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Teosinte is photoperiod sensitive (i.e. floral initiation requires short days).

Teosinte in Missouri
(long day environment),
4 months after planting.

Teosinte in Puerto Rico
(day neutral environment),
7 weeks aftr planting.

Teosinte in the growth chamber
(12 hr light; 12 hr dark),
6 weeks after planting.
The B73-teosinte F1 is very unadapted, but backcrossing quickly recovers B73 phenotypes.

Seeds of B73 (left),
teosinte (right)

B73 (left), teosinte (middle),
and the F1 hybrid (right).

F1 ear of B73 x teosinte.
The cob will "shatter" with minimal pressure. Note the
seed "squeezing" out the top
of the partially open fruitcase.

The F1 plant is very late (photoperiod sensitive) and tillered.

The plant is highly
branched. Lateral branches
often end in male flowers,
and there are many
ears per plant.

A sample of BC1 ears (left) compared to B73 (right).
Diversity within maize inbreds: the NAM founder parents.

Ears of the 25DL, B73, and Mo17.

Plant morphological differences in the 27DL and Mo17.
We've created some diverse synthetic populations for
testing QTL models and conducting breeding experiments.

NAM Synthetic: The 27 NAM founders were
recombined to make the NAM-Synthetic.

NAM Synthetic: Individual ear phenotypes
span the full range for kernel type and color,
and ear shape and size.

Teosinte Synthetic: Derived by random mating
BC1 plants from 11 parviglumis accessions in
the B73 background, the Teo-synthetic is
75% B73 and 25% teosinte. Not very pretty,
but should be interesting!