Solanum x edinense
|Tuberization Photoperiod||Long Day|
|Citation||Berthault: Rech. bot. Solanum tub. 142, fig. 41, 42, tab. 8. 1911.|
Solanum x edinense is a natural hybrid species from central Mexico, generally found in areas of potato cultivation. It is thought to be a cross of domesticated S. tuberosum x S. demissum. Plants range from three to six feet tall, more similar in form to domesticated potatoes than S. demissum. Flowers are typically blue, less commonly white. Berries are round, similar to the domesticated potato, but often seedless. Some clones appear to be male sterile, while others set small amounts of seed when self-pollinated. The specific epithet refers to Edinburgh, Scotland and specifically the botanic garden there, where the species was first described. Its importance as a source of disease resistance was first recognized there when late blight damaged the domesticated potato varieties but left S. x edinense undamaged.
The resistances of S. x edinense have received little study, but the wild parent, S. demissum, has a wide range of pest and disease resistances and presumably those will be inherited in some of the progeny. S. demissum was used commonly in domesticated potato breeding in the early to mid-20th century as a source of resistance traits.
|Condition||Type||Level of Resistance||Source|
|Phytophthora infestans (Late Blight)||Fungus||Resistant|
No information, but intentional crosses between the putative parent species have generally segregated for glycoalkaloid content, with some palatable progeny.
Growing considerations for this species are the same as for domesticated potato, although stolons may be longer.
This was one of the first wild potato species used in breeding with the domesticated potato. The variety Brennragis, a S. x edinense x S. tuberosum hybrid, was released in 1936 (Ross 1966).
In the process of recapitulating this hybrid at the Royal Botanic Garden Edginburgh, they found success using S. demissum only as the female parent (Coleman 2018). They also noted possible cases of hybrid necrosis in the progeny (Coleman 2019).
Crosses with S. tuberosum
|S. x edinense||S. tuberosum 4x||Yes||Yes||Yes||4x+|
Crosses with other species
|S. commersonii 3x||S. x edinense