Bu çalışma, Türkiye’deki çay ( Camellia sinensis (L.) Kuntze) plantasyonlarının vasküler yabani bitki taksalarını ve hem mahsul kalitesini hem de verimini olumsuz etkileyen bu taksonların kritik kontrol dönemlerini belirlemek için yapılmıştır. Bu taksonlar, çay plantasyonlarında ve lokal herbaryumda (KATO) yazarların çalışmaları ve gözlemleri ile belirlenmiştir. Çalışma kapsamında çay bahçelerinde yayılış gösteren toplam 114 adet doğal ve doğallaşmış damarlı bitki taksonu tespit edilmiştir. Hasat edilen sürgünlere kasıtsız olarak karıştırılan ve çay kalitesini olumsuz etkileyen en zararlı bitki taksonları vurgulanmıştır. Çay bahçelerinde en çok yayılan taksonlar; Pteridium aqulinum (L.) Kuhn., Smilax excelsa L., Alnus glutinosa (L.) Gaertn. subsp. barbata (C.A. Mey.) Yalt., Crassocephalum crepidioides (Bentham) S. Moore, Calystegia silvatica (Kit.) Griseb, Commelina communis L. , Microstegium vimineum (Trin.) A. Camus. , Oplismenus undulatifolius (Ard.) P. Beauw. ve Rubus spp.’dir. Bu taksonların çoğu ekolojik toleransı yüksek ve ülkemizde doğallaşmış taksonlardır. Taksonlardan dokuz adeti tırmanıcı, 14 adeti de odunsu bitkidir. Çay bahçelerindeki yabancı bitkilerin kontrollerindeki kritik periyotlar hem literatürden hem de arazideki fenolojik/ekolojik gözlemlerimizden elde edilmiştir.
Dogal mirasimizin bir parcasi olan anit agaclar yore tarihine isik tuttugu ve gecmis ile gelecek arasinda bir kopru olusturdugu icin buyuk bir oneme sahiptirler. Gunumuze degin yapilmis olan calismalarla 23 adet anit dogu ladini bireyi tespit edilmistir. Dogu ladini, Dogu Karadeniz Bolgesi’nde genellikle 900 (1000)–2000 (2200) m. yukseltiler arasinda denize donuk nemli yamaclarda yayilis gostermektedir. Bu arastirma ile Salpazari (Trabzon) yoresinde boyutsal anit agac olarak degerlendirilebilecek bir dogu ladini (Picea orientalis (L.) Link.) bireyinin tanitilmasi amaclanmistir. Yapilan olcumler sonucu anit dogu ladininin yaklasik olarak 470 yasinda, 60 m boyda ve 178 cm kabuklu gogus (d1.30) capinda oldugu belirlenmistir.
Aim of study: In this study, it was aimed to contribute the vascular plant species diversity of Turkey. Area of study: A8 Artvin: Hatila Valley National Park, rocky places, roadsides, 559 m in NE Anatolia. Material and method: Plant materials were collected during the field studies in the years 2011 and 2012. They were processed according to standard herbarium techniques and stored at three herbariums. Main results: Cerastium szowitsii Boiss. is reported as a new species to the Turkish flora. Research highlights: Recent studies on vascular flora underlined that native and non-native taxa have been newly recorded from Turkey. Thus, this kind of studies should be conducted in mountainous part of NE Anatolia.
Isolating barriers between sympatric interfertile species are maintained by processes that occur within their hybrid zones. Although the effects of intrinsic selection on hybrid fitness are well known, less is understood about extrinsic fitness variation. At Tiryal Da¤›, NE Turkey, Rhododendron x sochadzeae Charadze & Davlianidze (R. ponticum L. x caucasicum Pall.) forms large populations in which neither segregation nor backcrossing occur, in habitats intermediate between those of its parents. Using singlecopy species-specific RAPD and ISSR markers, it was determined that all R. x sochadzeae plants are F1s, and that there are many separate genets present. Through hand pollination experiments, it was determined that R. x sochadzeae plants can produce viable F2 seeds or backcrosses in either direction. Therefore, all non-F1 hybrid derivatives appear to be eliminated at Tiryal Da¤› due to post-germination selection. However, adult backcrosses can and do recruit in large numbers in different habitat conditions at another site. From this, the selection that favours F1s over BCs at Tiryal Da¤› must be habitat-mediated. We have concluded that strong habitat-mediated selection is most likely maintaining species barriers at Tiryal Da¤› by eliminating hybrid generations subsequent to F1. Similar forces might occur in other hybrid zones, but may be countered by additional effects that increase fitness in post-F1s, or restrict the formation and/or fitness of F1s. We suggest that the superior fitness of F1s might be due to gene complexes that confer tolerance to specific habitat conditions in each parent that break up after the F1 generation. A simple mathematical model is provided, that describes how an F1 might thereby outcompete subsequent generations at all points along a habitat gradient.
Tragopogon L. (Asteraceae) includes several cryptic species that are geographically widespread and morphologically similar. Here, we describe two new native species from eastern Anatolia. Through both morphological and molecular data, we present diagnostic characteristics, descriptions, pollen grains and micro‐ and macro‐morphological properties of achenes, as well as the conservation status of the newly described species. Current morphological and molecular results support treating T. reticulatus Boiss. & Huet and the two newly described taxa under the section Profundisulcati Kuthath. Molecular phylogentic reconstructions based on ITS data show that T. longirostris Sch. Bip. is a distinct species rather than a subspecies of T. porrifolius L. ( T. porrifolius subsp. longirostris (Sch. Bip.) Greuter) and that ligule colour is not a taxonomically important trait at the subrageneric level.
The endemic Anatolian willow, Salix anatolica (Salicaceae), was described based on solely female individuals in 2008. It was re-collected and the description was emended based on both male and female flower properties in the present study. Additionally, the pollen morphology, wood anatomical features and conservation status of S. anatolica are presented for the first time.
An Asian species, Sigesbeckia pubescens (Makino) Makino (Compositae), is recorded as an alien for the flora of Turkey. The specimens were collected from A8 Artvin and a distribution map for the species is provided.
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