Plant Physiology Preview
Published on November 6, 2003; 10.1104/pp.103.027490
Received May 25, 2003
Returned for revision June 27, 2003
Accepted August 31, 2003
Impaired Induction of the Jasmonate Pathway in the Rice Mutant hebiba
Michael Riemann *, Axel Müller , Arthur Korte , Masaki Furuya , Elmar W. Weiler , and Peter Nick
Biologisches Institut II, Albert-Ludwigs-Universität Freiburg, Schänzlestrasse 1, 79104 Freiburg, Germany (M.R., A.K., P.N.); Lehrstuhl für Pflanzenphysiologie, Ruhr-Universität Bochum, 44793 Bochum, Germany (A.M., E.W.W.); and Hitachi Advanced Research Laboratory, Hatoyama, Saitama 350-0395, Japan (M.F.)
* Corresponding author; email: michael.riemann{at}biologie.uni-freiburg.de.
The elongation of rice (Oryza sativa) coleoptiles is inhibited by light, and this photoinhibition was used to screen for mutants with impaired light response. In one of the isolated mutants, hebiba, coleoptile elongation was stimulated in the presence of red light, but inhibited in the dark. Light responses of endogenous indolyl-3-acetic acid and abscisic acid were identical between the wild type and the mutant. In contrast, the wild type showed a dramatic increase of jasmonate heralded by corresponding increases in the content of its precursor o-phytodienoic acid, whereas both compounds were not detectable in the mutant. The jasmonate response to wounding was also blocked in the mutant. The mutant phenotype was rescued by addition of exogenous methyl jasmonate and o-phytodienoic acid. Moreover, the expression of O. sativa 12-oxophytodienoic acid reductase, an early gene of jasmonic acid-synthesis, is induced by red light in the wild type, but not in the mutant. This evidence suggests a novel role for jasmonates in the light response of growth, and we discuss a cross-talk between jasmonate and auxin signaling. In addition, hebiba represents the first rice mutant in which the induction of the jasmonate pathway is impaired providing a valuable tool to study the role of jasmonates in Graminean development.
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