Formation and Distribution of Amylose and Amylopectin in the Starch Granule

Formation and Deposition of Amylose in the Potato Tuber Starch Granule Are Affected by the Reduction of Granule-Bound Starch Synthase Gene Expression

“…Reserve starch in potato tubers contains 18 to 23% amylose (Shannon and Garwood, 1984). The growth of starch granules occurs via apposition (Badenhuizen, 1963). The structure of starch granules is determined by the crystalline organization of the amylopectin molecules (Oostergetel and van Bruggen, 1989).…”

Histological and histochemical studies on the cotyledons of some legumes. II. Reserve metabolites during seed development.

“…This is demonstrated by many experiments done by Badenhuizen (1971) and Ohad et al (1971). The material present in the stroma of amyloplasts are responsible for the shape and size of starch grain, and stroma in turn is regulated by nucleus (Badenhuizen 1963) . A change in morphology of the strach grain occurs while development along with the change in amylose content (Banks and Greenwood 1973).…”

“…Amyloplast when examined with electron microscope appears to be a vesicle surrounded by a double membrane, with few, if any, membranous structure inside (Badenhuizen 1963). Also, the amyloplasts are dependent on an external supply of sugars for starch synthesis, in contrast to chloroplasts, which contain a photosynthetic apparatus.…”

“…There is now conclusive evidence that starch grains do not arise as a coacervate by rapid crystallization, but they grow over an extended period of time by apposition (Badenhuizen andDutton 1956, May andButtrose 1959) . Such a method of growth can explain the shell structure visible under light microscope in the form of concentric rings when stained with IKI reagent (present study).…”

“…The structure of starch grain has been reviewed by Badenhuizen (1956). Starch grains of potato tubers during all stages of development are surrounded by a membrane derived from the plastid envelope (Ohad et al 1971).…”