This page is a draft, part of our ongoing wild potato project. I’ll probably be adding information to the species pages through 2020 at least, but I’m making them public since they may be useful even incomplete.

Solanum demissum

Synonyms: S. alpicum, S. semidemissum, S. utile

Series: Acaulia

EBN: 4

Ploidy: Hexaploid

Segregation:

Self-compatible:

Cytoplasm Type: D (Hosaka 2014)

Description

Solanum demissum (demissum meaning “low lying”) is a widespread species in Mexico, particularly densely in central Mexico, and reaching south into Guatemala.  Plants reach about 18 inches tall, although many take on a much more compact or rosette form.  Flowers violet to purple.

This species is more closely related to S. acaule and S. albicans than to other Mexican species, which is quite interesting given the very long distance between the natural ranges of those species.

This species can survive frosts down to 25 degrees F (-4 C) (Li 1977).  Vega (1995) found that this species is much more frost tolerant than domesticated potato.

Condition Level of Resistance Source
Late Blight Resistant  Machida-Hirano 2015
Wart Somewhat resistant  Machida-Hirano 2015
Soft Rot / Blackleg Somewhat resistant  Machida-Hirano 2015
Potato Virus X Somewhat resistant  Machida-Hirano 2015
Potato Virus Y Resistant  Machida-Hirano 2015
Potato Leaf Roll Virus Somewhat resistant  Machida-Hirano 2015
Colorado Potato Beetle Somewhat resistant  Machida-Hirano 2015
Root Knot Nematode Somewhat resistant  Machida-Hirano 2015
Frost Somewhat resistant  Machida-Hirano 2015
Drought Somewhat resistant Machida-Hirano 2015

Glykoalkaloid content

Cultivation

I have found S. demissum difficult to germinate, with often low germination percentage and a prolonged germination period.

Breeding

Crosses with S. tuberosum

Female Male Berry Set Seed Set Germination Ploidy Source
S. tuberosum S. demissum Low Moderate     Jackson (1999)
S. demissum S. tuberosum Moderate High     Jackson (1999)
             

Crosses with other species

Watanabe (1991) found that 2.3% of varieties of this species produced 2n pollen and Jackson (1999) found 3-9%, which would be effectively dodecaploid and 8EBN.

Female Male Berry Set Seed Set Germination Ploidy Source
             

 

 

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