Micromorphological and Palynological Studies on Centaurea pseudoscabiosa Boiss. & Buhse (Yaman kavgalaz) Subtaxa

Öz

In this study, the achene and pollen characteristics of the subtaxa Centaurea pseudoscabiosa, within the Acrocentron section of the genus Centaurea were determined using light microscopy and scanning electron microscopy. The main objective of this study was to determine the importance of achene and pollen characteristics in solving systematic problems for taxa within the C. pseudoscabiosa. Centaurea pseudoscabiosa is represented by four subspecies in Türkiye: C. pseudoscabiosa subsp. pseudoscabiosa, C. pseudoscabiosa subsp. araratica, C. pseudoscabiosa subsp. sipikorensis, and C. pseudoscabiosa subsp. glehnii. The overlapping values of morphological characters used in the discrimination of subspecies lead to difficulties in distinguishing subtaxa. Pollen and mature achene samples obtained from the field and existing herbarium specimens were examined using light and scanning electron microscopy to obtain data on numerous characters related to these two structures. The resulting data matrix was analyzed using numerical analysis to generate a dendrogram. According to the dendrogram, it was determined that the best distinctive pollen characters for subtaxa are the mean polar axis (PEort), pore length (Plt) and width (Plg), aperture type (APER), colpus length (Clg), and amb shape (Amb), while for achene characteristics, epidermal cell length (H) and width (I) were identified. The resulting dendrogram was evaluated to reveal the relatedness of taxa within the C. pseudoscabiosa.

Anahtar Kelimeler

• Acrocentron
• Achene
• Cardueae
• Compositae
• Micromorphology
• Pollen

Yamankavgalaz (Centaurea pseudoscabiosa Boiss. & Buhse) Alttaksonları Üzerine Mikromorfolojik ve Palinolojik Araştırmalar

Öz

Bu çalışmada, Centaurea (Peygamberçiçeği) cinsi Acrocentron altseksiyonu içerisinde yer alan Centaurea pseudoscabiosa (yaman kavgalaz) alt taksonlarının aken ve polen özellikleri ışık (IM) ve taramalı elektron mikroskobu (SEM) kullanılarak belirlenmiştir. Bu çalışmanın temel amacı C. pseudoscabiosa kompleksi içerisinde yer alan taksonların sistematik problemlerinin çözülmesinde aken ve polen makro ve mikromorfolojik özelliklerinin önemini belirlemektir. C. pseudoscabiosa Türkiye’de C. pseudoscabiosa subsp. pseudoscabiosa, C. pseudoscabiosa subsp. araratica, C. pseudoscabiosa subsp. sipikorensis ve C. pseudoscabiosa subsp. glehnii olmak üzere dört alt türle temsil edilmektedir. Alttürlerin ayrımında kullanılan morfolojik karakterler değerlerinin üst üste binmesinden dolayı taksonların ayırımında zorluklar yaşanmaktadır. Arazi ve mevcut herbaryum örneklerinden elde edilen polen ve olgun aken materyalleri ışık ve taramalı elektron mikroskobu ile incelenerek bu iki yapıyla ilgili çok sayıda karaktere ait veriler elde edilmiştir. Oluşan veri matrisi, dendrogram elde etmek için sayısal analiz yöntemiyle analiz edilmiştir. Oluşturulan dendrograma göre, alttaksonları en iyi ayırt edici polen karakterlerinin polar eksen ortalaması (PEort), por uzunluğu (Plt) ve genişliği (Plg), apertür tipi (APER), kolpus uzunluğu (Clg), amb şeklinin (Amb) yanı sıra aken karakterleri için epidermis hücre uzunluğu (H) ve genişliğinin (I) olduğu tespit edilmiştir. Elde edilen dendrogram değerlendirilerek C. pseudoscabiosa içerisinde yer alan taksonlar arasındaki akrabalık ilişkisi ortaya çıkarılmıştır.

Anahtar Kelimeler

• Compositae
• Cardueae
• Acrocentron
• Mikromorfoloji
• Polen
• Aken

Kaynakça

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