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Old January 6, 2017   #40
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Join Date: Feb 2006
Location: Alabama
Posts: 2,055

S. habrochaites and S. peruvianum are in the same sub-group
S. chmielewskii, S. habrochaites, S. neorickii, and S. pennelli are in the group that can make 1 way crosses to domestic tomato. S. Chilense and S. Peruvianum are genetically further away and do not cross with domestic tomato except with embryo rescue. The reason is because of differences in formation of endosperm. Study a domestic tomato seed will show a relatively large endosperm, roughly three times as large as for wild species. This difference is the primary reason Peruvianum won't cross with Lycopersicum. I'll note one exception which is with S. Arcanum. Under some circumstances S. Arcanum will cross to domestic tomato and produce viable seed.

Including Solanum lycopersicum, there are currently 13 species recognized in Solanum section Lycopersicon. Three of these species—S. cheesmaniae, S. galapagense, and S. pimpinellifolium—are fully cross compatible with domestic tomato. Four more species—S. chmielewskii, S. habrochaites, S. neorickii, and S. pennelli—can be readily crossed with domestic tomato, with some limitations. Five species—S. arcanum, S. chilense, S. corneliomulleri, S. huaylasense, and S. peruvianum—can be crossed with domestic tomato with difficulty and usually require embryo rescue to produce viable plants.
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