Thlaspiceras sensu Meyer Tür Kompleksinin Plastidik trnQ-5'rps16 Bölgesine Dayalı Filogenisi

Brassicaceae familyası içerisinde sistematik anlamda en problemli cinslerden birisi Noccaea Moench cinsidir ve bu cinsin sınırları ile ilgili tartışmalar hala devam etmektedir. Bu çalışmada bazı yazarlar tarafından hala ayrı bir cins olarak değerlendirilen Thlaspiceras tür kompleksine ait 7 tür ve 21 populasyona ait bireyler ilk defa filogenetik anlamda plastidik trnQ-5'rps16 bölgesi kullanılarak değerlendirilmişlerdir. Kullanılan bu genetik belirteç hem filogenetik analizlerde hem de haplotip analizlerinde türleri/popülasyonları sistematik ilişkilerinden ziyade coğrafi yakınlıklarına göre gruplandırmıştır. Bu durumun temel sebebi N. eigii ve N. bovis örneklerinde olduğu gibi, coğrafi olarak aynı bölgelerde yetişen ancak morfolojik olarak ciddi ölçüde farklılaşmış türlerin aynı haplotipleri paylaşmasıdır. Dolayısıyla da çalışılan örneklerde bu genetik belirteç açısından hem haplotip hem de nükteotid çeşitliliği görece düşüktür.

Phylogeny of Thlaspiceras sensu Meyer Species Complex based on Plastidic trnQ-5’rps16 Region

Noccaea Moench is one of the most problematic genera among family Brassicaceae and discussions about its generic circumscription is still ongoing. In this study, 7 species and 21 populations belonging to Thlaspiceras species complex, which considered as a separate genus by some authors, were evaluated first time by using plastidic trnQ-5'rps16 region. This genetic marker grouped species/populations concordantly their geographical range rather than systematic relationships in both phylogenetic and haplotype analyses. The main reason for this, morphologically differentiated sympatric species share same haplotypes as in examples N. bovis and N. eigii. Thus, both haplotype and nucleotide diversity are relatively low in terms of genetic marker studied.

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