protophloem
Term Information
- Accession
- PO:0006077
- Aspect
- plant anatomy
- Synonyms
- exact: portion of protophloem tissue
- exact: protofloema (Spanish)
- exact: 原生師部 (Japanese)
- Definition
- A portion of primary phloem (PO:0006075) tissue has as parts the first-formed sieve elements (PO:0025406) at a particular location and does not have companion cells (PO:0000071, in angiosperms) or albuminous cells (PO:0025412, in gymnosperms) associated with the sieve elements. [source: ISBN:0471245194, POC:curators]
- Comment
- Protophloem is the first primary phloem to develop in any particular location in a portion of vascular tissue (PO:0009015). Sieve elements in the protophloem are smaller than in the metaphloem (PO:0006076). The protophloem usually only lasts a short time before it is replaced by metaphloem.
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