<P> The desmotubule is a tube of appressed (flattened) endoplasmic reticulum that runs between two adjacent cells . Some molecules are known to be transported through this channel, but it is not thought to be the main route for plasmodesmatal transport . </P> <P> Around the desmotubule and the plasma membrane areas of an electron dense material have been seen, often joined together by spoke - like structures that seem to split the plasmodesma into smaller channels . These structures may be composed of myosin and actin, which are part of the cell's cytoskeleton . If this is the case these proteins could be used in the selective transport of large molecules between the two cells . </P> <P> Plasmodesmata have been shown to transport proteins (including transcription factors), short interfering RNA, messenger RNA, viroids, and viral genomes from cell to cell . One example of a viral movement proteins is the tobacco mosaic virus MP - 30 . MP - 30 is thought to bind to the virus's own genome and shuttle it from infected cells to uninfected cells through plasmodesmata . Flowering Locus T protein moves from leaves to the shoot apical meristem through plasmodesmata to initiate flowering . </P> <P> Plasmodesmata are also used by cells in phloem, and symplastic transport is used to regulate the sieve - tube cells by the companion cells . </P>

Name three things that plant cells share by transporting them through the plasmodesmata
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