Intracellular components associated with protein synthesis in developing wheat endosperm

Abstract

Almost all plant seeds accumulate storage proteins which are utilized by the developing embryo on germination. In wheat grain, the protein is formed predominantly in the endosperm tissue. Jennings & Morton (1963a, b) and Graham, Morton & Simmonds (1963a) have described the changes in the protein, carbohydrate, nucleic acids and other components during development of the endosperm of several varieties of wheat (Triticum spp.) grown under field conditions in South Australia. During development of the endosperm from about 10 days after flowering until maturity at about 40 days there is rapid synthesis of protein; in variety Dural, for example, the protein nitrogen increased from 54,tg./grain at day 12 to 558,ug./

In vitro synthesis of barley storage proteins

“…This hypothesis was supported by Miflin and 3hewry (1979b) for the formation of protein bodies_ A third hypothesis is that protein bodies are independent organelles, possibly of plastidal origin. However, an early suggestion, that protein bodies contain ribosomes of a lower sedimentation value than those of the cytoplasm (Morton et al 1964), has been contradicted by electron microscopic evidence.…”

Effects of Nitrogen Application on the Development and Accumulation of Protein Bodies in Developing Rice Seed

“…One type formed in the cytoplasm, was round, and bound by a double lipoprotein membrane, whereas the other type was irregular in shape and secreted into vacuole. However, protein bodies were also formed in the plastids called 'proteoplast' (Morton et al, 1964;Hoshikawa, 1970). Although, three types of protein bodies have been reported by Oparka and Harris ( 1982), all of these protein bodies were of the crystalline type formed in a ribosome-free dilated RER and developed by accumulation of protein from dictyosomederived vesicles.…”

Protein Bodies of the Soybean

“…It has been known for many years More recently there have been attempts to isolate these particles from wheat (7,10,13) from groundnut (1, 2) from pea (18) and from cotton seed (20) by using differential sedimentation in a variety of media. The reported composition always includes a predominance of protein, justifying the name of protein body.…”