In lab on Thursday February 16th we explored root structures of monocot and dicot roots. Our class examined a Corn plant to identify parts of the root. Monocot roots have adventitious roots where lateral roots give rise to fibrous roots. These type of roots do not have a primary root, but instead have many that branch out from the stem. Although the structure of the monocot and dicots are different, they still encompass the same internal anatomy. The image below on the left shows a picture of a Corn plant root through a microscope. The cross-section was stained with TBO and the microscope magnification is at 40x. The image on the right is a drawing of a monocot root with its labeled parts. The third image is another example of a monocot root structure. The epidermis layer of cells is found the outermost edge of the root and is the same for both monocot and dicot roots. In from the epidermis is the exodermis layer of cells (not labeled in on the image). Next is the cortex, which is made up of all the cells between the exodermis and the endodermis. The endodermis is the first, outermost layer of dark cells. The next layer of dark cells in known as the pericycle. The the larger bubble looking circles are the xylem cells. Surrounding the xylem cells are the phloem cells. The pith is the innermost cells from the xylem cells. Lastly, the stele is the area inside the endodermis cells.
By Keira Mitchell Comments are closed.
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AuthorContent is created by students participating in the Plant Structure course at Oregon State University for Winter 2017. Archives
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