Editing Plant cell (section)

===Phloem===
[[Phloem]] is a specialised tissue for food transport in higher plants, mainly transporting [[sucrose]] along pressure gradients generated by osmosis, a process called [[Phloem#Function|translocation]]. Phloem is a complex tissue, consisting of two main cell types, the [[sieve tube element|sieve tubes]] and the intimately associated [[companion cell]]s, together with parenchyma cells, phloem fibres and sclereids.<ref name=Cutter/>{{rp|171}} Sieve tubes are joined end-to-end with perforated end-plates between known as ''[[sieve plate]]s'', which allow transport of photosynthate between the sieve elements. The sieve tube elements lack [[cell nucleus|nuclei]] and [[ribosome]]s, and their metabolism and functions are regulated by the adjacent nucleate companion cells. The companion cells, connected to the sieve tubes via [[plasmodesmata]], are responsible for loading the phloem with [[sugar]]s. The [[bryophyte]]s lack phloem, but [[moss]] [[sporophyte]]s have a simpler tissue with analogous function known as the leptome.

[[File:Epidermal Cells of Plant Leaf..jpg|thumb|This is an electron micrograph of the epidermal cells of a Brassica chinensis leaf. The stomates are also visible.]]