reticulate with ± irregular pattern of muri, except for T. monspeliaca which ornamentation was relatively homogeneous with a loose network and psilate area. Ornamentation with lumina different in size was most clearly expressed in mesocolpium while the apocolpium and the area just along the apertures was psilate or with small scattered puncta. The exine thickness was 1.10-2.42 μtm.展开更多
文摘Pollen morphology & pollen fertility estimation of three medicinal species belonging to genus Hypericum L. from flora of Kaghan valley, Northern Pakistan was investigated by light and scanning electron microscopy for the first time. The species are Hypericum elodeoides Choisy in, Hypericum oblongifolium Choisy, and Hypericum perforatum L. Pollen morphological characteristics with considerable variation are provided for these taxa. Among the studied taxa, the pollen grains were 3-4 colporate type and the largest pollen size was found in H. oblongifolium in polar view 23.0 μm and in equatorial view was 25.35 μm. The smallest pollen was of H. elodeoides in polar view which was 19.91 μm and in equatorial view was observed 12.53 μm in H. perforatum. The shape of the all pollen grain was circular to semi-angular in polar view, however in equatorial view the shape of the grains was oblate-spheroidal, in H. elodeoides, and H. oblongifolium while prolate in H. perforatum. Exine sculpturing was observed by scanning electron microscopy which showed foveolate sculpturing in H. elodeoides, reticulate in H. oblongifolium and scabrate in H. perforatum. Pollen fertility estimation ranged from 82.66% to 90.90% which shows that flora of selected species is well established.
文摘The pollen morphology of lbur species from the genus Trigonella L. （Fabaceae） distributed in Tunisia （T. foenum-graecum, T. maritima, T. stellata and T. monspeliaca） was studied with light and scanning electron microscope （SEM）. Results showed that the pollen morphology of these four species was not homogenous in relation to shape, dimensions and ornamentation. The pollen grains were 3-zonocolporate, radially symmetrical, isopolar, prolate to perprolate type （P/E = 1.45-2.09）. Medium in size, elliptical or rectangular-obtuse-convex in equatorial view and circular in polar view. Ectoapertures-colpi： long, medium width, with acute ends, endoapertures-pork large, circular to lolongate, protruding in mesocolpium. The rectum was reticulate to perforate reticulate with ± irregular pattern of muri, except for T. monspeliaca which ornamentation was relatively homogeneous with a loose network and psilate area. Ornamentation with lumina different in size was most clearly expressed in mesocolpium while the apocolpium and the area just along the apertures was psilate or with small scattered puncta. The exine thickness was 1.10-2.42 μtm.
