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 bulbocastanum

Common Name(s):

Synonyms: S. symphisicaulis

Series: Bulbocastana

EBN: 1

Ploidy: Diploid

Segregation: Disomic

Self-compatible: No

Cytoplasm Type: W (Hosaka 2014)


A widespread species ranging from northern Mexico south to Guatemala and Honduras, growing under both dryland and woodland conditions.  Plants reach about three feet tall.  Simple leaves.  Flowers white to light yellow.  Round berries.

This species can survive frosts down to 27 degrees F (-3 C) (Li 1977).  It has the greatest resistance to potato virus Y among wild potatoes (Chung 2011).

Condition Level of Resistance Source
 Late Blight  Resistant  Machida-Hirano 2015
 Wart  Somewhat resistant  Machida-Hirano 2015
 Bacterial Wilt  Somewhat resistant  Machida-Hirano 2015
 Soft Rot / Blackleg  Somewhat resistant  Machida-Hirano 2015
 Aphids  Resistant  Machida-Hirano 2015
 Potato Cyst Nematode  Somewhat resistant  Machida-Hirano 2015
 Root Knot Nematode  Somewhat resistant  Machida-Hirano 2015
 Heat  Somewhat resistant  Machida-Hirano 2015
 Drought  Somewhat resistant  Machida-Hirano 2015
Potato Virus Y Somewhat resistant Chung 2011

Glykoalkaloid content


Bamberg (2018) found that alternating temperatures decreased germination in this species.


Crosses with S. tuberosum

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

Crosses with other species

Watanabe (1991) found that 5.9% of varieties of this species produced 2n pollen and Jackson (1999) found 2-4%, which would be effectively tetraploid and 2EBN.  S. bulbocastanum x S. cardiophyllum hybrids produced 2n pollen in 9.1% of plants.

Female Male Berry Set Seed Set Germination Ploidy Source



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