Journal
NORDIC JOURNAL OF BOTANY
Volume 36, Issue 9, Pages -Publisher
WILEY
DOI: 10.1111/njb.01778
Keywords
Primula; hybridisation; species boundaries
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Three Primula species, Primula vulgaris, P. veris and P. elatior, have been objects of fascination for gardeners and botanists over several centuries. The species are able to hybridise, and where they co-occur, hybrids are commonly found. In Denmark, MOns Klint on the island of MOn and KObelev Skov on Lolland are examples of localities where all three species occur and where the hybrids P. xdigenea, the hybrid between P. vulgaris and P. elatior, and P. xpolyantha, the hybrid between P. veris and P. vulgaris, can also be found. To investigate relationships between the species and their hybrids, we sampled 168 specimens from 10 geographical locations and subjected them to genetic analysis. The samples were also identified based on morphological traits: primarily inflorescense structure, the size, shape, colour and markings of corolla and leaf basis, leaf blade texture and hairiness. After identifying species-specific SNPs in the Internal Transcribed Spacer sequence, these were used to resolve species and hybrid boundaries and status through a cleaved amplified polymorphic sequence assay. Polymorphisms in the chloroplast trnL sequence were used as a high-throughput marker and used to determine the maternal parent of hybrids. Ten simple sequence repeat markers were applied to obtain further insight into the genetic makeup of the accessions using structure and Introgress, providing information of genetic variability within and between populations. Our results indicated that backcrossing of P. xdigenea hybrids with parental species has occurred, and that many of the P. xdigenea sampled were later-generation hybrids rather than F(1)s. Analyses of P. xpolyantha specimens show mostly the expected pattern for primary hybrids but indications of P. veris ancestry of a P. vulgaris plant was discovered. Our results further indicate that some of the specimens initially identified as P. elatior include P. vulgaris among their progenitors and thus challenge currently accepted species boundaries.
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