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Accumulation of SA and 4HBA in phloem exudates after excision of leaves. Levels of SA and 4HBA in stem phloem exudate were determined 20 h after infiltration of one leaf on each plant with water (C) or P. syringae cells (I). Plants were either left intact (+Leaves), or had all leaves excised 6 h after inoculation (−Leaves). ses are indicated.
