Autotoxic Feedback in Relatin to Germination and Seedling Growth in Typha Latifolia

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Abstract
Seed germination of Typha latifolia was completely inhibited by an aqueous extract of cattail leaves but was only partially inhibited by extract treated with polyclar AT to remove phenolic compounds. Seedling growth was slightly inhibited by water from cattail marshes, was highly inhibited by water squeezed from soil in which cattails were growing, and was stimulated (as compared with the distilled water control) by water obtained from a Sphagnum bog. Cattail populations, once established, may this effectively preclude invasion by alien typha genotypes, and the autotoxic properties of the accumulated organic residues may accentuate the unidirectional orientation of marsh succession.