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Solanum iopetalum

Common Name(s) 
Solanum iopetalum plant
Solanum iopetalum plant
Codeiop
SynonymsS. brachycarpum, S. oxycarpum var. brachycarpum, S. verrucosum var. iopetalum
Clade3+4
SeriesDemissa
PloidyHexaploid (6x)
EBN4
Tuberization Photoperiod
Short day
Self-compatibleYes (Marks 1965)
Genome
AABBPP
Cytoplasm TypeD, 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.

ConditionTypeLevel of ResistanceSource
DroughtAbioticSomewhat resistantMachida-Hirano 2015 (as S. brachycarpum)
FrostAbioticSomewhat resistantMachida-Hirano 2015 (as S. brachycarpum)
HeatAbioticSomewhat resistantMachida-Hirano 2015 (as S. brachycarpum)
Potato Virus XVirusSomewhat resistantMachida-Hirano 2015 (as S. brachycarpum)
Potato Virus YVirusSomewhat resistantChung 2011
Root Knot NematodeInvertebrateSomewhat resistantMachida-Hirano 2015 (as S. brachycarpum)
WartFungusSomewhat resistantMachida-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
 
    

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.

Breeding

Crosses with S. tuberosum

FemaleMaleBerry Set
Seed SetPloidyGermSource
S. iopetalum (as S. iopetalum and S. brachycarpum)S. tuberosumModerateModerate   Jackson (1999)
S. tuberosumS. iopetalumLowHigh  Jackson (1999)
S. tuberosumS. iopetalum (as S. brachycarpum)NoneNone  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.

FemaleMaleBerry Set
Seed SetPloidyGermSource
       

References

Solanum iopetalum at Solanaceae Source

Solanum iopetalum at GRIN Taxonomy

Solanum iopetalum at CIP

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