Süleyman Doğu | Hacettepe University (original) (raw)

Papers by Süleyman Doğu

Nordic Journal of Botany, 2009

Teucrium creticum L. and T. orientale L. var. orientale are two related taxa in Teucrium sect. Te... more Teucrium creticum L. and T. orientale L. var. orientale are two related taxa in Teucrium sect. Teucrium. In this study, the value of anatomical and micromorphological characters for distinguishing between these two taxa is analysed. Transverse sections of the stem, as well as both transverse and surface sections of the leaves were examined anatomically. According to the data obtained, collenchyma and sclerenchyma do grow more in T. creticum than in T. orientale var. orientale. The leaves of T. creticum are hypostomatic and have a characteristic hypodermis, which is under the upper epidermis, as well as abundant spherocrystals in the upper epidermis. The leaves of T. orientale var. orientale are amphistomatic, yet no spherocristals exists in epidermal cells and the hypodermis is absent. The results obtained from studies carried out under scanning electron microscope (SEM) shows that the nutlet micromorphology varies between the two taxa. In both taxa, the nutlet surfaces are reticulate and glandular. Eglandular hairs do occur. However, in T. orientale var. orientale, 20Á60 mm long eglandular hairs with scabrid surface occur only along the margins of the nutlets, whereas the 3=4 dorsal sides of the nutlets in T. creticum are all covered with 90Á500 mm long, smooth-surfaced hairs. Additionally, while the glandular hairs on the nutlets of T. creticum are subsessile, those on the nutlets of T. orientale var. orientale are capitate and distinctly stalked.

Acta Biologica Cracoviensia series Botanica, 2009

Micromorphological features related to the pollen, nutlets and trichomes of Lallemantia species g... more Micromorphological features related to the pollen, nutlets and trichomes of Lallemantia species growing in Turkey were investigated mainly by scanning electron microscopy. Lallemantia pollen shares morphological features with subfamily Nepetoideae (tribe Mentheae, subtribe Nepetinae) pollen. However, the fine details are characteristic enough to differentiate the pollen between species. The exine is microreticulate in L. peltata and L. iberica, and reticulate-foveolate in L. canescens. Similarly, nutlet features are similar in general, but there are striking differences in surface details between species. Nutlets are black and oblong-triangular with V-shaped areoles. The surface is verrucate in L. iberica and L. canescens, and verrucate-rugulate in L. peltata. The warts are regular and separated in L. peltata, irregular and separated in L. iberica, and irregular and separated or sometimes associated in 2 to 4 groups in L. canescens. Two types of trichome, capitate and acicular, are present on the stems, leaves, calyx and bracts. The results suggest that although the distribution and micromorphology of trichomes has no taxonomic value, some pollen and nutlet micromorphological characters have the potential to serve as phylogenetic markers at the species level in the genus Lallemantia. However, pollen characteristics show no correlation with the nutlet characteristics.

Biologia, 2011

Teucrium montanum L. and T. polium L. are the two closest Teucrium L. species from sect. Polium (... more Teucrium montanum L. and T. polium L. are the two closest Teucrium L. species from sect. Polium (Mill.) Schreb in Turkey. In addition, they are sympatric for some part of their range in Turkey. In this study, comparative anatomical and micromorphological studies of the two species are carried out. They have been investigated by their leaf and stem anatomical features, as well as nutlet micromorphological characteristics. The results of anatomical studies show that the anatomical characters of both taxa are observed to be similar to the general features of the family Lamiaceae anatomy, except for lacking rich collenchyma at the corners. Both taxa are similar in stem anatomy and their leaves exhibit xeromorphy. However, trichome morphology on the stems and the leaves appear to have a taxonomic value in segregation of the two taxa. Light and scanning electron microscope studies on the nutlets also show that nutlet shapes, measures and surface micromorphologies are different in the two species. Whereas nutlet surfaces are bireticulate in both species, the nutlets are larger and primary sculpturing is more distinct in T. polium than in T. montanum. Moreover, the nutlets are oblong to oblong-ovoid and larger in T. polium, but ovoid and smaller in T. montanum.

Nordic Journal of Botany, 2009

The new species Acantholimon doganii Y. Bagcı, Dogu & Akaydın is described and illustrated. Diagn... more The new species Acantholimon doganii Y. Bagcı, Dogu & Akaydın is described and illustrated. Diagnostic morphological characteristics in closely related species are discussed and the conservation status of the new species is analysed. A revised key to the Turkish Acantholimon species with persistent circinnate leaf basis is also provided.

