Filtreler
Filtreler
Bulunan: 65 Adet 0.001 sn
Koleksiyon [20]
Tam Metin [2]
Yayın Türü [2]
Yazar [20]
Yayın Yılı [18]
Konu Başlıkları [20]
Yayın Dili [3]
Dergi Adı [11]
Contribution on the flora of Zonguldak/Turkey

Sarıbas, Metin | Kaplan, Ayşe

Article | 2008 | Biological Diversity and Conservation1 ( 1 ) , pp.40 - 65

Bu araştırma Zonguldak ili sınırları içinde gerçekleştirilmiştir. Haziran 1999- Aralık 2004 yılları arasında araştırma alanındaki 119 istasyondan 473 bitki örneği toplanmıştır. Bu örneklerin değerlendirilmesi sonucunda 105 familyaya ait 294 cins, 366 tür 53 alt tür, 31 varyete ve kültivar saptanmıştır. Bu 473 taksondan 85’i A4 karesinde ilk kez belirlenmiştir. Teşhisi yapılan türlerin 16’sı Pteridophyta divizyosuna, 457’si ise Spermatophyta divizyosuna aittir. Spermatophyta divizyosuna ait taksonların 37’si Gymnospermae, 420’si ise Angiospermae alt divizyosuna aittir. Angiospermae alt divizyosundan 420 tür Dicotyledonae, 33 tür ise . . .Monocotyledonae sınıfına aittir. Alandaki endemik tür sayısı 7 ( % 1,52 ) dir. Tanısı yapılan türlerin 90’nı ( % 19,50 ) Avrupa-Sibirya elementi; 37’si ( % 7,82 ) Akdeniz elementi, 3’ü ( 0,63 ) İran-Turan elementi ve 346’sı ise (72,05 ) çok bölgeli veya fitocoğrafik bölgesi bilinmeyendir. En çok tür içeren familyalar sırasıyla, Rosaceae ( 38 ) tür, Leguminosae ( 34 tür ), Compositae (26 tür), Labiatae ( 20 ) tür, Pinaceae (18 tür), Scrophulariaceae ( 16 tür ). En çok tür içeren cinsler Quercus ( 9 tür ), Mentha ( 7 species), Campanula (6 tür ), Cupressus (5 tür), Verbascum ( 3 tür). This investigation has been made in Zonguldak Province. 473 plants were collected from the research area at 119 station in the years between June of 1999- Decembre of 2004, 294 genera, 336 species, 43 sub-species, 31 varietes and 7 cultivars belonging to 105 families were determined. 85 of 473 taxa have been collected for the first time in A4 square. Đn analyzed species, 16 species are belonging to Pteridophyta diviso and 457 species belonging to Spermatophyta divisio. Were indicated 37 species belonging to Spermatophyta divisio are Gymnospermae while 420 are belonging to Angiospermae subdivisio. 420 species belonging to Angiospermae subdivisio are Dicotyledonae whereas 33 species are Monocotyledonae. The number of endemic species in research are is 7 ( 1,52 % ). According to geografical regions of species, 90 ( 19,50 % ) are Euro-Siberian element, 37 ( 7,49 % ) are Mediterranean element, 3 ( 0,63 % ) are Irano-Turanien element and 346 ( 72,5 % ) are poly regional or species whose phytogeographic regions are unknown. The families with the largest number of species respectively are Rosaceae (38 species ), Leguminosae (34 species ), Compositae ( 26 species ), Labiatae ( 20 species ), Pinaceae ( 18 species), Scrophulariaceae ( 16 species). The genera including the higest number of taxa are Quercus ( 9 species ), Mentha ( 7 species ), Campanula ( 6 species ), Cupressus (5 species), Verbascum ( 3 species ) Daha fazlası Daha az

