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Futile plasma membrane cycling of ammonium (NH 4 + ) is characteristic of low-affinity NH 4 + transport, and has been proposed to be a critical factor in NH 4 + toxicity. Using unidirectional flux analysis with the positron-emitting tracer 13 N in intact seedlings of barley ( Hordeum vulgare L.),...
The shoot apical meristem generates stem, leaves, and lateral shoot meristems during the entire shoot ontogeny. Vegetative leaves are generated by the meristem in the vegetative developmental phase, while in the reproductive phase either bracts subtending lateral flower primordia (or paraclades),...