|Ploidy||Diploid (2x), Triploid (3x)|
|Self-compatible||No (Whalen 1981)|
|Cytoplasm Type||W (Hosaka 2014)|
||Dunal: J. L. M. Poiret, Encycl. suppl. 3:749. 1814|
Solanum bulbocastanum (bulbocastanum presumably means something like “chestnut tuber”) is 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.
Subramanian (2017) found that different accessions of this species had both unusually low and unusually high calcium content. They were also unusually high in dry matter content.
Bethke (2017) scored wild potato species as a composite of seven resistance studies and S. bulbocastanum ranked in first place by a significant margin.
This species can survive frosts down to 27 degrees F (-3 C) (Li 1977). Vega (1995) found that this species is less frost tolerant than domesticated potato. It has the greatest resistance to potato virus Y among wild potatoes (Chung 2011).
Three major late blight resistance genes have been identified in this species: Rpi-blb1, Rpi-blb2, and RB.
|Condition||Type||Level of Resistance||Source|
|Aphids||Invertebrate||Not resistant||Alvarez 2006|
|Bacterial Wilt||Bacterium||Somewhat resistant||Machida-Hirano 2015|
|Columbia root knot nematode||Invertebrate||Resistant||Brown 1989|
|Drought||Abiotic||Somewhat resistant||Machida-Hirano 2015|
|Early Blight||Fungus||Resistant||Prasad 1980|
|Early Blight||Fungus||Somewhat resistant||Jansky 2008|
|Heat||Abiotic||Somewhat resistant||Machida-Hirano 2015|
|Late Blight||Fungus||Resistant||Machida-Hirano 2015|
|Late Blight||Fungus||Resistant||Bachmann-Pfabe 2019|
|Potato Cyst Nematode||Invertebrate||Somewhat resistant||Machida-Hirano 2015|
|Potato Cyst Nematode (G. pallida)||Invertebrate||Not resistant||Bachmann-Pfabe 2019|
|Potato Virus Y||Virus||Somewhat resistant||Cai 2011|
|Root Knot Nematode||Invertebrate||Somewhat resistant||Machida-Hirano 2015|
|Soft Rot / Blackleg||Bacterium||Somewhat resistant||Chung 2011, Machida-Hirano 2015|
|Wart||Fungus||Somewhat resistant||Machida-Hirano 2015|
I have found seeds of this species easy to germinate using the standard conditions for S. tuberosum.
Towill (1983) found that seeds of this species stored at 1 to 3 degrees C germinated at 76% after 21 years.
Bamberg (2018) found that alternating temperatures decreased germination in this species.
Crosses with S. tuberosum
|S. bulbocastanum||S. tuberosum 4x||None||None||Jackson (1999)|
|S. tuberosum 4x||S.bulbocastanum||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.