Return to Wild Potato Index Purchase tubers of Solanum juzepczukii

Solanum juzepczukii

Common Name(s) Papa amarga, Lucki, Orcco-malcco, Chocke pitu, Pinkula, Ck’aisa, Mullunku, Pocco tturu, Nasari, Sisu, Janck’o rai, Pingo (Ochoa 1990)
Aerial plant of the potato species Solanum juzepczukii
Solanum juzepczukii plant
Code juz
Synonyms  
Clade 4
Series Tuberosa
Ploidy Triploid (3x)
EBN 2
Tuberization Photoperiod
Short day
Self-compatible No
Genome
AAA
Cytoplasm Type M
Citation
Bukasov: Trudy vsecouz. sezda genetike 3:603. 1929

Description

Solanum juzepczukii distribution map
Solanum juzepczukii distribution map

S. juzepczukii (juzepczukii, in honor of Russian botanist Sergei Vasilievich Juzepczuk) is perhaps better included among the cultivated species than the wild, but as a wild species hybrid, the dividing line isn’t entirely clear.  This species is treated more like a wild species in breeding programs.

This species is cultivated primarily in the highest elevations of the Andes in Peru, Bolivia, and northern Argentina, where S. tuberosum ssp. andigenum will not survive due to frost.  Plants grow about 12 to 14 inches tall, although some take a more wild-type rosette form.  Stolons of some varieties are rather long, as much as 18 inches, although most are more like domesticated potatoes.  Tubers are similar in size and form to stenotomum type andigena varieties.  Most varieties have blue skin and some have blue flesh, less commonly white skin and yellow flesh.  Flowers usually blue.  S. juzepczukii is high in glycoalkaloids and is only consumed after processing into chuno.  This species is the most wild looking of the hybrid species, with plants that appear very similar to S. acaule, particularly in the early stages of growth.

A chart showing the relationships between Andean domesticated potatoes
Relationships Between Andean Domesticated Potatoes

The origin of S. juzepczukii is believed to be as a hybrid between S. acaule and diploid S. tuberosum ssp. andigenum (S. stenotomum).  S. acaule is tetraploid but 2EBN, while the stenotomum type diploid parent would have been diploid and 2EBN.  They are compatible because they have the same EBN, but the cross of a tetraploid and a diploid results in triploid progeny.  Like most triploids, S. juzepczukii is effectively sterile, although it is able to cross to species with higher ploidies.  So, for example, while S. juzepczukii does not self-pollinate or cross with other varieties, it can be crossed to tetraploid S. tuberosum ssp. andigenum.

S. juzepczukii has been “artificially” synthesized by crossing the putative parent species.  I’m not sure why this hasn’t been done more often.  It is much easier than crossing S. juzepczukii to domesticated potatoes.

Resistances

Condition Type Level of Resistance Source
 Frost    Somewhat resistant  Machida-Hirano 2015
 Potato Virus X    Somewhat resistant  Machida-Hirano 2015

Glykoalkaloid content

Osman (1978) found that total glycoalkaloids ranged from 11.7 to 46.8mg/kg, so this species straddles the generally accepted safety limit of 20mg/kg.  Some varieties are edible fresh, while others must be processed to reduce glycoalkaloid content.

Images

Aerial plant of the potato species Solanum juzepczukii
Solanum juzepczukii plant
Aerial plant of the potato species Solanum juzepczukii
Solanum juzepczukii plant
Aerial plant of the potato species Solanum juzepczukii
Solanum juzepczukii plant
Flower of the potato species Solanum juzepczukii
Solanum juzepczukii flower
       
       

Cultivation

Breeding

Crosses with S. tuberosum

Crossing S. juzepczukii to S. tuberosum ssp. andigenum produces tetraploids (Ochoa 1990).

Female Male Berry Set
Seed Set Germ Ploidy Source
             

Crosses with other species

Female Male Berry Set
Seed Set Germ Ploidy Source
             

References

Solanum juzepczukii at Solanaceae Source

Solanum juzepczukii at GRIN Taxonomy

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