Distribution and conservation of Acomys cilicicus (Mammalia: Rodentia) in Turkey

Çetintaş, Ortaç | Matur, Ferhat | Sözen, Mustafa

Article | 2017 | Turkish Journal of Zoology41 ( 6 ) , pp.1059 - 1068

Acomys cilicicus is endemic to Turkey and known from a very restricted area. The exact distribution of the species was not known up to now and the IUCN status of the species was Data Deficient (DD). To determine the exact distribution area of the species, 39 localities within the historical distribution were surveyed by using 3243 Sherman traps between 2013 and 2016. Turkish spiny mouse samples were obtained from 14 of these 39 localities and the current distribution of the species was determined. We found that the Turkish spiny mouse has two isolated populations in the area between Silifke and Erdemli with a total distribution area . . . of about 104.5 km 2 , extending from sea level up to 510 m a.s.l. Population trend estimates showed a steep decline in the last 20 years from 21.42 to 2.75 as trap night index value. These data, along with the decline in habitat quality and continuing threats to the species, merit an IUCN status of Critically Endangered (CR). The main threats for this species are habitat loss due to urbanization, new motorway construction, stone quarry development, conversion of Mediterranean shrublands into agricultural fields, and afforestation. For conservation purposes, a species protection action plan is necessary immediately. Acomys cilicicus is endemic to Turkey and known from a very restricted area. The exact distribution of the species was not known up to now and the IUCN status of the species was Data Deficient (DD). To determine the exact distribution area of the species, 39 localities within the historical distribution were surveyed by using 3243 Sherman traps between 2013 and 2016. Turkish spiny mouse samples were obtained from 14 of these 39 localities and the current distribution of the species was determined. We found that the Turkish spiny mouse has two isolated populations in the area between Silifke and Erdemli with a total distribution area of about 104.5 km 2 , extending from sea level up to 510 m a.s.l. Population trend estimates showed a steep decline in the last 20 years from 21.42 to 2.75 as trap night index value. These data, along with the decline in habitat quality and continuing threats to the species, merit an IUCN status of Critically Endangered (CR). The main threats for this species are habitat loss due to urbanization, new motorway construction, stone quarry development, conversion of Mediterranean shrublands into agricultural fields, and afforestation. For conservation purposes, a species protection action plan is necessary immediately Daha fazlası Daha az

Wild-growing Rosa heckeliana Tratt.: phenolic constituents with cytotoxic and antioxidative properties

Çoruh, Nursen | Özdoğan, Nizamettin

Article | 2017 | Turkish Journal of Biology41 ( 1 ) , pp.195 - 212

Rosa heckeliana, as one of the wild-growing species of the family Rosacea, has a wide use in the folk medicine; however, scientifically there is very little known about it. Our objective was to examine the antioxidative and antiproliferative properties of Rosa heckeliana root extract and its phenolics. The phenolic constituents, namely catechin, caffeic acid, and ellagic acid, were obtained by the methods of extraction, fractionation, and purification through column chromatography. The DPPH and ABTS radical scavenging assays and total flavonoid content analysis were employed as the current antioxidant methods over the crude extract . . .and fractionated parts. Among the extracts/fractions, the ethyl acetate fraction exhibited the highest amount of flavonoid content (4.58 ± 0.018 µg CE/ mg of extract). The ethyl acetate fraction also displayed high antioxidative properties for DPPH (EC50 value: 2.78 ± 0.01 µg/mL) and ABTS scavenging capacities (586 ± 6.64 µM trolox as TEAC value). Additionally, the antiproliferative properties of the crude extract and the ethyl acetate fraction and its isolated constituents were evaluated for two breast cancer cell lines (MCF-7 and MDA-MB-231) using the XTT method. Acetate fraction over the cells of MCF-7 and MDA-MB-231 resulted in ED50 values of 61.18 ± 0.99 µg/mL and 62.54 ± 2.01 µg/mL, respectively. The isolated phenolic constituents were twice as effective as the ethyl acetate fraction on both MCF-7 and MDA-MB-231 cells. Rosa heckeliana, as one of the wild-growing species of the family Rosacea, has a wide use in the folk medicine; however, scientifically there is very little known about it. Our objective was to examine the antioxidative and antiproliferative properties of Rosa heckeliana root extract and its phenolics. The phenolic constituents, namely catechin, caffeic acid, and ellagic acid, were obtained by the methods of extraction, fractionation, and purification through column chromatography. The DPPH and ABTS radical scavenging assays and total flavonoid content analysis were employed as the current antioxidant methods over the crude extract and fractionated parts. Among the extracts/fractions, the ethyl acetate fraction exhibited the highest amount of flavonoid content (4.58 ± 0.018 µg CE/ mg of extract). The ethyl acetate fraction also displayed high antioxidative properties for DPPH (EC50 value: 2.78 ± 0.01 µg/mL) and ABTS scavenging capacities (586 ± 6.64 µM trolox as TEAC value). Additionally, the antiproliferative properties of the crude extract and the ethyl acetate fraction and its isolated constituents were evaluated for two breast cancer cell lines (MCF-7 and MDA-MB-231) using the XTT method. Acetate fraction over the cells of MCF-7 and MDA-MB-231 resulted in ED50 values of 61.18 ± 0.99 µg/mL and 62.54 ± 2.01 µg/mL, respectively. The isolated phenolic constituents were twice as effective as the ethyl acetate fraction on both MCF-7 and MDA-MB-231 cells Daha fazlası Daha az

