Pollen grain morphologies

Marrubium zeydanlii (Lamiaceae) is described as a new species from Turkey. It is similar to M. depauperatum and M. sivasense; however, it is distinguished from M. depauperatum by having lanate hairs on the stem, oblanceolate dentate leaves, 4–6-flowered verticillasters. It is also distinguished from M. sivasense by having lanate hairs on the stem, oblanceolate leaves, and shorter petals. The pollen grains are radially symmetrical and isopolar, the shape is oblate-spheroidal with the polar axes 16.7–20 µm and the equatorial axes 17.6–19.3 µm.

10p lyhuyenthu 31-01-2023 8 2   Download

This study was carried out using light microscope (LM) and scanning electron microscopy (SEM). Pollen morphology of this genus is fairly uniform. Generally radially symmetrical apolar, mostly spheroidal, pantoporate.

7p schindler 30-12-2021 8 0   Download

In this study, three new hybrids from the genus Cirsium are described for the first time. Cirsium ×nezaketiae Yıldız, Dirmenci & Arabacı, C. ×kelkitensis Yıldız, Arabacı & Dirmenci, and C. ×erzincanicum Yıldız, Dirmenci & Arabacı are investigated in detail morphologically, palynologically, and molecularly. The hybrid individuals were detected on field trips due to their intermediate morphological characters. Their morphological properties were analyzed to compare with their parents.

21p tudichquannguyet 29-11-2021 9 1   Download

Micromorphological characteristics of 13 Trifolium species, which are grown in the province of Bolu, were examined using a scanning electron microscope (SEM). The morphological characteristics determined from the study were subjected to morphometric analyses and their variation spectrums were defined. Tricolporate pollen grains showed two pollen shapes, prolate and subprolate, according to equatorial view. The smallest size of polar axis length (18.00 μm) was found in T. micranthum Viv. from section Chronosemium Ser.; the largest (88.95 μm) was found in T. hirtum All.

14p tudichquannguyet 29-11-2021 6 1   Download

Palynological characters of 20 taxa belonging to the Turkish subgenus Cyanus were studied in details using light and scanning electron microscopy. Pollen grains of the subgenus Cyanus were tricolporate or syncolporate, subprolate or prolate-spheroidal, 26.15 to 53 µm in polar size, 22.84 to 46.86 µm in equatorial size, isopolar, and radially symmetrical. The only type of pollen grain ornamentation observed was scabrate-perforate. Principal component analysis and cluster analysis were performed to investigate the relationships of the studied Cyanus taxa.

16p tudichquannguyet 29-11-2021 12 1   Download

Asperula cankiriense B.Şahin & Sağıroğlu, a new species discovered in the central Anatolian region of Turkey (Çankırı), is described herein. A. cankiriense is similar to Asperula bornmuelleri Velen. However, A. cankiriense differs mainly in its habitus, stem, leaves, and inflorescence features. In this study, the diagnostic morphological features, distribution, habitat and ecology, etymology, conservation status, and taxonomic features of the new species are discussed. Additionally, pollen micromorphological characteristics of A. cankiriense and A.

10p tudichquannguyet 29-11-2021 16 1   Download

Meiotic abnormalities lead to morphological and genetic variations which caused not only to evolution but also intraspecific reproductive barriers. During present study of detailed meiotic course in dicotyledonous plants sampled from Indian cold deserts, various meiotic abnormalities have been detected.

11p viharuno2711 24-04-2020 25 0   Download

Fourteen cucumber accessions collected from different Northeast states of India were analysed for variations by means of agro-morphological traits and palynological characteristics. Phenotypic variations in fruit length (19.20 cm – 28.33 cm, fruit width 5.0 cm – 7.3 cm), number of locules (3 – 4/fruit), seed length (0.8 cm – 1.2 cm), seed width (0.3 cm – 0.43 cm) and weight of 100 seeds (1.0 gm – 3.4 gm/ accessions) were observed. Variations were also observed in pollen characteristics among the accessions.

