Abstract

The aim of this research is the palynological characterisation of all Vinca species naturally grown in Turkey. In this context, six Vinca (Apocynaceae) taxa from Turkey were investigated – V. herbacea Waldst & Kit., V. ispartensis Koyuncu & Ekşi, V. minor L., V. major subsp. major L., V. major subsp. hirsuta (Boiss.) Steam, and V. soneri Koyuncu – by a palynological approach, and palynological characters of the more closely related taxa (especially two new species and subspecies) were defined. Thus, pollen structures of the six taxa and their systematical relations could be discussed. The pollen type of the studied taxa was determined to be colpate and the sculpture psilate. The results confirm that palynological characters show minor differences between the investigated taxa of the genus. Nevertheless, these features can be used to discriminate among the taxa. PAST-multivar-cluster and principal component analysis were applied to the obtained data to compare the palynological characters of the six taxa and prove the similarities among their pollen. The results shed light on the relationship between two new Vinca species (V. soneri Koyuncu, V. ispartensis Koyuncu & Ekşi) and their closest taxa (V. herbacea). The statistical results determined the simmilarities of morphologically closer taxa (V. herbacea, V. ispartensis, V. soneri) and indicate that V. herbacea and V. ispartensis are much closer to each other compare to V. soneri, with regard to the palynological features. Also, the two subspecies (V. major subsp. major and V. major subsp. hirsuta) were observed to be most closely related to each other. In conclusion, with a few exceptional states, the palynological findings support the morphological classification. As the results demonstrate, palynological parameters can be helpful for taxonomical classification of plant taxa.

摘要

这项研究的目的是对在土耳其自然生长的所有长春花品种进行孢粉学表征。在此背景下，研究了来自土耳其的六种长春花（夹竹桃科）分类群——V.herbacea Waldst & Kit.、V. ispartensis Koyuncu & Ekşi、V. minor L.、V. major subsp 。主要L., V. 主要亚种。hirsuta (Boiss.) Steam 和V. soneriKoyuncu - 通过孢粉学方法，定义了更密切相关的分类群（特别是两个新物种和亚种）的孢粉特征。因此，可以讨论六个分类群的花粉结构及其系统关系。所研究类群的花粉类型被确定为 colpate 和雕塑 psilate。结果证实，孢粉学特征在该属的调查分类群之间显示出微小的差异。然而，这些特征可用于区分分类群。对获得的数据应用PAST-multivar-cluster和主成分分析，比较了6个类群的孢粉学特征，证明了它们花粉之间的相似性。结果揭示了两种新的长春花物种之间的关系（V. soneri Koyuncu, V. ispartensis Koyuncu & Ekşi) 和它们最接近的分类群 ( V. herbacea )。统计结果确定了形态上更接近的类群( V. herbacea , V. ispartensis , V. soneri ) 的相似性，并表明V. herbacea和V. ispartensis在孢粉学方面比V. soneri更接近。特征。此外，两个亚种（V. major subsp . major和V. major subsp . hirsuta) 被观察到彼此之间的关系最为密切。总之，在一些特殊状态下，孢粉学研究结果支持形态分类。结果表明，孢粉学参数有助于植物分类群的分类。