Intergeneric hybridisation between Berula erecta and Helosciadium nodiflorum (Apiaceae)

Intergeneric hybridisation in the Apiaceae

Intergeneric hybridisation in the Apiaceae Desjardins et al. 2015

TS. Desjardins SD, Leslie AC, Stace CA, Schwarzacher T,  Bailey JP. 2015. Intergeneric hybridisation between Berula erecta and Helosciadium nodiflorum (Apiaceae). Taxon 64:
784-794. DOI: 10.12705/644.9 Publisher link££ Author version Intergeneric hybridisation

A hybrid between Berula erecta and Helosciadium nodiflorum is reported from Chippenham Fen National Nature Reserve (NNR), Cambridgeshire, England. Parentage was investigated using chromosome counts, a maternally-inherited chloroplast marker (rps16-trnK), a biparentally-inherited nuclear marker (the ITS), and fluorescent in situ hybridisation (FISH) using labelled total genomic probes. Two parental genomes were identified in the putative hybrid (2n = 20), a maternal genome consisting of 9 chromosomes from B. erecta (2n = 18) and a paternal genome consisting of 11 chromosomes from H. nodiflorum (2n = 22). The implication of this hybrid for the taxonomy of the group is discussed, and a new hybrid genus is described: x Beruladium A.C. Leslie (= Berula Besser ex W.D.J. Koch x Helosciadium W.D.J. Koch). In overall appearance the hybrid resembles a small, creeping H. nodiflorum, and can be identified in the wild by a combination of characters: 1) the absence of a ring-mark on the petiole below the lowest pair of leaflets that is characteristic of pure Berula, 2) lower leaves with up to 5 pairs of leaflets, 3) peduncles varying from shorter than to longer than rays, 4) umbels with several usually untoothed bracts, 5) a relatively long stigma and style, and 6) the absence of ripe fruits. The detection of this taxon is of considerable interest and, as far as we know, it is the first confirmed intergeneric hybrid in the Apiaceae within Europe.



About Pat Heslop-Harrison

Professor of Molecular Cytogenetics and Cell Biology, University of Leicester Chief Editor, Annals of Botany. Research: genome evolution, breeding and biodiversity in agricultural species; the impact of agriculture; evalutation of research and advanced training.
This entry was posted in cytogenetics, Publications, Species and tagged , , , , , , , , , , . Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s