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Solanum microdontum

Description

Solanum microdontum distribution map
Solanum microdontum distribution map

Solanum microdontum (microdontum means “small teeth”) is primarily a Bolivian species, extending into northern Argentina.  Plants up to three feet tall.  Stolons three feet long or more.  Tubers small, less than an inch, round, light gray purple.  Flowers white to light purple.  Berries round, a bit less than an inch in diameter.

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.

Kiszonas (2010) measured the tuber pH of wild potato species and found that S. microdontum has the lowest pH measured at 5.59.  It is not known if tuber pH has any agronomic significance.

Some accessions of this species are resistant to tuber greening.

Subramanian (2017) found that at least some accessions of this species have unusually low calcium content.

Condition Type Level of Resistance Source
Alternaria solani (Early Blight) Fungus Somewhat resistant Jansky 2008
Drought Abiotic Somewhat resistant Machida-Hirano 2015
Fusarium sambucinum (Fusarium Wilt) Fungus Resistant Lynch 2003
Globodera pallida (Pale Cyst Nematode) Invertebrate Not resistant Castelli 2003
Globodera pallida (Pale Cyst Nematode) Invertebrate Not resistant Bachmann-Pfabe 2019
Globodera rostochiensis (Potato Cyst/Golden Nematode) Invertebrate Not resistant Castelli 2003
Heat Abiotic Somewhat resistant Machida-Hirano 2015
Meloidogyne spp. (Root Knot Nematode) Invertebrate Somewhat resistant Machida-Hirano 2015
Myzus persicae (Green Peach Aphid) Invertebrate Somewhat resistant Machida-Hirano 2015
Ralstonia solanacearum (Bacterial Wilt) Bacteria Somewhat resistant Machida-Hirano 2015
Pectobacterium carotovorum (Blackleg/Soft Rot) Bacteria Somewhat resistant Chung 2011, Machida-Hirano 2015
Phytophthora infestans (Late Blight) Fungus Not resistant Gonzales 2002
Phytophthora infestans (Late Blight) Fungus Somewhat resistant Machida-Hirano 2015
Phytophthora infestans (Late Blight) Fungus Somewhat resistant Bachmann-Pfabe 2019
Potato Leaf Roll Virus (PLRV) Virus Somewhat resistant Machida-Hirano 2015
Potato Virus Y (PVY) Virus Somewhat resistant Cai 2011
Synchytrium endobioticum (Wart) Fungus Somewhat resistant Machida-Hirano 2015

Glykoalkaloid content

Images

Solanum microdontum plant
Solanum microdontum plant
Solanum microdontum plant
Solanum microdontum plant
Solanum microdontum flower
Solanum microdontum flower
Solanum microdontum flowers
Solanum microdontum flowers
Tubers of the wild potato species Solanum microdontum
Solanum microdontum tubers
Tubers of the wild potato species Solanum microdontum
Solanum microdontum tubers
   
       

Cultivation

I have found seeds of this species easy to germinate using the standard conditions for S. tuberosum.  The hypocotyls of this species are dark red/purple.

Towill (1983) found that seeds of this species stored at 1 to 3 degrees C germinated at 100% after 19 years.

Bamberg (1995) found that at least some accessions of S. microdontum flower better at high temperatures than under typical temperate growing conditions.  Flowering was better when greenhouse temperatures exceeded 100 degrees F for several hours during the day.

Bamberg (2017) found a 158% increase in seed set in this species with supplemental applications of liquid fertilizer at four and seven weeks after potting.

Breeding

This species has been included in the pedigrees of at least 15 hybrid cultivars of Solanum tuberosum.

Crosses with S. tuberosum

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

Crosses with other species

Jackson (1999) found 4-30% 2n pollen in varieties of this species.

Female Male Berry Set Seed Set Germination Ploidy Source
             

References

Solanum microdontum at Solanaceae Source

Solanum microdontum at GRIN Taxonomy