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Plant Physiol, December 2000, Vol. 124, pp. 1605-1614
Arabidopsis Species Hybrids in the Study of Species Differences
and Evolution of Amphiploidy in Plants1
Mikhail E.
Nasrallah,*
Krithika
Yogeeswaran,
Stephen
Snyder, and
June B.
Nasrallah
Department of Plant Biology, Cornell University, Ithaca, New York
14853
It is estimated that 5 million years of evolution separate
Arabidopsis thaliana from its close relative
Arabidopsis lyrata. The two taxa differ by many
characteristics, and together they exemplify the differentiation of
angiosperms into self-fertilizing and cross-fertilizing species as well
as annual and perennial species. Despite their disparate life
histories, the two species can be crossed to produce viable and
vigorous hybrids exhibiting heterotic effects. Although pollen sterile,
the hybrids produce viable ovules and were used as female parent in
backcrosses to both parental species. The resulting backcross plants
exhibited transgressive variation for a number of interesting
developmental and growth traits as well as negative nuclear/cytoplasmic
interactions. Moreover, the genesis of a fertile amphidiploid
neospecies, apparently by spontaneous somatic doubling in an
interspecific hybrid, was observed in the laboratory. The mechanisms
responsible for the generation of amphiploids and the subsequent
evolution of amphiploid genomes can now be studied through direct
observation using the large arsenal of molecular tools available for Arabidopsis.
1
This work was supported by the National Science
Foundation (grant no. IBN-0077289).
*
Corresponding author; e-mail men4{at}cornell.edu; fax
607-255-5407.
© 2000 American Society of Plant Physiologists
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