Nordic Journal of Botany, 2009

Teucrium creticum L. and T. orientale L. var. orientale are two related taxa in Teucrium sect. Te... more Teucrium creticum L. and T. orientale L. var. orientale are two related taxa in Teucrium sect. Teucrium. In this study, the value of anatomical and micromorphological characters for distinguishing between these two taxa is analysed. Transverse sections of the stem, as well as both transverse and surface sections of the leaves were examined anatomically. According to the data obtained, collenchyma and sclerenchyma do grow more in T. creticum than in T. orientale var. orientale. The leaves of T. creticum are hypostomatic and have a characteristic hypodermis, which is under the upper epidermis, as well as abundant spherocrystals in the upper epidermis. The leaves of T. orientale var. orientale are amphistomatic, yet no spherocristals exists in epidermal cells and the hypodermis is absent. The results obtained from studies carried out under scanning electron microscope (SEM) shows that the nutlet micromorphology varies between the two taxa. In both taxa, the nutlet surfaces are reticulate and glandular. Eglandular hairs do occur. However, in T. orientale var. orientale, 20Á60 mm long eglandular hairs with scabrid surface occur only along the margins of the nutlets, whereas the 3=4 dorsal sides of the nutlets in T. creticum are all covered with 90Á500 mm long, smooth-surfaced hairs. Additionally, while the glandular hairs on the nutlets of T. creticum are subsessile, those on the nutlets of T. orientale var. orientale are capitate and distinctly stalked.

Acta Biologica Cracoviensia series Botanica, 2009

Micromorphological features related to the pollen, nutlets and trichomes of Lallemantia species g... more Micromorphological features related to the pollen, nutlets and trichomes of Lallemantia species growing in Turkey were investigated mainly by scanning electron microscopy. Lallemantia pollen shares morphological features with subfamily Nepetoideae (tribe Mentheae, subtribe Nepetinae) pollen. However, the fine details are characteristic enough to differentiate the pollen between species. The exine is microreticulate in L. peltata and L. iberica, and reticulate-foveolate in L. canescens. Similarly, nutlet features are similar in general, but there are striking differences in surface details between species. Nutlets are black and oblong-triangular with V-shaped areoles. The surface is verrucate in L. iberica and L. canescens, and verrucate-rugulate in L. peltata. The warts are regular and separated in L. peltata, irregular and separated in L. iberica, and irregular and separated or sometimes associated in 2 to 4 groups in L. canescens. Two types of trichome, capitate and acicular, are present on the stems, leaves, calyx and bracts. The results suggest that although the distribution and micromorphology of trichomes has no taxonomic value, some pollen and nutlet micromorphological characters have the potential to serve as phylogenetic markers at the species level in the genus Lallemantia. However, pollen characteristics show no correlation with the nutlet characteristics.

Biologia, 2011

Teucrium montanum L. and T. polium L. are the two closest Teucrium L. species from sect. Polium (... more Teucrium montanum L. and T. polium L. are the two closest Teucrium L. species from sect. Polium (Mill.) Schreb in Turkey. In addition, they are sympatric for some part of their range in Turkey. In this study, comparative anatomical and micromorphological studies of the two species are carried out. They have been investigated by their leaf and stem anatomical features, as well as nutlet micromorphological characteristics. The results of anatomical studies show that the anatomical characters of both taxa are observed to be similar to the general features of the family Lamiaceae anatomy, except for lacking rich collenchyma at the corners. Both taxa are similar in stem anatomy and their leaves exhibit xeromorphy. However, trichome morphology on the stems and the leaves appear to have a taxonomic value in segregation of the two taxa. Light and scanning electron microscope studies on the nutlets also show that nutlet shapes, measures and surface micromorphologies are different in the two species. Whereas nutlet surfaces are bireticulate in both species, the nutlets are larger and primary sculpturing is more distinct in T. polium than in T. montanum. Moreover, the nutlets are oblong to oblong-ovoid and larger in T. polium, but ovoid and smaller in T. montanum.

Nordic Journal of Botany, 2009

The new species Acantholimon doganii Y. Bagcı, Dogu & Akaydın is described and illustrated. Diagn... more The new species Acantholimon doganii Y. Bagcı, Dogu & Akaydın is described and illustrated. Diagnostic morphological characteristics in closely related species are discussed and the conservation status of the new species is analysed. A revised key to the Turkish Acantholimon species with persistent circinnate leaf basis is also provided.