Solanum cajamarquense

Description

Solanum cajamarquense distribution map
Solanum cajamarquense distribution map

Solanum cajamarquense is an unusual speces, with a small distribution in northern Peru.  It grows at mid-elevations of the Andes from about 6500 to 8500 feet.  Plants roughly 16 to 20 inches tall.  Stolons long, exceeding two feet.  Tubers small and moniliform, like beads on a string.  Flowers white.  Berries small, less than 1/2 inch, round, striped.  The specific epithet, cajamarquense, refers to Cajamarca Department, Peru.

Li (2018) placed this species in Clade 3, a group of Andean diploids, but closely neighboring Clade 1+2, North American 1EBN diploid species.

Resistances

S. cajamarquense appears to have unique late blight resistance genes (Lindqvist-Kreuze 2010).  Vega (1995) found that this species is about as frost tolerant as domesticated potato.

Some plants of this species produce very heavy trichomes, which presumably acts as an insect deterrent.

Condition Type Level of Resistance Source
Phytophthora infestans (Late Blight) Fungus Resistant Gonzales 2002, Perez 2007

Glykoalkaloid content

Images

Solanum cajamarquense seedling
Solanum cajamarquense seedling
Solanum cajamarquense plant
Solanum cajamarquense plant
Solanum cajamarquense plant
Solanum cajamarquense plant
Solanum cajamarquense plant
Solanum cajamarquense plant
Solanum cajamarquense flower
Solanum cajamarquense flower
Solanum cajamarquense flowers
Solanum cajamarquense flowers
Above ground plant of the wild potato species Solanum cajamarquense
Solanum cajamarquense plant
Heavy trichome development on the wild potato species Solanum cajamarquense
Solanum cajamarquense trichomes
Flower of the wild potato species Solanum cajamarquense
Solanum cajamarquense flower
     

Cultivation

I have found germination of this species to be very slow, taking between one and three months.  I haven’t had much luck getting tubers bigger than pinheads from this species, even when the plants are left to grow into November or December.

The pesticide carbofuran has been observed to reduce flowering in this species (Centeno-diaz 2007).

Accessions Evaluated

The following accessions were examined to prepare this profile.  I have evaluated 2/2 accessions currently available from the US Potato Genebank.

PI 230522

Poor germination and relatively slow seedling growth.  Dark colored seedlings.  Leaves with purple undersides.  Some with purple veins as well.  Some with blue flowers.  The GRIN page for this accession lists it as S. cajamarquense, but also indicates that it is hybrid seed with PI 275149, which is an accession of S. boliviense.  I will need to inquire with the genebank to see if there is more detail about that.

PI 310988

Good germination and relatively strong seedling growth.  Light colored, pubescent seedlings.  Leaves with green undersides.

Breeding

Crosses with S. tuberosum

Female Male Berry Set
Seed Set Germ Ploidy Source
             

Crosses with other species

Female Male Berry Set
Seed Set Germ Ploidy Source
             

References

Solanum cajamarquense at Solanaceae Source

Solanum cajamarquense at GRIN Taxonomy

Solanum cajamarquense at CIP

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