Fig. 6From: A positive feedback regulatory loop, SA-AtNAP-SAG202/SARD1-ICS1-SA, in SA biosynthesis involved in leaf senescence but not defense responseLC-MS/MS analyses of free SA levels in WT, atnap, sag202, ics1 null mutants, AtNAPin and SAG202in lines. (a) Free SA levels in NS and S (~ 50% yellowing) leaves of WT, atnap, sag202 and ics1 mutants, respectively. (b) Free SA levels in young leaves of AtNAP inducible lines (AtNAPin) and SAG202 inducible lines (SAG202in) at 0, 1, 2, 4, and 7 days after DEX induction. Error bars indicate SD of three biological repeats. Significant (P < 0.05) differences between means are indicated by different letters using Tukey’s HSD testBack to article page