Protein Body Inclusions in Developing Wheat Endosperm

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Abstract
Endosperm tissue of two wheat cultivars, Maris Freeman and Mardler was examined by light and electron microscopy from early stages of development until maturity. Spherical electron-dense inclusions were first seen embedded in the periphery of endosperm protein bodies of both cultivars 11 days after anthesis. The inclusions, which gave a positive histochemical reaction for both protein and lipid, persisted throughout endosperm development and were present in the protein matrix of mature grain. Two types of membranous inclusions were found. In Maris Freeman and Mardler, vesicles and myelin whorls were associated with the surface of the protein mass during development and maturation. In Maris Freeman, membrane lattices of branched tubules with a basic cubic repeat unit of 44.8 nm were found in close contact with the protein mass, but these were not present in mature grain.

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