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Solanum iopetalum

Common Name(s)  
Tubers of the wild potato species Solanum iopetalum
Solanum iopetalum tubers
Code iop
Synonyms S. brachycarpum, S. oxycarpum var. brachycarpum, S. verrucosum var. iopetalum
Clade 3+4
Series Demissa
Ploidy Hexaploid (6x)
EBN 4
Tuberization Photoperiod
Short day
Self-compatible Yes (Marks 1965)
Genome
AABBPP
Cytoplasm Type D, M, W (Hosaka 2014)
Citation
Hawkes: Bull. Imp. Bur. Pl. Breed. Genet., Cambridge 30. 1944.

Description

Solanum iopetalum distribution map
Solanum iopetalum distribution map

Solanum iopetalum (iopetalum means “purple petalled”) is a widespread species from central to southern Mexico.  Plants roughly one to two feet tall.  Flowers white to violet.  Berries conical.

Resistances

This species can survive frosts down to 26 degrees F (-3.5 C) (Li 1977, as S. brachycarpum).  Vega (1995) found that this species is less frost tolerant than domesticated potato.

Condition Type Level of Resistance Source
Drought Abiotic Somewhat resistant Machida-Hirano 2015 (as S. brachycarpum)
Early Blight Fungus Not resistant Jansky 2008
Frost Abiotic Somewhat resistant Machida-Hirano 2015 (as S. brachycarpum)
Golden nematode (G. rostochiensis) Invertebrate Somewhat resistant Castelli 2003
Heat Abiotic Somewhat resistant Machida-Hirano 2015 (as S. brachycarpum)
Late Blight Fungus Resistant Gonzales 2002
Late Blight Fungus Not resistant Bachmann-Pfabe 2019
Potato Cyst Nematode (G. pallida) Invertebrate Not resistant Castelli 2003
Potato Virus X Virus Somewhat resistant Machida-Hirano 2015 (as S. brachycarpum)
Potato Virus Y Virus Somewhat resistant Cai 2011
Root Knot Nematode Invertebrate Somewhat resistant Machida-Hirano 2015 (as S. brachycarpum)
Soft rot (P. carotovorum) Bacteria Not resistant Chung 2011
Wart Fungus Somewhat resistant Machida-Hirano 2015 (as S. brachycarpum)

Glykoalkaloid content

Sarquis (2000) measured the total glycoalkaloid content of tubers of an accession of this species at 76.2 mg / 100g, a level almost four times the safety limit.

Images

Solanum iopetalum plant
Solanum iopetalum plant
Solanum iopetalum stem
Solanum iopetalum stem
Solanum iopetalum flowers
Solanum iopetalum flowers
Solanum iopetalum plant
Solanum iopetalum plant
Flowers of the wild potato species Solanum iopetalum
Solanum iopetalum flowers
Flower of the wild potato species Solanum iopetalum
Solanum iopetalum flower
Flower of the wild potato species Solanum iopetalum
Solanum iopetalum flower
Tubers of the wild potato species Solanum iopetalum
Solanum iopetalum tubers
       

Cultivation

I have found seeds of this species easy to germinate using the standard conditions for S. tuberosum.  The USDA potato genebank has observed that germination of some accessions of this species is inhibited by GA3 (Bamberg 1999).  Bamberg (2018) found that alternating temperatures decreased germination in this species.

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

Breeding

Crosses with S. tuberosum

Female Male Berry Set
Seed Set Ploidy Germ Source
S. iopetalum (as S. iopetalum and S. brachycarpum) S. tuberosum Moderate Moderate      Jackson (1999)
S. tuberosum S. iopetalum Low High     Jackson (1999)
S. tuberosum S. iopetalum (as S. brachycarpum) None None     Jackson (1999)

Crosses with other species

Watanabe (1991) found that 9.3% of varieties of this species produced 2n pollen and Jackson (1999) found 2-15%, which would be effectively dodecaploid and 8EBN.

Female Male Berry Set
Seed Set Ploidy Germ Source
             

References

Solanum iopetalum at Solanaceae Source

Solanum iopetalum at GRIN Taxonomy

Solanum iopetalum at CIP

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