Clonal variation in pollen-related characteristics of Douglas-fir

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Abstract
The mean number of pollen grains produced per pollen cone (P) ranged from 37,310-62,690 among 8 seed-orchard clones of Douglas-fir (P. menziesii (Mirb.) Franco) and correlated significantly with the mean number of microsporophylls per cone but not significantly with pollen cone length. The number of pollen grains per milligram (G) also differed among clones (range 2323-3112) and correlated significantly and negatively with grain diameter. Although this provides evidence for genetic variation in P and G, the differences were relatively small. Adjusting pollen-cone counts for P would add little, if any, precision to estimates of pollen production in seed-orchard clones. If balanced clonal representation in pollen mixes is desired, equal weights of pollen would probably suffice for most breeding applications.

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