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Solanum hjertingii

Common Name(s) 
Solanum hjertingii plant
Solanum hjertingii plant
Codehjt
SynonymsS. fendleri var. physaloides, S. leptosepalum, S. matehualae
Clade1+4
SeriesLongipedicellata
PloidyTetraploid (4x)
EBN2
Tuberization Photoperiod
Short day
Self-compatibleProbably
Genome
AABB
Cytoplasm TypeD (Hosaka 2014)
Citation
Hawkes: A revision of the tuber-bearing Solanums, 2nd ed: 123, 171. 1963.

Description

Solanum hjertingii distribution map
Solanum hjertingii distribution map

Solanum hjertingii (hjertingii in honor of Danish botanist Jens Peter Knudsen Hjerting) is a northern Mexican species, primarily Coahuila and Nuevo Leon.  Small plants, reaching about 7 to 14 inches tall.  Violet flowers.

This species is an allotetraploid, carrying clade 1 and clade 4 genomes.  Hawkes (1990) expected an AABB genome configuration for this species, confirmed by Pendinen (2008), who determined that the A genome contributor was S. verrucosum and the B genome contributor was one of S. cardiophyllum, S. ehrenbergii, or S. jamesii.  This species appears to be most closely related to S. stoloniferum (Van den Berg 2002).

Resistances

S. hjertingii is very resistant to bruising compared to domesticated varieties (Gubb 1989) and has low levels of polyphenol oxidase, an enzyme implicated in potato browning (Sim 1997, Brown 1999).

Vega (1995) found that this species is less frost tolerant than domesticated potato.

ConditionTypeLevel of ResistanceSource
Aphids Somewhat resistantRadcliffe 1970
Soft Rot / Blackleg Somewhat resistantMachida-Hirano 2015 
Tuber Blackening Somewhat resistantMachida-Hirano 2015 

Glykoalkaloid content

I have found no account of tuber glycoalkaloids in S. hertingii.  Foliar glycoalkaloids appear to consist primarily of solanine and chaconine (Gregory 1981).

Images

Solanum hjertingii plant
Solanum hjertingii plant
Solanum hjertingii plant
Solanum hjertingii plant
Solanum hjertingii flower
Solanum hjertingii flower
Solanum hjertingii inflorescence
Solanum hjertingii inflorescence
Solanum hjertingii flower
Solanum hjertingii flower
Solanum hjertingii flower
Solanum hjertingii flower
Berries of the wild potato species Solanum hjertingii
Solanum hjertingii berries
 
    

Cultivation

I have found seeds of this species easy to germinate using the standard conditions for S. tuberosum.

Breeding

Culley (2002) found that triploid progeny of diploid S. tuberosum x S. hjertingii were resistant to bruising and low in polyphenol oxidase.

Crosses with S. tuberosum

FemaleMaleBerry Set
Seed SetGermPloidySource
S. hjertingiiS. tuberosum (4x)
NoneNone  Jackson (1999)
S. tuberosum (2x)S. hjertingiiYesYesYes3xCulley (2002)
S. tuberosum (4x)
S. hjertingiiLowNone  Jackson (1999)

Crosses with other species

Watanabe (1991) found that 9.1% of varieties of this species produced 2n pollen and Jackson (1999) found 6-21%, which would be effectively octaploid and probably 4EBN.

FemaleMaleBerry Set
Seed SetGermPloidySource
       

References

Solanum hjertingii at Solanaceae Source

Solanum hjertingii at GRIN Taxonomy

Solanum hjertingii at CIP

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