EEB340H1 Lecture 7: EEB340 - Lecture 7.docx

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Phloem tissue: contains cells that conduct food food conducting tissue: sieve tube elements in flowering plants (more derives) liverworts and mosses have some water conducting cells so could be considered. Phloem tissue: sieve cells gymnosperms and onward (basal) Companion cell is not developmentally related to the sieve cell shoot and root apical meristems are responsible for vertical growth. Xylem cells have fiber and are lignified so give plants a lot of support cork cambium gives rise to the bark: as divides, gives rise to cork cells and fibers. No ribosome"s no protein synthesis (also because no nucleus) No vacuole (would interfere with rapid movement of food: there is an interdependence of the sieve tube element on the companion cell. Protostele: central core of water and food conducting tissues. Some along or under ground: no leaves, small (2 meters in height max) Vascular cambium produced xylem towards inside, phloem towards outside.

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