Pollen contamination trends in a maturing Douglas-fir seed orchard 1

  title={Pollen contamination trends in a maturing Douglas-fir seed orchard 1},
  author={William T. Adams and Valerie D. Hipkins and Jarosław Burczyk and Walter Randall},
Pollen contamination was investigated in one block (block 4) of a 10-block Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seed orchard complex in western Oregon. Blocks (25 clones each) represent different breeding zones; thus, contaminant pollen sources not only included the adjacent natural stand of Douglas-fir, but also other blocks within the orchard complex. Stored seed lots from five crop years (i.e., 1982, 1985, 1987, 1989, 1990) were sampled (200 seeds each) and assayed at 11… CONTINUE READING
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