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Genetic selection and variation
Variegation
Variegation is a term that describes
a leaf or flower that has two or
more colors in a distinct alternating
pattern.
In some cases, variegation is caused
by a mutation in the meristem that
results in a chimera.
Other sources of variegation
include:
Pattern variegation
Transposons
Pathogen infection
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Genetic selection and variation
Variegation
Pattern variegation is a genetic
trait of the cultivar.
It is an inherited trait and can
be fixed by selection and seed
propagation.
Caladium
The pattern is due to different
cells in a tissue expressing
color genes. This is not a
chimera
Lily
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Genetic selection and variation
Variegation
One kind of pattern variegation is
a repeating striped pattern like is
seen in grasses and pines.
Pinus densiflora ‘Oculus-draconis’
Eye of the dragon red pine
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Miscanthus sinensis ‘Zebrinus’
Zebra grass
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Genetic selection and variation
Variegation
A transposon is a movable
genetic element. Transposons
are also called jumping genes.
They can randomly move
about
the
chromosome
creating genetic mosaics.
They were discovered by
Barbara McClintock working
with Indian corn.
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Genetic selection and variation
Variegation
Transposons can cause spectacular
variegation in flowers and leaves.
The effect is splashes of color.
They can be distinguished from
chimeras because the variegation
pattern is inherited from seed.
Barberry
Verbena
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Hypericum
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Genetic selection and variation
Variegation
Variegation can also occur when
a plant is infected with a virus
that creates the differences in
color.
Leaf variegation in Abutilon
In some cases they cause a
variegated leaf or flower color
and are perpetuated during
propagation.
Floral variegation in Camellia
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Genetic selection and variation
Variegation
At one time, variegation in tulips
was caused by a viral infection.
This was caused tulip breaks and
was the cause for tulipomania in
the Netherlands.
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