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Published on April 23, 2008; 10.1104/pp.108.119321

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Received March 18, 2008
Accepted April 8, 2008

Induction of the Arabidopsis PHO1;H10 gene by 12-oxo-phytodienoic acid but not jasmonic acid via a CORONATINE INSENSTIVE 1-dependent pathway

Cecile Ribot , Celine Zimmerli , Edward E. Farmer , Philippe Reymond , and Yves Poirier *

Departement de Biologie Moleculaire Vegetale, Biophore, Universite de Lausanne, CH-1015 Lausanne, Switzerland

* Corresponding author; email: yves.poirier{at}unil.ch.

Expression of AtPHO1;H10, a member of the Arabidopsis thaliana PHO1 gene family, is strongly induced following numerous abiotic and biotic stresses, including wounding, dehydration, cold, salt, and pathogen attack. AtPHO1;H10 expression by wounding was localized to the cells in the close vicinity of the wound site. AtPHO1;H10 expression was increased by application of the jasmonic acid (JA) precursor 12-oxo-phytodienoic acid (OPDA), but not by JA or coronatine. Surprisingly, induction of AtPHO1;H10 by OPDA was dependent on the presence of CORONATINE INSENSITIVE 1 (COI1). The expression of AtPHO1;H10 in the OPDA reductase 3-deficient (opr3) mutant was comparable to wild type following both wounding and dehydration, and was also dependent on COI1. In contrast, induction of AtPHO1;H10 expression by exogenous ABA was independent of the presence of either OPDA or COI1, but was strongly decreased in the ABA insensitive mutant abi1-1. The involvement of the ABA pathway in regulating AtPHO1;H10 was distinct between wounding and dehydration, with induction of AtPHO1;H10 by wounding being comparable to wild type in the ABA-deficient mutant aba1-3 and abi1-1, while a strong reduction in AtPHO1;H10 expression occurred in aba1-3 and abi1-1 following dehydration. Together, these results reveal that OPDA can modulate gene expression via COI1 in a manner distinct from JA, and independently from ABA. Furthermore, the implication of the ABA pathway in co-regulating AtPHO1;H10 expression is dependent on the abiotic stress applied, being weak under wounding but strong upon dehydration.




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