Karyological and some morphological characteristics of Spalax leucodon Nordmann, 1840 (Mammalia: Rodentia) superspecies around Kastamonu Province, Turkey

Sözen, Mustafa | Sevindik, Murat | Matur, Ferhat

Article | 2006 | Turkish Journal of Zoology30 ( 2 ) , pp.205 - 219

Körfare Spalax leucodon Nordmann, 1840 üzerinde yapılan bu araştırmada Kastamonu çevresindeki 18 lokaliteden 98 örneğin karyolojisi ve morfolojisi incelendi. Kastamonu çevresinden incelenen körfare populasyonlarının 2n = 54, NF = 72; 2n = 56, NF = 74; 2n = 58, NF = 74; 2n =60, NF = 74 değerlerine sahip oldukları belirlendi. Bu karyolojik sonuçlara göre kromozom morfolojileri bakımından Kastamonu çevresinden belirlenen 2n = 56, 2n = 58 ve 2n = 60 kromozom sayıları Türkiye'deki Spalax leucodon için yeni değerlerdir. Bu populasyonların diploid kromozom sayıları Türkiye'den coğrafik olarak uzak bazı bölgelerde daha önce belirlendiği içi . . .n bu çalışmada belirlenen değerleri aynı kromozom sayısına ancak farklı kromozom morfolojilerine sahip diğer formlardan ayırmak için 2n = 56N, 58N ve 60N olarak isimlendirildiler. t-testi analizleri sonucunda bütün kromozomal formların diploid kromozom sayıları yanında çok sayıda karakter ölçüsü bakımından da birbirlerinden ayrılabilmesi Spalax kromozomal formlarının ayrı biyolojik türler olarak değerlendirilmesi gerektiği şeklindeki yaklaşımı desteklemektedir. The karyotypes and morphology of 98 specimens of the subterranean mole rat Spalax leucodon Nordmann, 1840 across 18 localities in and around Kastamonu province were analysed. It was determined that S. leucodon has 2n = 54, NF = 72; 2n = 56, NF = 74; 2n = 58, NF = 74; 2n =60, NF = 74 in the populations from the Kastamonu region. According to these karyological findings based on chromosome morphology the diploid chromosome numbers of 2n = 56, 2n =58, and 2n = 60 determined here are new for Spalax leucodon in Turkey. Because diploid numbers of these populations were formerly found from geographically distant localities in Turkey, they were given as 2n = 56N, 58N, and 60N, to differentiate them from the other forms having the same diploid chromosome numbers but different chromosome morphology. As a result of t-test analysis, separation of all chromosomal forms from each other beside 2n values by many character measurements supported the opinion that each of the chromosomal forms of Spalax should be evaluated as good biological species Daha fazlası Daha az

Two new varieties of Ctenidium molluscum (Hedw.) Mitt., (Hypnaceae, Musci) for the moss flora of Turkey

