Solanum maglia

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 maglia

Synonyms: none

Series: Maglia

EBN: 2

Ploidy: Diploid and Triploid

Segregation: Unknown

Self-compatible: No

Cytoplasm Type: Unknown

Description

Solanum maglia is a South American species, found primarily in Chile, but also in one location in Argentina.  It is a low-elevation, coastal species.  It is the only wild potato that has a significant distribution in Chile.  According to Brucher (1990), S. maglia was the first wild potato species to be described.  S. maglia is sometimes known as Darwin’s Potato, but it isn’t clear if Darwin ever saw this species.

S. maglia might have been used as a food plant in the past and possibly even currently by the Araucarian natives of Chile.  Unfortunately, the evidence for this is not particularly clear.  It is possible that Chilotanum type potatoes have been mistaken for S. maglia.  The relatively high level of glykoalkaloids in this species should cast some doubt.

Both diploid and triploid populations exist, but triploids appear to be more common.  The triploids are effectively sterile.  This is an interesting puzzle.  The existence of triploids would seem to suggest that there is a population of tetraploids somewhere or that the triploids were produced by hybridization with another species.  It is possible that tetraploids once existed and have gone extinct, leaving the triploids as a remnant.

Spooner (2012) evaluated S. maglia to determine whether it might be a progenitor of the Chilotanum group of potatoes and declared the evidence inconclusive.  Genetically, it groups with Chilotanum potatoes, so it probably has played at least a small role in the evolution of Chilotanum.

Volkov (2003) suggests that S. maglic may have originated as an allotriploid by the combination of S. microdontum and S. acaule or a closely related species.  It isn’t clear how this idea accounts for the presence of diploid populations.

Unfortunately, S. maglia appears to have little genetic diversity remaining.  There are few populations in the wild and are triploid and sterile.

Weinheimer (1966) found that S. maglia was a particularly effective rootstock for forcing flower production in the variety Russet Burbank.  It produced more flowers and berries than other rootstocks tested.

Condition Level of Resistance Source
 Verticillium    
 Aphids    
 Potato Virus A  Moderate  Webb 1961
 Potato Virus X  Moderate  Webb 1961
 Potato Virus Y    
 Wart    
 Nematodes    
 Leaf Hoppers    
 Flea Beetles    

Cultivation

Solanum maglia grows along the Chilean coast, where the climate is cool and foggy, but not necessarily high in precipitation.  Accounts about the drought tolerance of this species vary.  It grows well with drip irrigation.

Even the diploid collections of this species are poor pollen producers (Brucher 1990), so seed production may be difficult.

Crosses with S. tuberosum

Sutton (1909) described making hundreds of crosses of S. tuberosum to S. maglia before obtaining a single hybrid.

Female Male Berry Set Seed Set Germination Ploidy Source
             
             
             
             
             
             
             
             
             

Crosses with other species

 

Female Male Berry Set Seed Set Germination Ploidy Source
 S. maglia  S. kurtzianum  Low Low      Ispizua 1999
 S. kurtzianum  S. maglia  Low Low      Ispizua 1999
             
             
             
             
             
             
             

Glykoalkaloid content

S. maglia contains solanine and chaconine, just as do common domesticated potatoes.  This is not terribly surprising, given that modern potatoes primarily derive from Chilotanum.  Distl (2009) found a level of 144 mg/100g for this species, which puts it far outside the safe zone for edibility.   Johns (1990) listed a level of 56mg/100g, but the accession tested was later reclassified as S. tuberosum.

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