has_participant has participant has participant secondary xylem xylem development stage secondary xylem development stage PO:0025427 PO_GIT:447 rwalls plant_structure_development_stage During a secondary xylem development stage (also called a wood development stage), the cells of secondary xylem (PO:0005848), including tracheary elements (PO:0000290), xylem fiber cells (PO:0000274), and wood parenchyma cells (PO:0004525) undergo cellular developmental processes (GO:0048869) such as cell division (GO:0051301), cell growth (GO:0016049), cell differentiation (GO:0030154), or cell death (GO:0008219). The transition from sapwood to heartwood marks the end of the secondary xylem development stage. 二次木質部発生過程 (Japanese, exact) 2012-02-04T09:25:25Z wood development stage (exact) A xylem development stage (PO:0025425) that has as primary participant a portion of secondary xylem (PO:0005848) tissue during the interval between the beginning of a cell division stage of secondary xylem (PO:0025463) and the death of the last living cell in the secondary xylem. etapa de desarrollo del xilema secundario (Spanish, exact) sapwood development stage (exact)