Leaves213-page6 - may be uniform in size and distribution...

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Leaves - 6 Vein Patterns As discussed, in eudicots veins form a network throughout the mesophyll, branching from the midvein. In a leaf cross section, the large midvein is conspicuous, with bundle sheath extensions that often go from the upper epidermis to the lower epidermis providing additional support. There may be some secondary growth in the midvein. Branching veins may be seen either in cross section or in longitudinal or even oblique sections of leaves. Branching veins may also have bundle sheath extensions. In a monocot leaf cross section, the parallel veins are seen in cross section and
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Unformatted text preview: may be uniform in size and distribution across the leaf's interior. Some grasses may have large thin-walled cells along both sides of the midvein in the upper epidermis. These cells, called bulliform cells, help the leaf to fold or roll inward during water deficit periods. Folding of the leaf minimizes evaporation. In addition, many monocots have enlarged bundle sheath cells, surrounding the veins, which have a function in C-4 photosynthesis for some plants. Bundle Sheath Cells in Sugar Cane and in Corn leaves...
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This note was uploaded on 01/08/2012 for the course BIO 213 taught by Professor Makina during the Fall '09 term at SUNY Stony Brook.

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