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Electron microscopic observation of thin sections of rice (Oryza sativa L.) endosperm revealed two types of protein bodies (PBs): spherical and irregular-shaped ones. Immunocytochemical localization studies using antibodies raised against purified glutelins, prolamines, and globulins indicated that the prolamines were localized in the spherical PB, whereas the irregular-shaped PB contained glutelins and globulins. We counted and measured the surface area and the relative volume of 2303 PBs randomly selected from two different developmental stages and from different locations within the endosperm. The ratio of spherical to irregular-shaped PBs was 1:1.6. Double-label immunogold electron microscopic localization indicated that the globulins represented about 18% of the surface area of the irregular-shaped PBs. Based on our morphometric analysis, we estimate the relative contribution of glutelin as 53%, that of prolamine as 35%, and that of globulin as 12% of the total seed protein.

plant physiology

Morphometric Analysis of Rice Seed Protein Bodies (Implication for a Significant Contribution of Prolamine to the Total Protein Content of Rice Endosperm)