cell death stage of secondary xylem

Term Information

Accession
PO:0025466
Aspect
plant structure development stage
Synonyms
exact: etapa de muerte celular del xilema secundario (Spanish)
exact: transition to heartwood stage
exact: 二次木部の細胞死段階 (Japanese)
Definition
A cell differentiation stage of secondary xylem (PO:0025469) that occurs during the interval between the first cell death of a tracheary element (PO:0000290) or non-septate xylem fiber cell (PO:0000274) and the death of the last secondary xylem parenchyma cell (PO:0004525) or septate fiber cell (PO:0004521) in a portion of secondary xylem (PO:0005848). [source: POC:wood_curators]
Comment
During this stage, the cells of a portion of secondary xylem are undergoing cell death (GO:0008219), sometimes called apoptosis. Death of the tracheary elements and non-septate xylem fiber cells generally precedes the death of secondary parenchyma cells and septate fiber cells. Once all cells in portion of secondary xylem are dead, it transitions from sapwood (PO:0004513) to heartwood (PO:0004512), and secondary xylem development ends.

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