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. 2008 Mar;3(3):166–174. doi: 10.4161/psb.3.3.5538

Figure 1.

Figure 1

Proposed pathways for salicylic acid biosynthesis and signaling in ozone-exposed plants. There are two pathways for salicylic acid (SA) biosynthesis in plants. Arabidopsis mutant sid2, that have a defect in ICS, does not accumulate salicylic acid (SA) in response to ozone, implying that SA is synthesized from isochorismate pathway (down from Chorismate) in Arabidopsis. However, another evidences support synthesis of SA from phenylalanine (PAL) pathway (right from Chorismate) in plants except for Arabidopsis. Final product (SA) of this pathway inhibits ICS expression and/or ICS activity. NPR; nonexpressor of PR-1.