CGN black salsify collection
Black salsify is a so-called 'forgotten vegetable'. Before World War II, black salsify was a common vegetable in the Netherlands, but it became unpopular afterwards, due to the way of preparation. It is a dirty job to prepare the vegetable, because of the sticky juice which appears with peeling. For historical-cultural reasons, CGN started to establish a collection of (black) salsify.
The genus Scorzonera comprises around 175 species. Black salsify is the only cultivated species in this genus.
Black salsify is native to Southern Europe and the Near East. The vegetable has been cultivated since the 17th century in Western Europe. At present, Belgium is the country with the largest acreage of black salsify. A limited number of varieties exist in the Netherlands, but breeding of commercial cultivars never took place. As a consequence, the CGN black salsify collection is small, just over 30 accessions. Black salsify (Scorzonera hispanica) is believed to be the successor of another forgotten vegetable, called salsify or in Dutch "haverwortel" or “paarse morgenster” (Tragopogon porrifolius ssp. porrifolius).
Maintenance
Germination thresholds for uptake of black salsify in the collection are 80% for cultivated material and 60% for accessions of wild species. Salsify is a biannual cross-fertilising crop. This means that only second year plants will produce flowers. The seed production takes place under outdoor conditions in isolation plots.
To regenerate black salsify, seeds are sown in April in sowing trays in the greenhouse. After five weeks, the plants are transplanted in the field. The first year, most of them will not flower, so there is no need to isolate them. In November, the roots are harvested and stored at 4°C. In March of the second year, the roots are planted again in isolated plots, at least 50 meters apart. Triticale is normally used as an isolation crop. From a minimum number of 30 plants, seeds are produced. In June, the first seeds can be harvested, but seed production can take place until October. Composition
Since 2010, CGN has built a black salsify collection. This started with the acquisition of accessions available in European genebanks and working collections of several companies.
This resulted in the acquisition of 15 Dutch varieties, seven varieties from Belgium and some other varieties from various Eastern European countries. In 2014 and 2015, a few accessions of Scorzonera, Tragopogon porrifolius ssp. porrifolius were also collected in the Netherlands. After successful regeneration, the material will also be publicly available. Altogether, the collection currently consists of 34 accessions.
Characterisation and evaluation
Part of the accessions have been characterised for a maximum of 12 phenotypic traits. For most of the accessions, pictures of flowers and roots are available through online search. Evaluation trials have not been organised yet.