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Studies on the relation of bran thickness to millability of some Pacific Northwest wheats


, : Studies on the relation of bran thickness to millability of some Pacific Northwest wheats. Cereal Chem 28(4): 247-258

Thickness of the bran layers, viz., outer pericarp, cross and tube cell layer, spermoderm, nucellar layer, and aleurone layer of 7 wheat vars. from the Pacific Northwest was detd. microscopically in an effort to obtain data that might be correlated with the general milling behavior of the wheats. The outer pericarp was found to be thickest toward the brush end, and approx. uniform in thickness over the rest of the kernel. Pericarp thickness varied among kernels of the same var. Significant differences between vars. were not clearly shown. The cross and tube cell layer was thickest over the dorsal side of the kernel; over the rest of the kernel the tube cells were either crushed or absorbed. The difference in thickness of the cross and tube cell layer between vars. was significant. Significant differences in thickness of the spermoderm were found between vars. and between regions of the kernel. The spermoderm was thickest in the cheeks and gradually became thinner toward the dorsal side; while along the long axis it was thicker at the brush end and gradually became thinner toward the germ. In transections the nucellar layer was thickest on the cheeks and in longisections it was thickest at the brush end. Significant differences between varieties and between regions were found. The thickness of the aleurone layer varied significantly between vars. Less difference in thickness of adjacent aleurone cells was found in good-milling than in poor-milling vars. There was no conclusive evidence that this is a major factor affecting milling quality. The thickness of the layers of the bran was not directly related to the general milling behavior of the wheat vars. studied.

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