Figure 4. TMTM contributes positively to root growth. Wild-type (A) or slim1 (B) seedling root growth on high sulfate medium (HS) or on low sulfate medium (LS) with addition of 0, 100 or 1000 μg TMTM was measured 7 days after application. Error bars represent SEs from at least 6 independent biological replicates for wildtype and 8 biological replicates for slim1 . Statistical significance was determined by Duncan’s multiple range test with p-vale < 0.05, and indicated with lower-case letters.