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| Title: Salicylic Acid in Rice ( Biosynthesis , Conjugation , and Possible Role ) .
| | Author: Silverman P Seskar M Kanter D Schweizer P Metraux JP Raskin I | | Journal: Citation: V : 108 ( 2 ) P : 633-639 Year: 1995 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub12228500 Accession (PMID): 12228500 | | Abstract: Salicylic acid ( SA ) is a natural inducer of disease resistance in some dicotyledonous plants .
Rice seedlings ( Oryza sativa L ) had the highest levels of SA among all plants tested for SA content ( between 0 . 01 and 37 . 19 [ mu ] g/g fresh weight ) .
The second leaf of rice seedlings had slightly lower SA levels than any younger leaves .
To investigate the role of SA in rice disease resistance , we examined the levels of SA in rice ( cv M-201 ) after inoculation with bacterial and fungal pathogens .
SA levels did not increase after inoculation with either the avirulent pathogen Pseudomonas syringae D20 or with the rice pathogens Magnaporthe grisea , the causal agent of rice blast , and Rhizoctonia solani , the causal agent of sheath blight .
However , leaf SA levels in 28 rice varieties showed a correlation with generalized blast resistance , indicating that SA may play a role as a constitutive defense compound .
Biosynthesis and metabolism of SA in rice was studied and compared to that of tobacco Rice shoots converted [ 14C ] cinnamic acid to SA and the lignin precursors p-coumaric and ferulic acids , whereas [ 14C ] benzoic acid was readily converted to SA .
The data suggest that in rice , as in tobacco , SA is synthesized from cinnamic acid via benzoic acid .
In rice shoots , SA is largely present as a free acid ; however , exogenously supplied SA was converted to [ beta ] -O-D-glucosylSA by an SA-inducible glucosyltransferase ( SA-GTase ) .
A 7-fold induction of SA-GTase activity was observed after 6 h of feeding 1 mM SA .
Both rice roots and shoots showed similar patterns of SA-GTase induction by SA , with maximal induction after feeding with 1 mM SA . | Matching Sentences:
[ Sen. 5, subscore: 1.00 ]: SA levels did not increase after inoculation with either the avirulent pathogen Pseudomonas syringae D20 or with the rice pathogens Magnaporthe grisea , the causal agent of rice blast , and Rhizoctonia solani , the causal agent of sheath blight .
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