Morphology of the barley grain with reference to its enzym-secreting areas . di-narily protrude at the points of contact with the aleurone layer, butare even more narrow than the available space requires. In a veryfew types, as the Smyrna, this is not wholly true. While the most important factor of enzymatic production is thusseen to be the surface area of the secreting organ, there is still anadditional element. There may be a difference in the quality of thesecreting tissue. In other words, the epithelial layer varies withreference to the character of its cells. In some barleys it is made up
Morphology of the barley grain with reference to its enzym-secreting areas . di-narily protrude at the points of contact with the aleurone layer, butare even more narrow than the available space requires. In a veryfew types, as the Smyrna, this is not wholly true. While the most important factor of enzymatic production is thusseen to be the surface area of the secreting organ, there is still anadditional element. There may be a difference in the quality of thesecreting tissue. In other words, the epithelial layer varies withreference to the character of its cells. In some barleys it is made upof short, broad cells; in others the units are long and narrow. (See Bui. 183, U. S. Dept. of Agriculture. Plate V. Fig. 1 .—Photomicrograph of the Scutellum of a Germi-nating Grain with Its Epithelial Layer. In the ends of the cells of the epithelial layer (e) is to be seen theblack deposit, thought by Torrey to be diastase. In front of theepithelial layer the endosperm has been reduced to a milkysolution, while the scutellar cells back of it are obviously Fig. 2.—Two Grains of Finnish Barley. A grain of undesirable spindle shape and a small, insufficientscutellum. 1 83, U. S. Dept. of Agriculture. Plate VI.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashi, bookyear1915
