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Enter keyword(s) and/or category/ies. Selecting categories for a query makes a search more specific. For example, you can retrieve sentences that contain the word HSN and a
Oryza sativa
gene name by typing the keyword 'SPW1' and choosing the category 'gene (Oryza sativa)'. A category hit occurs when a particular word or phrase in the sentence is defined as a member of a particular category. Categories will be concatenated by a Boolean 'and' operation to other categories and keyword(s) if present. To search for terms in categories, click on the Categories/Ontology link above.
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Score:
3.00
Title:
Identification of the OsOPR7 gene encoding 12-oxophytodienoate reductase involved in the biosynthesis of jasmonic acid in rice .
Author:
Tani T Sobajima H Okada K Chujo T Arimura S Tsutsumi N Nishimura M Seto H Nojiri H Yamane H
Journal:
Planta
Citation:
V : 227 P : 517-26
Year:
2008
Type:
MEDLINE
Literature:
oryza
Field:
abstract
Doc ID:
pub17938955
Accession (PMID):
17938955
Abstract:
Enzyme 12-oxophytodienoate ( OPDA ) reductase ( EC1 . 3 . 1 . 42 ) , which is involved in the biosynthesis of jasmonic acid ( JA ) , catalyses the reduction of 10 , 11-double bonds of OPDA to yield 3-oxo-2- ( 2-pentenyl ) -cyclopentane-1-octanoic acid (
OPC-8
: 0 ) . The rice OsOPR1 gene encodes OPDA reductase ( OPR ) converting ( - ) -cis-OPDA preferentially , rather than ( + ) -cis-OPDA , a natural precursor of JA . Here , we provide evidence that an OPR family gene in rice chromosome 8 , designated OsOPR7 , encodes the enzyme involved in the JA biosynthesis . Recombinant OsOPR7-His protein efficiently catalysed the reduction of both enantiomers of cis-OPDA , similar to the
OPR3
protein in Arabidopsis thaliana ( L ) Heynh . The expression of OsOPR7 mRNA was induced and reached maximum levels within 0 . 5 h of mechanical wounding and drought stress , and the endogenous JA level started to increase in accordance with the increase in OsOPR7 expression . The GFP-OsOPR7 fusion protein was detected exclusively in peroxisomes in onion epidermal cells . Furthermore , complementation analysis using an Arabidopsis
opr3
mutant indicated that the OsOPR7 gene , but not OsOPR1 , was able to complement the phenotypes of male sterility in the mutant caused by JA deficiency , and that JA production in the
opr3
mutant was also restored by the expression of the OsOPR7 gene . We conclude that the OsOPR7 gene encodes the enzyme catalysing the reduction of natural ( + ) -cis-OPDA for the JA biosynthesis in rice .
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