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Plant Physiol, September 2001, Vol. 127, pp. 212-221
Three Tnt1 Subfamilies Show Different Stress-Associated Patterns
of Expression in Tobacco. Consequences for Retrotransposon Control and
Evolution in Plants
Thierry
Beguiristain,
Marie-Angèle
Grandbastien,
Pere
Puigdomènech, and
Josep M.
Casacuberta*
Departament Genètica Molecular, Institut de Biologia
Molecular de Barcelona (Consejo Superior de Investigaciones
Científicas), Barcelona, Spain (T.B., P.P.,
J.M.C.); and Laboratoire de Biologie Cellulaire, Institut National de
la Recherche Agronomique, Versailles, France (M.-A.G.)
The genomes of most Nicotiana species contain three
different subfamilies of the Tnt1 retrotransposon, which differ
completely in their U3 sequence, whereas the rest of the sequence is
relatively constant. The results presented here show that all three
Tnt1 subfamilies are expressed in tobacco (Nicotiana
tabacum) and that the U3 sequence variability correlates with
differences in the pattern of expression of the Tnt1 elements. Each of
the three Tnt1 subfamilies is induced by stress, but their promoters
have a different response to different stress-associated signaling molecules. The Tnt1A subfamily is particularly strongly induced by
elicitors and methyl jasmonate, whereas expression of the Tnt1C subfamily is more sensitive to salicylic acid and auxins. The direct
relationship between U3 sequence variability and differences in the
stress-associated expression of the Tnt1 elements present in a single
host species gives support to our model that postulates that
retrotransposons have adapted to their host genomes through the
evolution of highly regulated promoters that mimic those of the
stress-induced plant genes. Moreover, here we show that the analysis of
the transcriptional control of a retrotransposon population such as
Tnt1 provides new insights into the study of the complex and still
poorly understood network of defense- and stress-induced plant signal
transduction pathways.
*
Corresponding author; e-mail jcsgmp{at}cid.csic.es; fax
34-93-204-59-04.
© 2001 American Society of Plant Physiologists
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