Starch grains development

Case 21.—Starch grains found in the tubercle of the potato, the growth of which was arrestod. The granules are seen forming two or more smaller corpuscles at the expense of the larger ones also the more developed... 

Eccen tric.—Deviating from the center. Applied to the hila of starch grains which are outside of the center, also to woody plants which develop more rapidly on one side than on the other. 

It was during the 19th century that Nageli developed a theory to deal with the birefiingent materials in plant cells and starch grains. This theory introduced the concept of crystalline micelles having submicroscopic dimensions. This, in turn, led to the proposal that crystalline micelles were separate, well-defined entities, stacked like bricks whose length coincided with the axis of the constituent cellulose molecules. In order to take account of the amorphous content of cellulose, the idea of... 

Fig. 9. (continued), (ob), a well-developed protein body (aleurone grain, ag), and starch grains (st) are present, (c) Thirty days after petal fall. Cell now packed with oil bodies (ob) as well as myrosin grains (mg), aleurone grains (ag), and starch grains (st). (Reproduced by permission of Mr. C. G. Smith and Springer Verlag from Smith, 1974.)... 

Describe the mechanisms for the formation of starch granules and protein bodies during grain development and maturation. 

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