Uyar, Güray

Other | 2003 | Turkish Journal of Botany27 ( 3 ) , pp.227 - 229

Batı Karadeniz Bölgesinden toplanan karayosunu örneklerinin değerlendirilmesi sonucu, Türkiye Karayosunları Florası için iki yeni varyete olan Ctenidium molluscum (Hedw.) Mitt. var. condensatum (Schimp.) Britt. ve Ctenidium molluscum (Hedw.) Mitt. var. robustum Boul. taksonları bulundu. Two new varieties, Ctenidium molluscum (Hedw.) Mitt. var. condensatum (Schimp.) Britt. and Ctenidium molluscum (Hedw.) Mitt. var. robustum Boul. collected from the western Black Sea region were determined to be new records for the moss flora of Turkey.

Ultrastructural observations in somatic embryogenesis ofnatural tetraploid Trifolium pratense L.

Çölgeçen, Hatice | Büyükkartal, Hatice Nurhan | Çalışkan, Ufuk Koca

Article | 2016 | Turkish Journal of Botany40 ( 5 ) , pp.496 - 505

Previous reports of plant regeneration of natural tetraploid T. pratense L.‘Elçi’could be realized only through the apical meristem calli. In order to proceed to the production stage, other regeneration methods need to be tried. Aseptic seedlings were used for the production of somatic embryos through various 2,4-D and kinetin trials. Nonuniform external callus cells with translucent cytoplasm were observed in various developmental stages of somatic embryos. Beneath these cells, there were uniformly aligned, dark-stained embryo cells with dense cytoplasm. Despite the similar developmental stages and cell characteristics of zy . . .gotic and somatic embryos, the walls of somatic embryo cells revealed a highly wavy pattern. The nucleus generally contained only one nucleolus, which was spherical, dark stained, and electron-dense. Electron-dense droplets were seen in vacuoles. The cytoplasm consisted of starch-containing amyloplasts, mitochondria, plastids, ribosomes, endoplasmic reticulum, dictyosomes, lipid, and protein bodies. In some of the somatic embryos at the globular and heart stages, vacuole or electron-translucent zones were observed in the nucleolus. Additionally, a few embryo degenerations were recorded during developmental stages of the zygotic embryo. For the first time, the somatic embryos of natural tetraploid T. pratense were produced from hypocotyl (85%), cotyledon (75%), and apical meristem (60%) explants in 0.3 mg/L 2,4-D and 2 mg/L kinetin-containing MS medium. Our study developed an effective and efficient in vitro production method for using natural tetraploid T. pratense in biotechnological studies. Previous reports of plant regeneration of natural tetraploid T. pratense L.‘Elçi’could be realized only through the apical meristem calli. In order to proceed to the production stage, other regeneration methods need to be tried. Aseptic seedlings were used for the production of somatic embryos through various 2,4-D and kinetin trials. Nonuniform external callus cells with translucent cytoplasm were observed in various developmental stages of somatic embryos. Beneath these cells, there were uniformly aligned, dark-stained embryo cells with dense cytoplasm. Despite the similar developmental stages and cell characteristics of zygotic and somatic embryos, the walls of somatic embryo cells revealed a highly wavy pattern. The nucleus generally contained only one nucleolus, which was spherical, dark stained, and electron-dense. Electron-dense droplets were seen in vacuoles. The cytoplasm consisted of starch-containing amyloplasts, mitochondria, plastids, ribosomes, endoplasmic reticulum, dictyosomes, lipid, and protein bodies. In some of the somatic embryos at the globular and heart stages, vacuole or electron-translucent zones were observed in the nucleolus. Additionally, a few embryo degenerations were recorded during developmental stages of the zygotic embryo. For the first time, the somatic embryos of natural tetraploid T. pratense were produced from hypocotyl (85%), cotyledon (75%), and apical meristem (60%) explants in 0.3 mg/L 2,4-D and 2 mg/L kinetin-containing MS medium. Our study developed an effective and efficient in vitro production method for using natural tetraploid T. pratense in biotechnological studies Daha fazlası Daha az

