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Filtreler
Pollen morphology of Astragalus L. sect. Onobrychoidei DC. (Fabaceae) in Turkey [Türkiye'deki Astragalus L. cinsi Onobrychoidei DC. (Fabaceae) seksiyonunun polen morfolojisi]

Pinar N.M. | Ekici M. | Aytaç Z. | Akan H. | Çeter T. | Alan S.

Article | 2009 | Turkish Journal of Botany33 ( 4 ) , pp.291 - 303

The pollen morphology of 45 specimens of 29 species of the genus Astragalus L. of the section Onobrychoidei DC. distributed in Turkey was studied with light and electron microscopies. The pollen is generally 3-colporate. Pollen of the section is prolate, subprolate, and prolate-spheroidal. Size varies, with the polar axis ranging from 23.4 to 42.6 µm and the equatorial axis from 14.3 to 36.4 µm. The outline is elliptic or compressed oval in the meridional section, versus trilobulate and sometimes tetralobulate in the polar optical section. Sculpturing is usually microreticulate, rarely reticulate or rugulate in the meridional optica . . .l section, and psilate and perforate (with irregular or circular perforations) in the polar optical section. © TÜBİTAK Daha fazlası Daha az

Pollen morphology of Scaligeria DC. (apiaceae) in Turkey

Baldemir A. | Alan Ş. | Şahin A.A. | Paksoy M.Y. | Pinar N.M.

Article | 2018 | Turkish Journal of Botany42 ( 4 ) , pp.462 - 477

In this study, the pollen morphology of all Scaligeria DC. species distributed in Turkey were studied with light and scanning electron microscopy for the first time. The aim is to contribute to knowledge of the variation among seven Scaligeria species, which have taxonomic problems, based on pollen morphological characteristics by population analysis. The pollen is radially symmetrical, isopolar, and tricolporate in all examined species. Pollen grains are prolate and subprolate with the polar axes ranging from 18.4 to 37 µm and the equatorial axes from 9.8 to 30 µm. Their polar shapes are triangular, triangular to subcircular, circu . . .lar to subcircular, or triangular to subtriangular. Several types of exine ornamentations have been observed on pollen by scanning electron microscopy. Numerical analysis showed that pore structure, the ratio of P/E, and ornamentation in the polar and equatorial views are most valuable variables for separating the Scaligeria species. All S. lazica taxa were grouped together and S. capillifolia and S. tripartita were the external taxa due to cluster and PCA analysis. © 2018, Turkiye Klinikleri Journal of Medical Sciences. All rights reserved Daha fazlası Daha az

Daily Ambrosia pollen concentration in the air of Ankara, Turkey (1990-1999)

Kaplan A. | Sakiyan N. | Pinar N.M.

Article | 2003 | Acta Botanica Sinica45 ( 12 ) , pp.1408 - 1412

The airborne ragweed pollen spectrum was investigated in the air of Ankara, Turkey for a period of ten years (1990-1999) using a Burkard seven-day volumetric recording trap. In our study period, long distance transported Ambrosia pollen has been registered. Daily pollen levels varied from low to high in Burge's system. In last three years, the pollen concentration of Ambrosia showed a clear increasing tendency. Our results prove that ragweed pollen may be an important threat for ragweed sensitive patients in Ankara city in near future.

Seed coat ultrastructure of hard-seeded and soft-seeded varieties of Vicia sativa

Büyükkartal H.N. | Çölgeçen H. | Pinar N.M. | Erdogan N.

Article | 2013 | Turkish Journal of Botany37 ( 2 ) , pp.270 - 275

The mature seed coat structure in hard-seeded and soft-seeded varieties of Vicia sativa L. was examined by scanning and transmission electron microscopy to investigate differentiation in cytological and morphological features between these varieties. The outer layer of the seed coats was composed of macrosclereid (Malpighian) cells in the hard-seeded and soft-seeded varieties of Vicia sativa. The walls of the macrosclereid cells were thickened, and the cell vacuoles were filled with tannin. The cytoplasm of the macrosclereids contained small- and large-sized vacuoles and ribosomes, mitochondria, and endoplasmic reticulum. Under this . . . layer there was a hypodermal layer composed of osteosclereids separated by large intercellular spaces. The bottom layer consisted of parenchyma cells. Thin-walled parenchyma cells were filled with amyloplasts that contained large starch grains, protein bodies, and a few organelles. Seed size and colour are important characteristics for distinguishing between hard-seeded and soft-seeded varieties. The hard seeds of Vicia sativa are smaller than the soft seeds. © TÜBİTAK Daha fazlası Daha az

A new record for the flora of Turkey: Scorzonera ketzkhovelii Grossh. (Asteraceae)

Hamzaoglu E. | Aksoy A. | Martin E. | Pinar N.M. | Çölgeçen H.

Article | 2010 | Turkish Journal of Botany34 ( 1 ) , pp.57 - 61

Scorzonera ketzkhovelii Grossh. (Asteraceae) was recently collected from Yusufeli, Artvin (north-east Anatolia) and it has been reported as a new species record for the flora of Turkey. It is described and illustrated. In addition, its karyological features and pollen morphology are given. © TÜBİTAK.

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