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primarystem213-page1 - The corpus meristem cells under the...

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The Shoot System: Primary Stem Structure - 1 Shoot System The shoot system comprises the leaves and stems of plants. Leaves are located at nodes on the stem; the distance along the stem between nodes is known as an internode. Shoots develop from shoot meristem, which contains the apical shoot tip meristem from the epicotyl of the embryo, leaf primordia, and bud primordia, which are embryonic lateral shoot systems. Flowers, the reproductive organs of angiosperms, are modified shoots. Shoot meristems are located at the growing tips of stems, and in buds. Shoot Meristems The apical meristem is divided into two regions: tunica and corpus. The tunica meristem cells divided in a plane the produces additional surface meristem.
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Unformatted text preview: The corpus meristem cells under the tunica divide in a plane that adds bulk to the shoot meristem. Generally there are two tunica layers and one corpus layer. As a shoot grows, buds are laid down by shoot meristem in the axils of leaf primordia. The repeating units of leaf and bud primordia are called phytomeres. These buds are dormant meristems that are activated at some later time in growth. Stem tissues are produced from the same three derivative meristems as root tissues are: Protoderm is responsible for Epidermis Ground Meristem differentiates into ground tissues Procambium produces the vascular tissues Coleus stem tip, l.s. Shoot tip, xs SEM of shoot tip...
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