Abstract
Leaf browning was induced at sites distant from the wounds in detached leaves in 6 species of Acanthaceae and 13 species of Gesneriaceae plants. This injury was observed in unwounded young leaves after their detachment from the mother plant, and sometimes in unwounded leaves on the wounded plant, e.g., when stem cuttings were made. The injury is restricted to one layer of palisade cells ; the response is rapid. Chlorophyll fluorescence intensity decreased irreversibly in an injured tissue within seconds at sites distant from the wound.
