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Solanum acroglossum

Common Name(s) Papa de Amaa, Auqui Papa
Code acg
Clade 3
Series Piurana
Ploidy Diploid (2x)
Self-compatible No
Cytoplasm Type W (Hosaka 2009)


Solanum acroglossum distribution Map note

Solanum acroglossum (acroglossum means something like top-tongued or long-tongued) is a Peruvian diploid species.  Plants are generally a bit smaller than domesticated diploids, with sparser foliage.  Tubers are very unusual, with alternating swellings and restrictions, like beads on a string (the technical term is moniliform).  Flowers light blue.  It is found at elevations from 2500 all the way up to 3700 meters (Ochoa 2004).

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

This species appears to produce unique compounds that confer resistance to the Colorado potato beetle.  S. acroglossum lacks the trichomes that are often associated with CPB resistance and also lacks high concentrations of glycoalkaloids, but contains hydroxycoumarines, a class of compounds that includes at least one isomer for which anti-larval activity has been noted (Tai 2014).

Condition Level of Resistance Source
Colorado Potato Beetle Resistant Pelletier 2007
Late Blight Somewhat Resistant Ochoa 2004

Glykoalkaloid content

A spectrographic analysis of this species showed very low levels of solanine, chaconine, and a selection of lesser glycoalkaloids, including tomatines and demissines (Tai 2014).




I have found Solanum acroglossum easy to germinate using the standard conditions for S. tuberosum.


Crosses with S. tuberosum

Watanabe (1991) found that 3.6% (which was only 1 plant) of varieties of this species produced 2n pollen, which would be effectively tetraploid and 4EBN.

Female Male Berry Set Seed Set Germination Ploidy Source
S. tuberosum S. acroglossum None None     Jackson (1999)

Crosses with other species

Jackson (1999) found 1% 2n pollen in varieties of this species.  Watanabe (1991) found that 1 of 28 plants tested (3.6%) produced 2n pollen.

Female Male Berry Set Seed Set Germination Ploidy Source
S. acroglossum S. chomatophilum Moderate Low     Ochoa (2004)
S. acroglossum S. chiquidenum Low Moderate     Ochoa (2004)
S. acroglossum S. candolleanum (as S. ambosinum) Low High     Ochoa (2004)
S. chiquidenum S. acroglossum Moderate None     Ochoa (2004)
S. candolleanum (as S. ambosinum) S. acroglossum None None     Ochoa (2004)



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