Wild species guidelines

 Species

 Mating System

Daylength Response

Sowing (Davis)

 Flowering

Pollination Method

Plants / gener

Plants / pot

Notes

S. lycopersicum  var. cerasiforme

selfing (SC)

day neutral

February - April

year round

OP

6-9

2 (or field)

 

S. pimpinellifolium

facultative (SC) pops

mostly day neutral

February

year round

mass sib

75

5

Facultative accessions are grown in greenhouse to prevent outcrossing.

S. pimpinellifolium

selfing (SC) pops

day neutral

April

year round

OP

6-9

5 (or field)

 

S. cheesmaniae,
S. galapagense

selfing (SC)

short day

November

Fall/Winter/Spring

self

10

2

Slow growing; long days suppress flowering.

S. chmielewskii

facultative (SC)

day neutral

May

year round

mass sib

75

5

 

S. neorickii

selfing (SC)

day neutral

May

year round

mass sib

15

5

 

S. arcanum

mostly SI, some SC

day neutral

June

year round

mass sib

75

5

 

S. peruvianum,

S. corneliomulleri,

S. huaylasense

outcrossing (SI) or

mixed (SI & SC)

day neutral, some short day

June

mostly year round

mass sib

75

5

 

S. chilense

outcrossing (SI)

short day

July

Fall/Winter/Spring

mass sib

75

5

Water sparingly.

S. habrochaites

 

outcrossing (SI) pops

short day

July

 

Fall/Winter/Spring

mass sib

75

3-5

Forms edema on leaves under high humidity.

S. habrochaites

facultative (SC) pops

short day

July

Fall/Winter/Spring

mass sib

15

3-5

Southern SC pops more daylength sensitive.

S. pennellii

outcrossing (SI) or mixed (SC/SI)

day neutral

June

year round

mass sib

75

5

Use well-drained soil and water sparingly.

S. lycopersicoides

outcrossing (SI)

short day

August

Fall/Winter/Spring

mass sib

75

3

Up to 6 months fruit ripening

S. sitiens

outcrossing (SI)

short day or day neutral

August

year round

mass sib

75

3

Up to 6 months fruit ripening.  Water sparingly or graft onto hybrid rootstock.

S. juglandifolium

outcrossing (SI)

short day

August

Fall/Winter/Spring

mass sib

75

3

6-8 months fruit ripening.

S. ochranthum

outcrossing (SI)

short day

August

Fall/Winter/Spring

mass sib

75

3

6-8 months fruit ripening. 

 

SC=self-compatible, SI=self-incompatible

Suggested planting times are based on each species' photoperiod preferences, as well as space and workflow criteria specific to the TGRC, and can be modified as needed. Some groups, e.g. S. lycopersicum, chmielewskii, neorickii and pimpinellifolium, thrive at almost any time of year.

OP=open pollinated under field conditions (i.e. mostly selfing); mass sib = cross pollination of all plants in a population using a bulk pollen sample.

The number of plants grown in each seed multiplication cycle are based on the TGRC's goal of maintaining genetic diversity and are provided for information only.

The suggested numbers of plants per pot (ca. 2L vol) are designed to promote flowering and limit vegetative growth by crowding plants.

S. habrochaites
S. habrochaites plants in the greenhouse. [photo R.T. Chetelat]
S. juglandifolium
S. juglandifolium plants with fruit. [photo R.T. Chetelat]
S. pennellii LA2719 plants
S. pennellii LA2719 starting to flower. [photo R.T. Chetelat]
Fruit set on S. corneliomulleri
Fruit set on S. corneliomulleri in greenhouse. [photo C.M. Rick]