Abstract
Summary Protein body ontogeny and the synthesis and accumulation of the major storage proteins of pea seeds are reviewed. Fragmentation of the large central vacuole present early in cotyledon development gives rise to most, if not all, of the protein bodies present in the mature seed. The globulin storage proteins are cotranslationally sequestered within the endoplasmic reticulum, followed by passage to the Golgi membrane system, where at least some of the proteins undergo glycan processing. Transport to the storage sites, the vacuoles and protein bodies, is via Golgi-derived vesicles. Late in seed development, small dense bodies surrounded by ribosomes are present and these are shown here to contain only an albumin storage protein. The role of the Golgi apparatus in storage albumin accumulation is unclear. The possibility of variations on this general pathway of protein accumulation is considered.
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