Plant Physiology 132:1755-1767 (2003)
© 2003 American Society of Plant Biologists
PLANTS INTERACTING WITH OTHER ORGANISMS
Convergent Responses to Stress. Solar Ultraviolet-B Radiation and Manduca sexta Herbivory Elicit Overlapping Transcriptional Responses in Field-Grown Plants of Nicotiana longiflora1,[w]
Miriam M. Izaguirre,
Ana L. Scopel,
Ian T. Baldwin and
Carlos L. Ballaré*
Ifeva, Consejo Nacional de Investigaciones Científicas y
Técnicas, and Universidad de Buenos Aires, Avenida San Martín
4453, C1417DSE Buenos Aires, Argentina (M.M.I., A.L.S., C.L.B.); and Max Plank
Institute for Chemical Ecology, Department of Molecular Ecology, Winzerlaer
Strasse 10, D–07745 Jena, Germany (I.T.B.)
The effects of solar ultraviolet (UV)-B (280–315 nm) on plants have
been studied intensively over the last 2 decades in connection with research
on the biological impacts of stratospheric ozone depletion. However, the
molecular mechanisms that mediate plant responses to solar (ambient) UV-B and
their interactions with response mechanisms activated by other stressors
remain for the most part unclear. Using a microarray enriched in wound- and
insect-responsive sequences, we examined expression responses of 241 genes to
ambient UV-B in field-grown plants of Nicotiana longiflora Cav.
Approximately 20% of the sequences represented on the array showed
differential expression in response to solar UV-B. The expression responses to
UV-B had parallels with those elicited by simulated Manduca sexta
herbivory. The most obvious similarities were: (a) down-regulation of several
photosynthesis-related genes, and (b) up-regulation of genes involved in fatty
acid metabolism and oxylipin biosynthesis such as HPL (hydroperoxide
lyase),  -DIOX (alpha-dioxygenase), LOX
(13-lipoxygenase), and AOS (allene oxide synthase). Genes encoding a
WRKY transcription factor, a ferredoxin-dependent glutamate-synthase, and
several other insect-responsive genes of unknown function were also similarly
regulated by UV-B and insect herbivory treatments. Our results suggest that
UV-B and caterpillar herbivory activate common regulatory elements and provide
a platform for understanding the mechanisms of UV-B impacts on insect
herbivory that have been documented in recent field studies.
Article, publication date, and citation information can be found at
www.plantphysiol.org/cgi/doi/10.1104/pp.103.024323.
1 This work was supported by Agencia Nacional de Promoción
Científica y Tecnológica (grant to C.L.B. and A.L.S.), by the
Guggenheim Foundation (grant to C.L.B.), by the Max Plank Gesellschaft (grant
to I.T.B.), and by the Consejo Nacional de Investigaciones Científicas
y Técnicas (fellowship to M.M.I.). C.L.B. and A.L.S. are Investigators
of Consejo Nacional de Investigaciones Científicas y
Técnicas.
[w] The online version of this article contains Web-only data. The supplemental
material is available at
http://www.plantphysiol.org.
*
Corresponding author; e-mail
ballare{at}ifeva.edu.ar;
fax 54-11-4514-8730.
Received March 26, 2003;
returned for revision April 15, 2003;
accepted April 26, 2003.
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