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The paper reviews female gametophyte development in vitro, the pathways of gynogenetic embryogeny, and autonomous endosperm development in vitro, and presents some implications for future investigation of apomictic processes. In most species studied so far, the pattern of embryo sac development was not altered by in vitro conditions, and some rare deviations could be additional sources of gynogenetic...
Changes in metal-resistance following pre-exposure to sub-lethal concentrations of Zn or Ni are reported in sycamore (Acer pseudoplatanus L.) callus cell lines established from shoot explants of mature trees. A cell line derived from a site contaminated primarily by Cu, Cd and Zn possessed a higher resistance to Zn and Ni than did a cell line from an uncontaminated site. Repeated subculturing of...
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