Türkiye'deki Tanacetum oxystegium (Sosn.) Grierson ve Tanacetum pinnatum Boiss. (Asteraceae) cinslerinin karşılaştırmalı morfolojisi, palinolojisi ve aken mikromorfolojisi

Abstract

Tanacetum L. (Asteraceae) cinsi, Türkiye'de 27 endemik tür de dahil olmak üzere 61 takson ile yüksek bir çeşitlilik göstermektedir. Bu çalışma, Tanacetum oxystegium ve T. pinnatum türlerinin morfolojisi, meyve ve polen özelliklerinin kapsamlı bir karşılaştırmalı analizini yaparak bu özellikleri açıklığa kavuşturmayı ve incelenen türlerin taksonomik sınırlarına katkıda bulunmayı amaçlamaktadır. Bitki materyalleri 2024 yılında Erzurum bölgesindeki doğal habitatlardan toplanmıştır. Makro ve mikromorfolojik incelemeler ışık mikroskobu (LM) ve taramalı elektron mikroskobu (SEM) kullanılarak yapılmıştır. Sonuçlar, her iki türün de 5-8 uzunlamasına damarlı ve testere dişli koronalı ters konik meyveleri olmasına rağmen, yüzey süslemelerinde önemli ölçüde farklılık gösterdiklerini ortaya koymuştur. T. oxystegium, çizgili ornemantasyon ve slime hücrelerin varlığı ile karakterize edilirken, T. pinnatum ağsı-çizgili bir yüzey sergilemektedir. Palinolojik analizler, iki türün de radyal simetrik, izopolar ve trizonokolporat polenlere sahip olduğunu ve dikenli-delikli ornamentasyon içerdiğini ortaya koymuştur. Bununla birlikte, T. oxystegium, T. pinnatum'a kıyasla daha büyük bir Amb, daha kalın bir ekzin ve daha uzun dikenlerle ayırt edilir. Bu bulgular, aken ve polen morfolojisinin, morfolojik olarak benzer bu taksonları ayırt etmek için güçlü sistematik belirteçler olarak hizmet ettiğini ve sınıflandırmalarıyla ilgili literatürdeki önemli bir boşluğu doldurduğunu göstermektedir.

Keywords

• Aken
• Asteraceae
• Mikromorfoloji
• Morfoloji
• Polen
• Tanacetum

Supporting Institution

TÜBİTAK

Project Number

123Z282

Thanks

Bu çalışma, Gazi Üniversitesi Biyoloji Bölümü'nde yürütülen “Tanacetum oxystegium (Sosn.) Grierson ve Tanacetum pinnatum Boiss. üzerine morfolojik, mikromorfolojik, anatomik ve palinolojik çalışmalar” başlıklı yüksek lisans tezinin bir parçasıdır. Çalışma, TÜBİTAK tarafından 123Z282 numaralı proje kapsamında desteklenmiştir.

Comparative Morphology, Palynology and Achene Micromorphology of Tanacetum oxystegium (Sosn.) Grierson and Tanacetum pinnatum Boiss. (Asteraceae) in Türkiye

Abstract

The genus Tanacetum L. (Asteraceae) exhibits high diversity in Türkiye with 62 taxa, including 27 endemic taxa. This study aims to provide a comprehensive comparative analysis of the morphology, achene and pollen characteristics of Tanacetum oxystegium and T. pinnatum to clarify these features and contribute to the taxonomic boundaries of the species investigated. Plant materials were collected from natural habitats in the Erzurum region in 2024. Macro- and micromorphological investigations were conducted using light microscopy (LM) and scanning electron microscopy (SEM). Results indicated that while both species possess obconical achenes with 5–8 longitudinal ribs and a serrate-dentate corona, they differ significantly in surface ornamentation. T. oxystegium is characterized by striate ornamentation and the presence of slime cells, whereas T. pinnatum exhibits a reticulate-striate surface. Palynological analysis revealed that the two species have radially symmetrical, isopolar and trizonocolporate pollen with echinate-perforate ornamentation. However, T. oxystegium is distinguished by a larger Amb, thicker exine and longer spines compared to T. pinnatum. These findings demonstrate that achene and pollen morphology serve as robust systematic markers for differentiating these morphologically similar taxa and fill a significant gap in the literature regarding their classification.

Keywords

• Achene
• Asteraceae
• Micromorphology
• Morphology
• Pollen
• Tanacetum

Supporting Institution

TUBITAK

Project Number

123Z282

Thanks

This study is a part of the master’s thesis titled “Morphological, micromorphological, anatomical and palynological studies on the Tanacetum oxystegium (Sosn.) Grierson and Tanacetum pinnatum Boiss.” being conducted at Gazi University, Department of Biology. It was supported by TUBITAK under Project No: 123Z282.

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