A new species of voles, Microtuselbeyli sp. nov., from Turkey with taxonomicoverview of social voles distributed in southeastern Anatolia

Yiğit, Nuri | Çolak, Ercüment | Sözen, Mustafa

Article | 2016 | Turkish Journal of Zoology40 ( 1 ) , pp.73 - 79

There are twelve Microtus species in Turkey and two of them are endemic to the steppic central Anatolian plateau. In this study, previously collected specimens that were recorded as Microtus irani from southeastern Turkey were reevaluated by karyologically comparing different species distributed throughout southeastern Turkey. The taxonomic status of this species was raised to a new species, Microtus elbeyli sp. nov., which has dark ochreous dorsal color, agrestis morphotype in M2, and 2n = 46, NF = 50, NFa = 46 karyotype. The new species described here raises the total number of Microtus species in Turkey to 13 and endemic vole spe . . .cies in Anatolia to three. There are twelve Microtus species in Turkey and two of them are endemic to the steppic central Anatolian plateau. In this study, previously collected specimens that were recorded as Microtus irani from southeastern Turkey were reevaluated by karyologically comparing different species distributed throughout southeastern Turkey. The taxonomic status of this species was raised to a new species, Microtus elbeyli sp. nov., which has dark ochreous dorsal color, agrestis morphotype in M2, and 2n = 46, NF = 50, NFa = 46 karyotype. The new species described here raises the total number of Microtus species in Turkey to 13 and endemic vole species in Anatolia to three Daha fazlası Daha az

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

Hamzaoğlu, Ergin | Aksoy, Ahmet | Martin, Esra | Pınar, Nur Münevver | Çölgeçen, Hatice

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

Yusufeli, Artvin’den (kuzeydoğu Anadolu) toplanan Scorzonera ketzkhovelii Grossh. (Asteraceae) Türkiye florası için yeni bir kayıttır. Tür betimlendi ve resmedildi. Ayrıca, türün karyolojik özellikleri ve polen morfolojisi verildi. 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.

Infl uence of diff erent sterilization methods on callus initiation and production of pigmented callus in Arnebia densifl ora Ledeb

Çölgeçen, Hatice | Koca, Ufuk | Toker, Gülnur

Article | 2011 | Turkish Journal of Biology35 ( 4 ) , pp.513 - 520

Bu çalışmada sodyum hipoklorit ve Bitki Koruyucu Karışımın yüzey sterilizasyonundaki etkileri araştırılmıştır. Antibiyotik-antimikotik çözeltisinin kültür ortamına eklenerek kallus indüksiyonundaki etkilerini inceledik. Eksplantlar başlangıç olarak farklı sodyum hipoklorit konsantrasyonlarıyla steril edilerek kinetin (0,29 ?M) ve naft alen asetik asit (NAA,10 ?M) içeren MS ortamında kültüre alınmıştır. Eksplantlardaki kontaminasyonlar veya yüksek sodyum hipoklorit konsantrasyonundan dolayı kallus oluşumu gözlenmemiştir. Farklı konsantrasyonlardaki Bitki Koruyucu Karışımı ve antibiyotikler kontaminasyonu azaltmış ve sürgün ucu ve gen . . .ç kök eksplantlarında kallus indüksiyonu gerçekleşmiştir. En iyi kallus oluşumu % 1-2 Bitki Koruyucu Karışım kullanımında bulunurken, sürgün uçlarındaki kallus indüksiyonu yüksek konsantrasyonda (% 4) azalmıştır. Bu çalışma, doğal ortamında arazide yetişen A. densifl ora’nın eksplant kontaminasyonlarının azaltılması ve başarılı sterilizasyon ile ilgili ilk çalışmadır. Oluşturulan kallus kültürleri renkli kalluslar üretti bunlar da spektrofotometrik yöntemle analiz edildi. We analyzed the eff ects of sodium hypochlorite and Plant Preservative Mixture (PPM) on surface sterilization. We also examined the eff ects that the addition of an antibiotic-antimycotic solution to the culture medium had on callus induction. Explants were initially sterilized with diff erent concentrations of sodium hypochlorite and cultured on MS media containing kinetin (0.29 μM) and naphthalene acetic acid (NAA, 10 μM). No calluses were produced, either because of contamination of the explants, or loss of explants as a result of the high levels of sodium hypochlorite. Th e application of PPM and antibiotics at diff erent concentrations reduced contamination and led to callus induction from shoot apexes and young root explants. Th e best callus responses were obtained using PPM at 1%-2%, whereas callus induction on shoot apexes diminished at higher concentrations (4% PPM). Th is is the fi rst report of successful sterilization and reduced contamination of explants from naturally fi eld grown A. densifl ora by PPM. Moreover, established callus cultures produced pigmented calluses, which were analyzed spectrophotometrically Daha fazlası Daha az

