All Sources -
Updated Media sources (1) About encyclopedia.com content Print Topic
aleurone layer The single layer of large cells under the bran coat and outside the endosperm of cereal grains. About 3% of the weight of the grain, and rich in protein, as well as containing about 20% of the vitamin B1, 30% of the vitamin B2 and 50% of the niacin of the grain. Botanically the aleurone layer is part of the endosperm, but in milling it remains attached to the inner layer of the bran. See also flour, extraction rate.
aleurone layer A layer of cells below the testa of some seeds (e.g. barley), which contains hydrolytic enzymes (including amylases and proteases) for the digestion of the food stored in the endosperm. The production of enzymes is activated by gibberellins when the seed is soaked in water prior to germination.
aleurone layer The outer layer of living cells of the endosperm of wheat and other grain species. It is a single layer of cells that synthesizes the enzyme α-amylase, which is secreted during germination into the starch-filled endosperm and breaks down the starch into maltose and glucose. Studies on the barley grain have shown that gibberellins control the synthesis of the enzyme by switching on the genes for the synthesis of the specific RNA that codes for the α-amylase protein.
More From encyclopedia.com
Cells , Cells Plants are multicellular organisms composed of millions of plant cells. Although individual cells may differ greatly from each other in mature… Cell Membrane , cell membrane (plasmalemma, plasma membrane, protoplast) A sheet-like membrane, 7.5–10 nm thick, that forms a selectively permeable barrier enclosing… Adherens Junction , adherens junction A cell junction that is commonly observed in epithelial (see EPITHELIUM) cells (e.g. those lining the intestine and those in cardia… Cell Death , Cell death Like all living things, the various types of cells in plants, animals, and the many different cell types in humans eventually die. Cell de… Schwann Cell , Schwann cell (neurilemma cell) A cell that forms the myelin sheath of a nerve fibre. Each cell is responsible for a single length of the fibre (calle… Golgi Apparatus , Golgi apparatus An assembly of vesicles and folded membranes within the cytoplasm of eukaryotic cells that modifies proteins and packages them and ot…
You Might Also Like