part_of
part of
heartwood
Heartwood has ceased to function in storage and conduction, and the reserve materials have been removed or converted into heartwood substances. It is generally darker colored than sapwood (PO:0004513) and is found in the center of a shoot axis (PO:0025029) or root (PO:0009005), interior to the sapwood. Heartwood forms at the end of a cell death stage of secondary xylem (PO:0025466).
心材 (Japanese, exact)
A portion of secondary xylem (PO:0005848) that lacks living secondary xylem parenchyma cells (PO:0004525).
plant_anatomy
PO:0004512
duramen (Spanish, exact)
secondary xylem
plant axis