Effects of salt stress and synthetic hormone polystimuline K on photosynhetic activity of Trianea bogotensis Karst

Allahverdıev, Surhay Ragimoğlu | Mavituna, Meltem | Ganieva, Rena | Nafısı, Saeedeh

Article | 1998 | Turkish Journal of Botany22 ( 1 ) , pp.19 - 23

Bu çalışmada kinetin benzeri sentetik hormon olan Polystimulin K (PS-K)'nin tuz stresi uygulanmış Trianea bogotensis Karst'ın (Hydrocharitaceae) fotosentetik aktivitesi üzerine etkisi gösterildi. Değişik zaman sürelerinde (15, 30, 60, 360 ve 720 dakika) farklı tuz stresi (103, 155 ve 344 mM) uygulanmaları sonucunda , Fotosistem II (FS ll)'nin hassasiyetini incelemek için Klorofil değişken Floresans (Chlorophyll variable fluorescence) (Fv) ve yavaş floresans (Slow Fluorescence) (SF) kullanıldı. Fideler üzerindeki tuz (155 mM NaCl) uygulaması SF boyutunu yaklaşık % 50 engelledi. Fidelerin 30 dakika süreyle 20 mg/l PS-K uygulamasına ta . . .bi tutulması ve daha sonra tuz ortamına alınması sonucunda SF boyutunun yükselmesi saptanmıştır. Tuz stresi altında, bütün zaman süreçlerinde, Fv/Fo oranı azalma göstermektedir. Uygulamaların 60 dakika'sına kadar NaCl ve PS-K'nin bulunduğu ortamda Fv/Fo miktarı bir düşüş gösterip, daha sonra hafif bir yükseliş tespit edildi. Bu çalışmanın sonuçları PS-K'nin tuz stresi mekanizmasındaki koruyucu görevini anlamak açısından önemlidir. In the present study the effect of kinetin like synthetic hormone Polystimuline K (PS-K) on photosynthetic activity of salt stressed Trianea bogotensis Karst (Hydrocharitaceae) has been shown. Chlorophyll variable fluorescence (Fv) and slow fluo¬rescence (SF) have been used to investigate the sensitivity of Photosystem 11 (PS II) to different salt stress treatments (103, 155 and 344 mM), at different time courses (15, 30, 60, 360 and 720 minutes). Salt stress (155 mM NaCl) treatments of the seed¬lings inhibited the SF magnitude approximately to 50 %. Pretreatment of seedlings for 30 minutes in 20 mg/l PS-K followed by salt stress resulted in an increase in SF magnitude. Under salt stress the magnitude of Fv/Fo decreases within all time measurments. In the presence of NaCl and PS-K until 60 min. of treatment there was a decrease in Fv/Fo value, then a slight increase was ob¬served. The results of this study are important in understanding the protective function of PS-K on salt stress mechanism Daha fazlası Daha az

The bryophyte flora of Sinop Peninsula (Turkey)

