title: In vitro culture of microsporophylls and megagametophyte tissue of Pinus.
mesh_terms: D002454:Cell Differentiation; D002478:Cells, Cultured; D002875:Chromosomes / Q000648:ultrastructure; D046508:Culture Techniques; D006238:Haploidy; D008938:Mitosis; D009928:Organ Specificity; D059828:Plant Cells; D012639:Seeds; D013045:Species Specificity; D013997:Time Factors; D014197:Trees