Plants 7

Plants 7 - Plants 7 The typical primary shoot system...

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Plants 7 The typical primary shoot system consists of the node, internode, petiole, blade, and the axillary bud which becomes the branches. The flower and fruit are also associated with the primary plant body. All of these are produced as a result of the shoot apical meristem. Lets make a longitudinal section of the shoot apical meristem: The first thing we notice is that the shoot apical is a large bump. On either side of the bump are smaller bumps. As we go down, we see larger bumps. Finally, the last thing to add is we sometimes see dark bodies in the corners of these structures. In the shoot apical meristem, cell division is occurring. The biggest bump is the apical dome. Leaf primorida are the smaller bumps and they will develop into the new leaves. The somewhat larger bumps also represent leaf primordial. But they are older than the ones above it. The dots are axillary buds. The lines going down the shoot apical meristem represent the beginning of the vascular tissue=xylem and the phloem. They haven’t differentiated completely into xylem and phloem. They are pre-xylem/phloem they are called procambium and they WILL eventually differentiate into xylem and phloem. The outer edge is the epidermis, but since
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This note was uploaded on 02/04/2010 for the course BIO 1B taught by Professor Carlson,mischel,power during the Spring '07 term at Berkeley.

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Plants 7 - Plants 7 The typical primary shoot system...

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