Homoploid hybrids of Origanum (Lamiaceae) in Turkey: morphological and molecular evidence for a new hybrid. (4th May 2021)

• Record Type: Journal Article
• Authors: Arabaci, Turan; Çelenk, Sevcan; Özcan, Taner; Martin, Esra; Yazici, Türker; Açar, Mikail; Üzel, Devrim; Dirmenci, Tuncay
• Is Part Of: Plant biosystems. Volume 155:Number 3(2021)
• Page Start: 470
• Page End: 482
• Publication Date: 2021-05-04
• Subjects: Hybridization -- homoploidy -- Origanum -- Origanum × aytacii -- pollen -- ITS -- Turkey; Botany -- Periodicals; Biological systems -- Periodicals; Plants -- Periodicals; 581
• DOI: 10.1080/11263504.2020.1762777
• Languages: English
• ISSNs: 1126-3504

Abstract

Abstract: In this study, three hybrids of Origanum (Lamiaceae) were examined in detail using morphological, karyological, palynological and molecular approaches. One of the three hybrids, O. × aytacii, is here described for the first time, and is compared with its putative parents, O. sipyleum and O. vulgare subsp. hirtum . In addition to morphological, karyological and palynological features, we also examined nuclear ribosomal DNA (ITS) sequences of O. × intermedium ( O. onites × O. sipyleum ), O. × intercedens ( O. onites × O. vulgare subsp. hirtum ) and their purported parental species that share the same area with the new hybrid. Pollen grains were hexacolpate and isopolar. The range of Polar/Equatorial ratio (P/E) of pollen for investigated taxa varied from 0.74 to 0.99. All investigated taxa are diploid with a chromosome number as 2n = 30. According to molecular results, O. × aytacii was the most polymorphic taxon. In addition, DNA sequences showed that O. × intercedens was more similar to O. vulgare subsp. hirtum than to O. onites, and O. × intermedium was more similar to O. onites than to O. sipyleum . Furthermore, O. onites and O. vulgare subsp. hirtum have many different ITS haplotypes, probably resulting from backcrossing with different individuals. Results obtained in this study demonstrate that hybridization has played a major role in the process of Origanum speciation.