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    Home > Biochemistry News > Plant Extracts News > The structure of the sunflower stem

    The structure of the sunflower stem

    • Last Update: 2021-01-06
    • Source: Internet
    • Author: User
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    the structure of sunflower stems
    (i) the primary structure of sunflower stems take the stems of sunflower seedlings near the top part, and make a
    slice with
    . The slices are stained with sub-methyl blue or neutral red, and then observed under a
    scope
    , and the cross-cutting surface of the sunflower's young stems can be seen divided into three parts: the skin, the cortical layer, and the column.the skin is developed from the original cortical layer, for a layer of tightly arranged, shape rules, the outer wall has the protection of the layer
    tissue
    cells, the surface cortical layer also has pores and skin hair.cortical layer is developed from basic sub-living tissue, and the cells are characterized similar to the cortical cells of the root, but the proportion of the cortical layer in the stem is significantly less than in the root. The outermost part of the cortical layer has a bunch of thick-angled tissue that enhances the support capacity of the larvae. The innermost layer of cells in the cortical layer is often rich in starch grains, which can be dyed blue with a solution of potassium iodine-iodide, which is called starchy.column consists of a tube beam, myelin, and myelin rays. The tube bundles are arranged in a circle on the inside of the cortical layer and are composite tissues. Its exterior is the primary ligament, the interior is the primary wood part, between the ligament and the wood part there are several layers of neatly arranged and tight cells are formed in the bundle layer. The composition of the primary wood and the primary ligament is the same as that of the root. The difference between stem and root is that the primary wood part of the stem develops in the inner form, the primary wood part is located in the innermost part of the wood, and the primary wood part of the root is the outer beginning.is located in the middle of the stem and is developed from basic living tissue, mostly thin-walled cells with cell gaps.thin-walled tissue between adjacent tube bundles is myelin rays, which connect the cortical layer to myelin, making thin-walled tissue an intertecting system.observation of the above structure, two slices were taken to stain the potassium iodide-potassium iodide solution and the interphenol solution respectively. It is then observed separately under a microscope. On the slice of the potassium iodized solution, blue particles can be seen in the innermost cells of the cortical layer, which are starchy crucibles. Phenol, on the other hand, dyes the thickened and woody walls of catheter molecules and fibroblasts pink., take a permanent slice of the sunflower's young stem cross-cut surface and make a detailed observation against the freehand slice under a microscope.(ii) the secondary structure of sunflower stems take permanent slices of the cross-cutting surface of sunflower stems in different developmental periods, and observe the process of formation of secondary structures.The formation of theformation layer When the primary formation layer develops into a primary cytostic tube bundle in the initial growth, the next layer of the primary formation layer cells is retained between the primary wood and the primary ligament, they do not differentiate, always maintain the ability to divide, and then become part of the formation layer - the formation layer in the bundle.
    When secondary growth begins, myelin-ray cells, which are equivalent to the formation of layers in the beam, regain their ability to separate into separate tissues, which form another part of the formation layer, the inter-beam formation layer. At this point, the formation layer in the beam and the formation layer between the bundles are connected to each other, and a complete circle of formation layers appears in the stem.
    the microscope, several layers of radially arranged, flat-shaped cells between the woody and ligaments are the formation layers. Think about how many layers of cells you see instead of one? After that, the cells that form the layer of primitive cell division are internally differentiated into secondary woody parts and outwardly differentiated into secondary ligaments.
    note that the cells in the woody part that are dyed red and have larger diameters are catheters or tube cells, and that some of the smaller, polygonal thick-walled cells are fibers. The ligament is composed of sieve tubes, companion cells, ligament fibers and thin-walled cells of the ligament. A small bunch of cells on the outside of the tube bundle with thick cell walls and dyed red are ligament fibers, which
    organic
    support. Cells have larger diameters, and the thin walls of the cells are dyed green by sieve tubes;。
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