This page is a draft, part of our ongoing wild potato project. I’ll probably be adding information to the species pages through 2020 at least, but I’m making them public since they may be useful even incomplete.

Solanum iopetallum

Common Name(s):

Synonyms: S. brachycarpum, S. oxycarpum var. brachycarpum, S. verrucosum var. iopetalum

Series: Iopetala

EBN: 4

Ploidy: Hexaploid

Segregation: Unknown

Self-compatible: Unknown (probably yes)

Cytoplasm Type: D, M, W (Hosaka 2014)

Description

A widespread species from central to southern Mexico.  Plants roughly one to two feet tall.  Flowers white to violet.  Berries conical.

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 Level of Resistance Source
Wart Somewhat resistant Machida-Hirano 2015 (as S. brachycarpum)
Potato Virus X Somewhat resistant Machida-Hirano 2015 (as S. brachycarpum)
Root Knot Nematode Somewhat resistant Machida-Hirano 2015 (as S. brachycarpum)
Frost Somewhat resistant Machida-Hirano 2015 (as S. brachycarpum)
Heat Somewhat resistant Machida-Hirano 2015 (as S. brachycarpum)
Drought Somewhat resistant Machida-Hirano 2015 (as S. brachycarpum)
Potato Virus Y Somewhat resistant Chung 2011

Glykoalkaloid content

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

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

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