9p trinhthamhodang4 22-03-2020 9 1   Download

Pollen morphological and phytochemical comparative study of nine Saudi Arabian date palm (Phoenix dactylifera L.) cultivars has been carried out. Pollen grains are generally small in size, monad, hetero-polar, asymmetric, elliptic in equatorial view, mono-sulcate. Exine sculpturing is micro-reticulate. Little differences have shown in the pollen dimensions, muri thickness and lumen size. The phytochemical screening of date palm pollen grains revealed the presence of high amounts of phenolics and flavonoids and displayed good antioxidant capacity.

10p cothumenhmong3 22-02-2020 13 0   Download

The objective of this work was to study the reproductive biology in four nerium cultivars. Anthesis, anther dehiscence, stigma receptivity, flower and fruit morphology, pollen morphology and production, ovule production and pollen ovule ratio were studied. Anthesis in nerium cultivars started from 5.30 a.m. and reached the peak by 6.30 a.m. except in yellow cultivar (6.30 to 7.30 am). Nerium flowers are protandrous in nature and the anthers dehisced by longitudinal slit just before the anthesis. Anther dehiscence started at 5.30 a.m. and maximum anther dehisce was observed between 5.

16p trinhthamhodang3 12-02-2020 10 1   Download

The morphological characteristics, fertility and in vitro germination of natural tetraploid red clover (Trifolium pratense L.) pollen were examined as well as the characteristics of pollen tubes and callose formation. Pollen grains of red clover are tricolporate and usually the germination of pollen is monosphonic.

5p viminotaur2711 30-10-2019 11 0   Download

Pollen grains of 39 taxa of the genus Fritillaria L. in Turkey were examined by light and scanning electron microscopy. Detailed pollen morphological characteristics are given for these taxa. Our investigation shows that the sculpturing of the exine provides valuable characters for separating species.

20p vibasque27 27-03-2019 23 1   Download

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.

5p vibasque27 27-03-2019 18 0   Download

In this study, Sonchus erzincanicus Matthews (Asteraceae) collected from Erzincan (Turkey) has been investigated by its leaf and stem anatomical features, pollen grain characteristics and ecological features.

7p vibasque27 29-03-2019 11 0   Download

The pollen size and morphology of 20 Onobrychis Adans. taxa from Turkey were studied using both light and scanning electron microscopy. Of the taxa studied, Onobrychis fallax Freyn & Sint. and Onobrychis elata Boiss. & Balansa showed the smallest size of pollen grains, while the largest were found in Onobrychis aequidentata (Sibth. & Sm.) d’Urv.

13p vi4mua 24-02-2019 16 0   Download

The pollen grains are small (R. myconi, R. nathaliae) to medium (R. serbica) in size, ranging from 10 to 28 µm, and 3-colporate, isopolar monads with microreticulate-perforate exine. Seeds are small, 309 to 1000 µm long and 80 to 425 µm wide, elongated, with a reticulate surface and auriculate ornamentation.

14p vi4mua 24-02-2019 23 1   Download

Orbicule characteristics and pollen morphology were studied using light microscopy and scanning electron microscopy with 13 species of Oxalis section Alpinae, endemic to South America. Orbicules are either homogeneous or heterogeneous in size; surface smooth or with punctuations; margin smooth, lobed, or wavy; rounded, oblong, or irregular shapes; variable clustering.

8p vikimsa 22-02-2019 15 1   Download

This paper reports the morphological characters of 18 Iranian species of the genus Alchemilla using light and scanning electron microscopy. The pollen grains are monad, radially symmetrical, isopolar, or subisopolar, small to medium in size, triand tetracolporate, rectangular to cylindrical (from equatorial view) and triangular to circular (from polar view) in outline and prolate-spheroidal to subprolate and prolate in shape.

13p vikimsa 22-02-2019 28 1   Download

The seed and pollen grain micromorphologies of 10 taxa of the Silene sections Behenantha and Dichotomae (Caryophyllaceae) were analyzed in this study. The results showed that S. euxina can be distinguished from S. dichotoma based on morphological characteristics of their pollen grains and seeds.

12p caplock2711 21-02-2019 15 1   Download

The pollen morphology of 24 species of Compositae belonging to 18 genera was examined by light and scanning microscopy. The present data confirms the eurypalynous nature of the family. Delimitation of the genera on the basis of pollen characters is less marked. Pollen grains usually radially symmetrical, isopolar rarely apolar, tricolporate, often porate.

13p vitamix 19-02-2019 21 0   Download