Söylemez, Burçin | Ören, Muhammet | Ursavaş, Serhat | Keçeli, Tamer

Article | 2017 | Biological Diversity and Conservation10 ( 3 ) , pp.120 - 129

This study presents knowledge about bryophytes of Sinop peninsula which one of the Key Biodiversity Areas (KBA). Research materials were collected from 60 different sites between September 2014-June 2016. As a result of the evaluation of 614 samples 25 species of 17 genera belonging to 17 families from Marchantiophyta (Liverworts), 130 species of 74 genera belonging to 28 families from Bryophyta (mosses), 2 species of 2 genera belonging to 2 families from Anthocerotophyta (Hornworts). In total, 157 specific and infraspecific taxa belonging to 47 families and 93 genera were identified. Among these, 95 taxa are new to Sinop province a . . .nd 26 taxa are new to A3 square according to Henderson (1961) grid system. Bu çalışma Önemli Doğa Alanları (ÖDA)’ndan biri olan Sinop Yarımadası’nın briyofitleri hakkında bilgi sunmaktadır. Araştırma materyali Eylül 2014-Haziran 2016 tarihleri arasında 60 farklı notadan toplanmıştır. 614 örneğin değerlendirilmesi sonucunda Machantiophyta’dan (Ciğerotları) 17 familya ve 17 cinse ait 25, Bryophyta’dan (Karayosunları) 28 familya ve 74 cinse ait 130, Anthocerotophyta’dan (Boynuzotları) 2 familya ve 2 cinse ait 2 tür tespit edilmiştir. Toplamda 47 familya ve 93 cinse ait, tür ve tür altı düzeyde 157 takson tespit edilmiştir. Bunlar arasından 95 tanesi Sinop ili için, 26 tanesi ise Henderson (1961) kareleme sistemine göre A3 karesi için yenidir Daha fazlası Daha az

Effect of salt stress and synthetic hormone polystimuline K on the photosynthetic activity of cotton (Gossypium hirsutum)

Ganıeva, Rena A. | Allahverdıyev, Surhay R. | Guseınova, Nilufar B. | Kavaklı, Halil I. | Nafisi, Saeedeh

Article | 1998 | Turkish Journal of Botany22 ( 4 ) , pp.217 - 221

Bir sitokinin anaoğlu olan Polistimülin’nin K (PS-K) farklı periotlarda tuz stresine (155 mM NaCl) maruz kalmış farklı pamuk (Gossypium hirsutum L.) genotiplerindeki gecikmiş ışık komponent durumu (DF), aralıklı flöresans (IF) ve klorofil (Chl a/b) oranı üzerindeki etkisi araştırıldı. Tuz stresinin erken aşamalarında, DF ve IF dalga boylarında düşmeye neden oldugu ve bunun fotosistem II (PS II) aktivitesinin azalması yoluyla ortaya çıktığı gösterilmiştir. Bu düşüş, alıcı PS II merkezindeki klorofil b moleküllerinin azalması ve bunun sonucu olarak Chl a/b oranının yükselmesiyle oluşmaktadır. Buna karsın, etkiye maruz kalan degiskenle . . .rin PS-K ön-muamelesi sonucu düzelmesi, bu sentetik büyüme düzenleyicisinin tiylakoid membranları üzerinde kararlılık kazandırıcı etkisi oldugunu ortaya koymuştur. Bu kararlılık, öncelikle H+/NaCl degisiminin normalize edilmesi ve böylece zarara ugramıs PS II merkezinin onarımının hızlandırılmasına neden olmaktadır. The effects of Polystimuline K (PS-K), as a cytokinin analogue, on delayed light component state (DF), intermittent fluorescence (IF) and chlorophyll (Chl) a/b ratio was investigated in the leaves of different genotypes of cotton (Gossypium hirsutum L.) under salt stress (155 mM Na Cl) for different periods of time. It was shown that in the early perioıd of salt stress, DF and IF amplitudes are decreased, which is indicative of a Photosystem II (PS II) activity decrease. It is possibly related to the damage of chlorophyll in the PS II donor site and the decrease of Chl b molecules leading to an increased Chl a/b ratio. However, the improvement of the affected variables as a consequence of PS-K pretreatment suggests the stablizing effects of the synthetic growth regulator on the thylakoid membranes leading to a normalization of H+/NaCl exchange that consequently hastens the recovery of damaged PS II centers Daha fazlası Daha az

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