Researchers from University of California, Davis (UC Davis) have released
the first comprehensive
[www.isaaa.org] genome
assembly of lettuce and the huge Compositae plant family.

Garden lettuce (Lactuca sativa) includes a number of lettuce types, ranging
from iceberg to romaine, is the most valuable fresh vegetable and one of the
10 most valuable crops, overall, in the United States. Lettuce is a member
of the Compositae family, which includes the good, the bad, and the ugly of
the plant world, from the daisy and sunflower to ragweed and the dreaded
star thistle.

The research team found that specific
[www.isaaa.org] genes
in the lettuce genome were consistent with certain physical traits such as
the production of a rubber-containing milky sap. This has also been found in
taxonomically distinct species, such as the rubber tree. The study also
found that somewhere during the evolution of lettuce about 45 million years
ago, its genome was "triplicated." As a result, one-fourth of the genome
appears in multiple related regions. As genomic duplications give plant
species an advantage in colonizing new environments, the ancient
triplication in lettuce might, in part, explain the success of the
Compositae plant family.

[blogs.ucdavis.edu]
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