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Effect of SA interactions with JA on PDF1.2 and PR1 transcript accumulation in Arabidopsis npr1-1 and coi1-1. PR1 and PDF1.2 transcription in explants (the central inner 0.5-cm diameter core of a 1-cm disc) from Arabidopsis wild-type Col-0, npr1-1, and coi1-1 in untreated controls and at 12 h following treatment with 50 μm JA and 50 μm SA, either alone or in combination. The ethidium bromide-stained gel showing ribosomal RNA (rRNA) is presented to demonstrate equal loading.
