SEPTIN3 and infection: Western blots performed using flowers collected from healthy and AY-WB–infected Arabidopsis lines expressing AP1–GFP or SEP3–GFP revealed that these MTFs appear to be less abundant in infected leaf-like flowers harvested at a late stage of infection (4+ wk postinoculation) (Figure 2A and Table S5), suggesting that phytoplasma may act to destabilize these transcription factors.